Weld strength evaluation method, device, computer equipment and storage medium
By acquiring finite element analysis data and combining it with weld throat size or penetration depth to calculate weld stress, the problem of inaccurate assessment in traditional evaluation methods is solved, and more accurate weld strength assessment is achieved.
Patent Information
- Application Number
- CN202210629657.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-06-06
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2042-06-06
AI Technical Summary
Traditional manual verification is difficult to accurately obtain the bending moment, torque, and force values and directions of the weld. The finite element verification has poor accuracy, resulting in inaccurate weld strength assessment.
By obtaining finite element analysis data and combining it with the throat size of fillet welds or the penetration depth of incomplete penetration groove welds, the first normal stress, the second normal stress, and the shear stress borne by the weld are calculated, and the strength of the weld is comprehensively evaluated to determine whether it is up to standard.
This improves the accuracy and objectivity of weld strength assessment, prevents weld cracking due to strength issues, and makes the results more consistent with the actual structure and stress state.
Smart Images
Figure CN115221749B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of welding, in particular to a welded seam strength evaluation method and device, computer equipment and a storage medium. BACKGROUND
[0002] A welded seam is a seam formed by melting and connecting the metal at the joint and the electrode by using the high temperature of a welding heat source, and the welded seam metal connects two welded parts into a whole after cooling. According to the shape of the welded seam metal and the mutual position of the welded parts, the welded seam can be divided into a groove welded seam, a fillet welded seam and the like.
[0003] Welded seam checking usually includes manual checking and finite element checking. When facing a welded structure of an airplane, a train or a car, it is difficult to obtain the numerical value and direction of the bending moment, the torque and the force by using the traditional manual checking, so that manual calculation cannot be performed. Therefore, in actual application, the finite element checking is usually used, and the finite element checking mainly checks whether the principal stress of the node corresponding to the welded seam exceeds the allowable stress of the welded seam / heat affected zone, so as to judge whether the strength of the welded seam is qualified. The evaluation result of the finite element checking has poor accuracy, and the inventor has found in practice that the strength of the welded seam is unqualified in the case of judging that the strength of the welded seam is qualified by using the finite element checking. SUMMARY
[0004] In order to solve one of the above technical problems, the present application provides a welded seam strength evaluation method, device, computer equipment and storage medium, and the technical solution is as follows:
[0005] According to a first aspect of the present application, a welded seam strength evaluation method is provided, and the method comprises the following steps:
[0006] obtaining finite element analysis data of a to-be-evaluated welded seam; wherein the finite element analysis data comprises the stress of the base material corresponding to the to-be-evaluated welded seam, and the to-be-evaluated welded seam comprises a fillet welded seam or an incomplete penetration groove welded seam;
[0007] calculating the first normal stress borne by the to-be-evaluated welded seam, the second normal stress borne by the to-be-evaluated welded seam due to the bending moment, and the shear stress borne by the to-be-evaluated welded seam based on the stress of the corresponding base material and the throat size of the fillet welded seam or the penetration depth of the incomplete penetration groove welded seam;
[0008] evaluating whether the strength of the fillet welded seam or the incomplete penetration groove welded seam is qualified based on the first normal stress, the second normal stress and the shear stress.
[0009] According to a second aspect of the present application, a welded seam strength evaluation device is provided, and the device comprises the following:
[0010] The acquisition module is configured to acquire finite element analysis data for a weld to be evaluated, wherein the finite element analysis data comprises stress of corresponding base material of the weld to be evaluated, and the weld to be evaluated comprises a fillet weld or an underbead groove weld.
[0011] The calculation module is configured to calculate, based on the stress of the corresponding base material and a throat size of the fillet weld or a penetration of the underbead groove weld, a first normal stress borne by the weld to be evaluated, a second normal stress borne by the weld to be evaluated due to a bending moment, and a shear stress borne by the weld to be evaluated.
[0012] The evaluation module is configured to evaluate, based on the first normal stress, the second normal stress, and the shear stress, whether the strength of the fillet weld or the underbead groove weld is qualified.
[0013] According to a third aspect of the embodiments of the present application, a computer device is provided, comprising:
[0014] a memory, a processor, and a computer program, wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method described above.
[0015] According to a fourth aspect of the embodiments of the present application, a computer readable storage medium is provided, which stores a computer program; the computer program is executed by a processor to implement the method described above.
[0016] The weld strength evaluation method provided in the embodiments of the present application considers the throat size of the fillet weld or the penetration of the underbead groove weld when evaluating the strength of the fillet weld or the underbead groove weld, and comprehensively considers the first normal stress, the shear stress, and the second normal stress borne due to the bending moment, which is more consistent with the actual structure and stress state of the weld, so that the result of the fillet weld or the underbead groove weld is more accurate. BRIEF DESCRIPTION OF DRAWINGS
[0017] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application and illustrate the illustrative embodiments of the present application and its description, which serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:
[0018] Figure 1 A flowchart of the weld strength evaluation method provided in the embodiments of the present application;
[0019] Figure 2 A structural schematic diagram of a fillet weld;
[0020] Figure 3 A structural schematic diagram of an underbead groove weld;
[0021] Figure 4 A structural schematic diagram of an underbead groove weld; Figure 1The flow chart of step S103;
[0022] Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0023] Figure 6 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure; Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0024] Figure 7 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure; Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0025] Figure 8 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure; Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0026] Figure 9 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure; Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0027] Figure 10 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure; Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0028] Figure 11 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure; Figure 5 The structural block diagram of the weld strength evaluation device provided in the embodiment of the present application is shown in the figure;
[0029] Figure 12 The principle block diagram of the computer device provided in the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION
[0030] In order to make the technical solutions and advantages in the embodiments of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0031] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.
[0032] In the process of implementing the present application, the inventors found that when evaluating the strength of the weld, traditional manual checking is usually difficult to achieve, and the theoretical results of finite element checking are quite different from the actual results, resulting in inaccurate evaluation when checking the weld.
[0033] Embodiment 1
[0034] To solve the above problems, the present application provides a weld strength evaluation method, Figure 1 The weld strength evaluation method provided in the embodiments of the present application, Figure 1 is a flowchart illustrating the process of evaluating the strength of fillet welds or incomplete penetration groove welds using finite element analysis data, throat size of fillet welds or penetration of incomplete penetration groove welds according to some embodiments of the present application. Although the processes described below include a plurality of operations appearing in a particular order, it should be clearly understood that these processes can include more or fewer operations, which can be executed sequentially or in parallel (for example, using parallel processors or multi-threaded environments). As shown in Figure 1 The method can include the following steps (S101-S103):
[0035] S101, acquiring finite element analysis data for the weld to be evaluated.
[0036] Before performing finite element analysis on the weld to be evaluated, a 3D model of the weld needs to be created. The mid-surface of the 3D model can be extracted and converted into a finite element model. The parts in the finite element model can be T-joints, lap joints, and butt joints. For a T-joint, the two parts are in contact during splicing, with no gap. Shell elements can be used when meshing the two parts, and the gap does not need to be modeled separately; the intersection of the two parts is considered the weld. For a lap joint, the two parts are not in contact during splicing, thus creating a gap. Shell elements can be used to simulate the weld connecting the two parts, and shell elements can be used when meshing the two parts. For a butt joint, the two parts are in contact during splicing, with no gap. Shell elements can be used when meshing the two parts, and the gap does not need to be modeled separately; the intersection of the two parts is considered the weld.
[0037] The weld to be evaluated can be a fillet weld or an incomplete penetration bevel weld (in this field, bevel welds are also called butt welds). Incomplete penetration refers to the phenomenon that the base metal is not completely melted and the weld metal does not enter the root of the joint. The bevel type of the bevel weld can include I-bevel, V-bevel, HV-bevel, Y-bevel, HY-bevel, U-bevel and J-bevel. Figure 2 This is a structural diagram of a fillet weld. Figure 3 This is a structural diagram of an incompletely penetrated groove weld. (Example:) Figure 2 and Figure 3 As shown, Figure 2 Two examples of fillet welds are shown: the first fillet weld 101 is a double-sided weld, and the second fillet weld 102 is a single-sided weld. Figure 3 Two examples of incomplete penetration groove welds are shown: the first incomplete penetration groove weld 201 is a double-sided weld, and the second incomplete penetration groove weld 202 is a single-sided weld.
[0038] After establishing a finite element model of the weld to be evaluated, finite element analysis can be performed using the model to obtain finite element analysis data. This data may include the stress in the base material corresponding to the weld being evaluated. In the finite element analysis, the stress in the base material corresponding to the weld being evaluated may include multiple stresses, for example, up to 12 different stresses.
[0039] S102. Based on the stress of the corresponding base material and the throat size of the fillet weld or the penetration depth of the incomplete weld groove, calculate the first normal stress borne by the weld to be evaluated, the second normal stress borne by the weld to be evaluated due to bending moment, and the shear stress borne by the weld to be evaluated.
[0040] In the cross-section of a fillet weld, a perpendicular line is drawn from the weld root to the line connecting the two weld toes. The length of this perpendicular line is the throat dimension of the fillet weld. The penetration depth of an incomplete penetration groove weld refers to the distance between the deepest point of the molten base metal and the surface of the base metal. See also... Figure 2The first throat size 1011 of the first fillet weld 101 and the second throat size 1021 of the second fillet weld 102 are shown as Figure 3 The first penetration 2011 of the first incomplete penetration groove weld 201 and the second penetration 2021 of the second incomplete penetration groove weld 202 are shown.
[0041] The first normal stress, the second normal stress and the shear stress borne by the fillet weld can be calculated based on the stress of the base material corresponding to the fillet weld and the throat size of the fillet weld, and the first normal stress, the second normal stress and the shear stress borne by the incomplete penetration groove weld can be calculated based on the stress of the base material corresponding to the incomplete penetration groove weld and the penetration of the incomplete penetration groove weld.
[0042] S103, based on the first normal stress, the second normal stress and the shear stress, evaluating whether the strength of the fillet weld or the incomplete penetration groove weld is qualified.
[0043] When the weld to be evaluated is a fillet weld or an incomplete penetration groove weld, the first normal stress, the second normal stress and the shear stress all take into account the throat size or the penetration, and the second normal stress takes into account the influence of the bending moment, and the shear stress takes into account the influence of the shear force. Compared with only considering the principal stress of the node corresponding to the weld, the strength of the fillet weld or the incomplete penetration groove weld is comprehensively evaluated by combining the first normal stress, the second normal stress and the shear stress, and the result is more accurate and objective, and more consistent with the actual strength of the weld, preventing the weld from cracking due to strength problems.
[0044] In summary, the first normal stress, the shear stress and the second normal stress borne by the fillet weld or the incomplete penetration groove weld are calculated by using the stress of the base material corresponding to the weld to be evaluated, combining the throat size of the fillet weld or the penetration of the incomplete penetration groove weld. Then, based on the first normal stress, the shear stress and the second normal stress borne by the bending moment, the strength of the fillet weld or the incomplete penetration groove weld is comprehensively evaluated to determine whether it is qualified, which can make the result more accurate and objective, and the calculated strength more consistent with the actual strength of the weld.
[0045] After performing finite element modeling on the weld to be evaluated, a three-dimensional coordinate system can be established with the weld length direction as the X direction, the shell element normal direction as the Y direction, and the weld normal stress direction (i.e., perpendicular to the weld length direction and the shell element normal direction) as the Z direction. The stresses in the base material corresponding to the weld to be evaluated can include: X-direction stress at the top of the shell element, X-direction stress at the bottom of the shell element, Y-direction stress at the top of the shell element, Y-direction stress at the bottom of the shell element, Z-direction normal stress at the top of the shell element, Z-direction stress at the bottom of the shell element, XY-plane shear stress at the top of the shell element, XY-plane shear stress at the bottom of the shell element, YZ-plane shear stress at the top of the shell element, YZ-plane shear stress at the bottom of the shell element, XZ-plane shear stress at the top of the shell element, and XZ-plane shear stress at the bottom of the shell element. The Y-direction stress at the top of the shell element, the Y-direction stress at the bottom of the shell element, the XY-plane shear stress at the top of the shell element, and the XY-plane shear stress at the bottom of the shell element are typically zero.
[0046] In one or more embodiments, the first normal stress borne by the fillet weld can be calculated using the Z-direction normal stress of the top layer of the shell element and the Z-direction normal stress of the bottom layer of the shell element, which may include the following steps (S201~S203):
[0047] S201. Determine the thinner base material corresponding to the fillet weld.
[0048] Base material refers to the sheet metal being welded during welding, such as... Figure 2 The first plate 1012, the second plate 1013, the third plate 1022, and the fourth plate 1023 shown are all base materials. The thicknesses of the welded base materials may be unequal or equal. If the thicknesses of the welded base materials are unequal, the thinner base material is determined; if the thicknesses of the welded base materials are equal, any base material can be determined. For example, if the thicknesses of the first plate 1012 and the second plate 1013 are unequal, then the thinner base material is determined to be the first plate 1012; if the thicknesses of the third plate 1022 and the fourth plate 1023 are unequal, then the thinner base material is determined to be the third plate 1022.
[0049] S202, Obtain the first plate thickness of the thinner base material.
[0050] For example, such as Figure 2 As shown, the base material corresponding to the first fillet weld 101 is the first plate 1012, which is thinner, so the thickness of the first plate 1012 is obtained; the base material corresponding to the second fillet weld 102 is the third plate 1022, which is thinner, so the thickness of the third plate 1022 is obtained.
[0051] S203. Based on the Z-direction normal stress of the top layer of the shell element, the Z-direction normal stress of the bottom layer of the shell element, the first plate thickness, and the weld throat size, calculate the first normal stress borne by the fillet weld.
[0052] In the finite element model of the fillet weld, the stress of the shell element corresponds to the stress of the base metal, and the load borne by the base metal and the load borne by the weld are forces of equal magnitude and opposite direction. The load borne by the base metal per unit length can be calculated by using the top layer Z-direction normal stress of the shell element, the bottom layer Z-direction normal stress of the shell element and the first plate thickness, and the first normal stress borne by the fillet weld can be calculated by using the load borne by the base metal and the throat size of the fillet weld. The throat size of the fillet weld is considered in the first normal stress, so as to increase the evaluation accuracy of the strength of the fillet weld.
[0053] The first normal stress borne by the incomplete penetration groove weld can be calculated by using the top layer Z-direction normal stress of the shell element and the bottom layer Z-direction normal stress of the shell element, and the following steps (S301-S302) can be included:
[0054] S301. Obtain the second plate thickness of the whole base metal corresponding to the incomplete penetration groove weld.
[0055] After the incomplete penetration groove weld is formed, the two base metals form a whole.
[0056] S302. Calculate the first normal stress borne by the incomplete penetration groove weld based on the top layer Z-direction normal stress of the shell element, the bottom layer Z-direction normal stress of the shell element, the second plate thickness and the penetration depth.
[0057] In the finite element model of the incomplete penetration groove weld, the stress of the shell element corresponds to the stress of the whole base metal, and the load borne by the whole base metal and the load borne by the weld are forces of equal magnitude and opposite direction. The load borne by the whole base metal per unit length can be calculated by using the top layer Z-direction normal stress of the shell element, the bottom layer Z-direction normal stress of the shell element and the second plate thickness, and the first normal stress borne by the incomplete penetration groove weld can be calculated by using the load borne by the whole base metal and the penetration depth. The penetration depth of the incomplete penetration groove weld is considered in the first normal stress, so as to increase the evaluation accuracy of the strength of the incomplete penetration groove weld.
[0058] The first normal stress borne by the fillet weld or the incomplete penetration groove weld can be calculated by using the first mathematical model, and the first mathematical model can be as follows:
[0059]
[0060] A w =α*t w ,
[0061]
[0062] In the formula, f n represents the first normal stress borne by the fillet weld or the incomplete penetration groove weld, P represents the load borne by the base metal with a thinner thickness in the fillet weld or the whole base metal in the incomplete penetration groove weld per unit length, A w represents the bearing area of the fillet weld or the incomplete penetration groove weld per unit length, and St represents the shell element top layer Z-direction normal stress, S b represents the shell element bottom layer Z-direction normal stress, t b represents the first plate thickness or the second plate thickness, t w represents the throat size or the penetration, and a represents the number of welding surfaces. Wherein, a can be 1 or 2.
[0063] It should be noted that the shell element top layer Z-direction normal stress and the shell element bottom layer Z-direction normal stress correspond to the normal stress borne by the base material. The load borne by the base material can be calculated. Then, the first normal stress borne by the weld can be calculated by using the relationship that the load borne by the base material is equal to the load borne by the weld.
[0064] In one or more embodiments, the shell element top layer Z-direction normal stress and the shell element bottom layer Z-direction normal stress can be used to calculate the second normal stress borne by the fillet weld due to the bending moment. The method can include the following steps (S401-S403):
[0065] S401, determine the base material corresponding to the thinner base material of the fillet weld. The detailed process can refer to the related description of step S201, which will not be repeated here.
[0066] S402, obtain the first plate thickness of the thinner base material. The detailed process can refer to the related description of step S202, which will not be repeated here.
[0067] S403, based on the shell element top layer Z-direction normal stress, the shell element bottom layer Z-direction normal stress, the first plate thickness and the throat size, calculate the second normal stress borne by the fillet weld due to the bending moment.
[0068] In the finite element model of the fillet weld, the shell element top layer Z-direction normal stress and the shell element bottom layer Z-direction normal stress correspond to the stress borne by the base material. The bending moment borne by the thinner base material can be calculated based on the shell element top layer Z-direction normal stress, the shell element bottom layer Z-direction normal stress and the first plate thickness. Then, the second normal stress borne by the fillet weld due to the bending moment can be calculated by using the characteristic that the bending moment borne by the base material is equal to the bending moment borne by the weld, combined with the throat size. Considering the throat size of the fillet weld in the second normal stress can further increase the evaluation accuracy of the strength of the fillet weld.
[0069] The shell element top layer Z-direction normal stress and the shell element bottom layer Z-direction normal stress can be used to calculate the second normal stress borne by the incomplete penetration groove weld due to the bending moment. The method can include the following steps (S501-S502):
[0070] S501, obtain the second plate thickness of the entire base material corresponding to the incomplete penetration groove weld. The detailed process can refer to the related description of step S301, which will not be repeated here.
[0071] S502, calculating the second normal stress of the incomplete penetration groove weld due to the bending moment based on the top shell element Z-direction normal stress, the bottom shell element Z-direction normal stress, the second plate thickness and the penetration.
[0072] In the finite element model of the incomplete penetration groove weld, the top shell element Z-direction normal stress and the bottom shell element Z-direction normal stress correspond to the stress borne by the whole base metal, the bending moment borne by the whole base metal can be calculated by using the top shell element Z-direction normal stress, the bottom shell element Z-direction normal stress and the second plate thickness, and the second normal stress of the incomplete penetration groove weld due to the bending moment can be calculated by using the characteristic that the bending moment borne by the whole base metal is equal to the bending moment borne by the weld and combining the penetration. The penetration of the incomplete penetration groove weld is considered in the second normal stress, which can further increase the evaluation accuracy of the strength of the incomplete penetration groove weld.
[0073] The second normal stress of the fillet weld or the incomplete penetration groove weld due to the bending moment can be calculated by using the second mathematical model, which can be as follows:
[0074]
[0075]
[0076]
[0077] In the formula, M represents the bending moment borne by the base metal with thinner thickness in the fillet weld or the whole base metal in the incomplete penetration groove weld per unit length, f b represents the second normal stress of the fillet weld or the incomplete penetration groove weld due to the bending moment, S t represents the top shell element Z-direction normal stress, S b represents the bottom shell element Z-direction normal stress, t b represents the first plate thickness or the second plate thickness, S w represents the cross-section bending coefficient, t w represents the throat size or the penetration, and θ represents the compensation coefficient. The compensation coefficient can be a constant or a variable. When the fillet weld is double-sided welded, the compensation coefficient θ can be 0; when the incomplete penetration groove weld is double-sided welded, the compensation coefficient can be a variable, for example, the compensation coefficient can be as follows:
[0078]
[0079] In one or more embodiments, the top shell element YZ plane shear stress, the top shell element XZ plane shear stress, the bottom shell element YZ plane shear stress and the bottom shell element XZ plane shear stress can be used to calculate the shear stress borne by the fillet weld, which can include the following steps (S601-S603):
[0080] S601, determine the base material with a thinner thickness corresponding to the fillet weld. For details, refer to the relevant description of step S201, which will not be repeated here.
[0081] S602, obtain the first plate thickness of the base material with a thinner thickness. For details, refer to the relevant description of step S202, which will not be repeated here.
[0082] S603, calculate the shear stress borne by the fillet weld based on the shell element top layer YZ plane shear stress, the shell element top layer XZ plane shear stress, the shell element bottom layer YZ plane shear stress, the shell element bottom layer XZ plane shear stress, the first plate thickness, and the throat size.
[0083] In the finite element model of the fillet weld, the shell element top layer YZ plane shear stress, the shell element top layer XZ plane shear stress, the shell element bottom layer YZ plane shear stress, and the shell element bottom layer XZ plane shear stress correspond to the stress borne by the base material. The shear force borne by the base material with a thinner thickness can be calculated using the shell element top layer YZ plane shear stress, the shell element top layer XZ plane shear stress, the shell element bottom layer YZ plane shear stress, the shell element bottom layer XZ plane shear stress, and the first plate thickness. According to the fact that the shear force borne by the base material is equal to the shear force borne by the weld, and combined with the throat size, the shear stress borne by the fillet weld can be calculated. Considering the throat size of the fillet weld in the shear stress can further increase the accuracy of the evaluation of the strength of the fillet weld.
[0084] The shell element top layer YZ plane shear stress, the shell element top layer XZ plane shear stress, the shell element bottom layer YZ plane shear stress, and the shell element bottom layer XZ plane shear stress can be used to calculate the shear stress borne by the incomplete penetration groove weld, which can include the following steps (S701-S702):
[0085] S701, obtain the second plate thickness of the base material corresponding to the incomplete penetration groove weld as a whole. For details, refer to the relevant description of step S301, which will not be repeated here.
[0086] S702, calculate the shear stress borne by the incomplete penetration groove weld based on the shell element top layer YZ plane shear stress, the shell element top layer XZ plane shear stress, the shell element bottom layer YZ plane shear stress, the shell element bottom layer XZ plane shear stress, the second plate thickness, and the penetration depth.
[0087] In the finite element model of the incomplete penetration groove weld, the stress borne by the whole base metal can be calculated by using the top layer YZ plane shear stress of the shell element, the top layer XZ plane shear stress of the shell element, the bottom layer YZ plane shear stress of the shell element, the bottom layer XZ plane shear stress of the shell element and the second plate thickness. Since the shear force borne by the incomplete penetration groove weld is equal to the shear force borne by the whole base metal, the shear stress borne by the incomplete penetration groove weld can be calculated in combination with the penetration. The penetration of the incomplete penetration groove weld is considered in the shear stress, which can further increase the evaluation accuracy of the strength of the incomplete penetration groove weld.
[0088] The shear stress borne by the fillet weld or the incomplete penetration groove weld can be calculated by a third mathematical model, which can be:
[0089]
[0090]
[0091]
[0092] V = T * t b ,
[0093] A w = a * t w ,
[0094]
[0095] In the formula, f s represents the shear stress borne by the fillet weld or the incomplete penetration groove weld, represents the top layer YZ plane shear stress of the shell element, represents the top layer XZ plane shear stress of the shell element, represents the bottom layer YZ plane shear stress of the shell element, represents the bottom layer XZ plane shear stress of the shell element, T yz represents the average YZ plane shear stress of the shell element layer, T xz represents the average XZ plane shear stress of the shell element layer, T represents T yz and T xz after synthesis, t b represents the first plate thickness or the second plate thickness, V represents the shear force borne by the whole base metal in the thinner base metal of the fillet weld or the base metal of the incomplete penetration groove weld per unit length, A w represents the carrying area of the fillet weld or the incomplete penetration groove weld per unit length, t w represents the throat size or the penetration, and a represents the number of welding surfaces.
[0096] In one or more embodiments, Figure 4 To Figure 1 The flowchart of step S103 is shown in FIG. 10. As shown in FIG. 10, the step S103 of evaluating whether the strength of the fillet weld or the incomplete penetration groove weld is qualified based on the first normal stress, the second normal stress and the shear stress can include the following steps (S1031-S1034): Figure 4
[0097] S1031, calculate the resultant stress of the fillet weld or the incomplete penetration groove weld based on the first normal stress, the second normal stress and the shear stress.
[0098] The resultant stress of the fillet weld or the incomplete penetration groove weld can be calculated using the first normal stress, the second normal stress and the shear stress, i.e. the total stress of the fillet weld or the incomplete penetration groove weld. The resultant stress of the fillet weld or the incomplete penetration groove weld can be calculated by a fourth mathematical model, which can be:
[0099]
[0100] In the formula, f w represents the resultant stress, f n represents the first normal stress, f b represents the second normal stress, and f s represents the shear stress.
[0101] S1032, judge whether the resultant stress is less than or equal to the corresponding allowable stress.
[0102] The fillet weld and the incomplete penetration groove weld have their respective corresponding allowable stresses, which can be obtained by referring to a table or calculated according to the welding material. When calculated according to the welding material, the allowable stress can be:
[0103] f a = ω * f c ,
[0104] In the formula, f a represents the allowable stress of the fillet weld or the incomplete penetration groove weld, f c represents the tensile strength of the welding material, and ω represents a preset coefficient, which can be a constant, for example, ω takes a value of 0.5, 0.6 or 0.7.
[0105] When the resultant stress is less than or equal to the corresponding allowable stress, then step S1033 is performed to confirm that the strength of the fillet weld or the incomplete penetration groove weld is qualified; when the resultant stress is greater than the corresponding allowable stress, then step S1034 is performed to confirm that the strength of the fillet weld or the incomplete penetration groove weld is unqualified.
[0106] The embodiment considers the throat size of the fillet weld or the penetration of the incomplete penetration groove weld when evaluating the strength of the fillet weld or the incomplete penetration groove weld, and comprehensively considers the first normal stress, the shear stress and the second normal stress due to the bending moment borne by the fillet weld or the incomplete penetration groove weld, so that the result of the fillet weld or the incomplete penetration groove weld is more accurate.
[0107] Embodiment 2
[0108] The embodiment provides a weld strength evaluation device, which can be a computer device or be arranged in a computer device. Figure 5 As shown in a structural block diagram of the weld strength evaluation device provided in the embodiment of the present application, Figure 5 the device comprises an acquisition module 301, a calculation module 302 and an evaluation module 303.
[0109] The acquisition module 301 is configured to acquire finite element analysis data of a weld to be evaluated, wherein the finite element analysis data comprises stress of a corresponding base material of the weld to be evaluated, and the weld to be evaluated comprises a fillet weld or an incomplete penetration groove weld. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0110] The calculation module 302 is configured to calculate a first normal stress borne by the weld to be evaluated, a second normal stress borne by the weld to be evaluated due to a bending moment, and a shear stress borne by the weld to be evaluated, based on the stress of the corresponding base material and the throat size of the fillet weld or the penetration of the incomplete penetration groove weld. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0111] The evaluation module 303 is configured to evaluate whether the strength of the fillet weld or the incomplete penetration groove weld is qualified, based on the first normal stress, the second normal stress and the shear stress. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0112] A three-dimensional coordinate system is established for the finite element model, with the X direction being parallel to the length direction of the weld, the Y direction being the normal direction of the shell element, and the Z direction being perpendicular to the length direction of the weld and being the normal direction of the shell element. The stress of the corresponding base material of the weld comprises Z-direction normal stress of the top layer of the shell element and Z-direction normal stress of the bottom layer of the shell element. In one or more embodiments, Figure 6 a structure diagram of the calculation module in Figure 5 a structure diagram of the calculation module in Figure 7 a structure diagram of the calculation module in Figure 5 As shown in Figure 6 and Figure 7 the calculation module 302 can comprise a determination unit 3021, a first acquisition unit 3022 and a first calculation unit 3023, or the calculation module 302 can comprise a second acquisition unit 3024 and a second calculation unit 3025.
[0113] The determination unit 3021 is configured to determine the base material with a thinner thickness corresponding to the fillet weld. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0114] The first acquisition unit 3022 is configured to acquire a first plate thickness of the base material with the thinner thickness. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0115] The first calculation unit 3023 is configured to calculate a first normal stress borne by the fillet weld based on the normal stress in the Z direction of the top layer of the shell unit, the normal stress in the Z direction of the bottom layer of the shell unit, the first plate thickness, and the throat size. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0116] The second acquisition unit 3024 is configured to acquire a second plate thickness of the whole base material corresponding to the incomplete penetration groove weld. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0117] The second calculation unit 3025 is configured to calculate a first normal stress borne by the incomplete penetration groove weld based on the normal stress in the Z direction of the top layer of the shell unit, the normal stress in the Z direction of the bottom layer of the shell unit, the second plate thickness, and the penetration depth. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0118] In one or more embodiments, Figure 8 As Figure 5 Another structural diagram of the calculation module, Figure 9 As Figure 5 Still another structural diagram of the calculation module. As Figure 8 and Figure 9 shown, the calculation module 302 can include the determination unit 3021, the first acquisition unit 3022, and the third calculation unit 3026; or the calculation module 302 can include the second acquisition unit 3024 and the fourth calculation unit 3027.
[0119] The determination unit 3021 is configured to determine the base material with a thinner thickness corresponding to the fillet weld. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0120] The first acquisition unit 3022 is configured to acquire a first plate thickness of the base material with the thinner thickness. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0121] The third calculation unit 3026 is configured to calculate a second normal stress borne by the fillet weld due to the bending moment based on the normal stress in the Z direction of the top layer of the shell unit, the normal stress in the Z direction of the bottom layer of the shell unit, the first plate thickness, and the throat size. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0122] or the second acquisition unit 3024 is configured to acquire a second plate thickness of the whole base metal corresponding to the incomplete penetration groove weld; for details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0123] The fourth calculation unit 3027 is configured to calculate a second normal stress borne by the incomplete penetration groove weld due to the bending moment based on the Z-direction normal stress of the top layer of the shell element, the Z-direction normal stress of the bottom layer of the shell element, the second plate thickness and the penetration depth; for details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0124] The stress of the base metal corresponding to the weld to be evaluated can also include the YZ plane shear stress of the top layer of the shell element, the XZ plane shear stress of the top layer of the shell element, the YZ plane shear stress of the bottom layer of the shell element and the XZ plane shear stress of the bottom layer of the shell element. In one or more embodiments, Figure 10 For Figure 5 Another structural diagram of the calculation module in Embodiment 1 is shown in FIG. 3B. Figure 11 For Figure 5 Another structural diagram of the calculation module in Embodiment 1 is shown in FIG. 3B. Figure 10 and Figure 11 As shown in FIG. 3B, the calculation module 302 can include the determination unit 3021, the first acquisition unit 3022 and the fifth calculation unit 3028; or the calculation module 302 can include the second acquisition unit 3024 and the sixth calculation unit 3029.
[0125] The determination unit 3021 is configured to determine the base metal with thinner thickness in the corner weld corresponding base metal; for details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0126] The first acquisition unit 3022 is configured to acquire a first plate thickness of the base metal with thinner thickness; for details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0127] The fifth calculation unit 3028 is configured to calculate the shear stress borne by the corner weld based on the YZ plane shear stress of the top layer of the shell element, the XZ plane shear stress of the top layer of the shell element, the YZ plane shear stress of the bottom layer of the shell element and the XZ plane shear stress of the bottom layer of the shell element, the first plate thickness and the throat size; for details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0128] or the second acquisition unit 3024 is configured to acquire a second plate thickness of the whole base metal corresponding to the incomplete penetration groove weld; for details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0129] The sixth calculation unit 3029 is configured to calculate the shear stress borne by the incomplete penetration groove weld based on the shell unit top layer YZ plane shear stress, the shell unit top layer XZ plane shear stress, the shell unit bottom layer YZ plane shear stress, the shell unit bottom layer XZ plane shear stress, the second plate thickness, and the penetration depth. For details, please refer to the related description in Embodiment 1, which will not be repeated here.
[0130] The effect of the weld strength evaluation device in this embodiment can be seen in the related description in Embodiment 1, which will not be repeated here.
[0131] Embodiment 3
[0132] This embodiment provides a computer device, Figure 12 The principle block diagram of the computer device provided in the embodiments of the present application is shown in FIG. 4. Figure 12 As shown in the figure, the computer device includes a processor 401 and a memory 402, wherein the processor 401 and the memory 402 can be connected through a bus or other means, Figure 12 For example, by bus connection.
[0133] The processor 401 can be a central processing unit (CPU). The processor 401 can also be other general-purpose processors, digital signal processors (DSP), graphics processing units (GPU), embedded neural network processing units (NPU) or other dedicated deep learning coprocessors, application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. chips, or combinations of the above chips.
[0134] The memory 402 as a non-transitory computer readable storage medium can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as program instructions / modules of the weld strength evaluation method in the embodiments of the present application (such as the acquisition module 301, the calculation module 302 and the evaluation module 303 in the above embodiments). The processor 401 executes various functions of the processor and data processing by running the non-transitory software programs, instructions and modules stored in the memory 402, that is, realizes the weld strength evaluation method described above.
[0135] The memory 402 can include a program storage area and a data storage area, where the program storage area can store an operating system, application programs required by at least one function, and the data storage area can store data created by the processor 401 and the like. In addition, the memory 402 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory 402 can optionally include a memory disposed remotely from the processor 401, which can be connected to the processor 401 through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.
[0136] The embodiments of the present application also provide a computer readable storage medium, which stores computer executable instructions. The computer executable instructions can execute the weld strength evaluation method in any method embodiment described above. The storage medium can be a disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory, a Hard Disk Drive (HDD) or a Solid-State Drive (SSD), etc. The storage medium can also include a combination of the above types of memories.
[0137] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.
Claims
1. A method of weld strength assessment, characterized by, The method comprises: acquiring finite element analysis data for a weld to be evaluated; wherein the finite element analysis data comprises stress of a corresponding base material of the weld to be evaluated, and the weld to be evaluated comprises a fillet weld or an open root groove weld; calculating first normal stress borne by the weld to be evaluated, second normal stress borne by the weld to be evaluated due to bending moment, and shear stress borne by the weld to be evaluated based on the stress of the corresponding base material and throat size of the fillet weld or penetration of the open root groove weld; evaluating whether the strength of the fillet weld or the open root groove weld is qualified based on the first normal stress, the second normal stress, and the shear stress; establishing a three-dimensional coordinate system for a finite element model in parallel to a length direction of the weld as an X direction, a normal direction of a shell element as a Y direction, and perpendicular to the length direction of the weld as a Z direction, the stress of the corresponding base material comprising Z direction normal stress of a top layer of the shell element and Z direction normal stress of a bottom layer of the shell element; the calculation of the first normal stress borne by the weld to be evaluated comprising: determining a base material with a thinner thickness in the corresponding base material of the fillet weld; acquiring a first plate thickness of the base material with the thinner thickness; calculating the first normal stress borne by the fillet weld based on the Z direction normal stress of the top layer of the shell element, the Z direction normal stress of the bottom layer of the shell element, the first plate thickness, and the throat size; or acquiring a second plate thickness of the whole corresponding base material of the open root groove weld; calculating the first normal stress borne by the open root groove weld based on the Z direction normal stress of the top layer of the shell element, the Z direction normal stress of the bottom layer of the shell element, the second plate thickness, and the penetration.
2. The weld strength evaluation method of claim 1, wherein, The calculation of the first normal stress borne by the weld to be evaluated specifically comprises: calculating the first normal stress borne by the weld to be evaluated through a first mathematical model, the first mathematical model comprising: ， ， ， wherein the represents a first normal stress that a fillet weld or an underbead groove weld bears, the represents a load that a base material of which thickness is thinner in a fillet weld or a base material as a whole in an underbead groove weld bears per unit length, the represents a bearing area of a fillet weld or an underbead groove weld per unit length, the represents a Z-direction normal stress of a top layer of a shell unit, the represents a Z-direction normal stress of a bottom layer of a shell unit, the represents a first plate thickness or a second plate thickness, the represents a throat size or a penetration, the represents a number of weld faces.
3. The weld strength assessment method of claim 1, wherein, The calculation of the second normal stress borne by the weld to be evaluated due to bending moment comprises: determining a base material with a thinner thickness in the corresponding base material of the fillet weld; acquiring a first plate thickness of the base material with the thinner thickness; calculating the second normal stress borne by the fillet weld due to bending moment based on the Z direction normal stress of the top layer of the shell element, the Z direction normal stress of the bottom layer of the shell element, the first plate thickness, and the throat size; or acquiring a second plate thickness of the whole corresponding base material of the open root groove weld; calculating the second normal stress borne by the open root groove weld due to bending moment based on the Z direction normal stress of the top layer of the shell element, the Z direction normal stress of the bottom layer of the shell element, the second plate thickness, and the penetration.
4. The weld strength evaluation method of claim 3, wherein, The calculation of the second normal stress borne by the weld to be evaluated due to bending moment specifically comprises: calculating the second normal stress borne by the weld to be evaluated due to bending moment through a second mathematical model, the second mathematical model comprising: ， ， ， In the formula, the M represents a bending moment that a base material with a thinner thickness in a fillet weld or a base material as a whole in a partially penetrated groove weld bears, the represents a second normal stress that a fillet weld or a partially penetrated groove weld bears due to a bending moment, the represents a Z-direction normal stress of a top layer of a shell unit, the represents a Z-direction normal stress of a bottom layer of a shell unit, the represents a first plate thickness or a second plate thickness, the represents a cross-sectional bending coefficient, the represents a throat size or a penetration, and the represents a compensation coefficient.
5. The weld strength assessment method of claim 1, wherein, The stress of the corresponding base material comprises YZ plane shear stress of a top layer of the shell element, XZ plane shear stress of the top layer of the shell element, YZ plane shear stress of a bottom layer of the shell element, and XZ plane shear stress of the bottom layer of the shell element; The calculation of the shear stress borne by the weld to be evaluated comprises: determining a base material with a thinner thickness in the corresponding base material of the fillet weld; acquiring a first plate thickness of the base material with the thinner thickness; calculating the shear stress borne by the fillet weld based on the YZ plane shear stress of the top layer of the shell element, the XZ plane shear stress of the top layer of the shell element, the YZ plane shear stress of the bottom layer of the shell element, the XZ plane shear stress of the bottom layer of the shell element, the first plate thickness, and the throat size; or obtain a second plate thickness of the whole of the corresponding base material of the incomplete penetration groove weld; based on the shell element top layer YZ plane shear stress, the shell element top layer XZ plane shear stress, the shell element bottom layer YZ plane shear stress and the shell element bottom layer XZ plane shear stress, the second plate thickness and the penetration, calculate the shear stress borne by the incomplete penetration groove weld.
6. The weld strength assessment method of claim 5, wherein, Calculate the shear stress borne by the weld to be evaluated, specifically: The shear stress borne by the weld to be evaluated is calculated by a third mathematical model, and the third mathematical model comprises: ， ， ， ， ， ， In the formula, the represents the shear stress borne by the fillet weld or the underbead groove weld, the represents the shear stress on the top YZ plane of the shell element, the represents the shear stress on the top XZ plane of the shell element, the represents the shear stress on the bottom YZ plane of the shell element, the represents the shear stress on the bottom XZ plane of the shell element, the represents the average shear stress on the YZ plane of the shell element, the represents the average shear stress on the XZ plane of the shell element, the represents and the shear stress after synthesis, the represents the first plate thickness or the second plate thickness, the represents the shear force borne by the base material with thinner thickness in the unit length of the fillet weld or the base material as a whole in the underbead groove weld, the represents the bearing area of the fillet weld or the underbead groove weld per unit length, the represents the throat size or the penetration, the represents the number of welding surfaces.
7. The weld strength evaluation method according to any one of claims 1 to 6, characterized by, The evaluation of the strength of the fillet weld or the incomplete penetration groove weld based on the first normal stress, the second normal stress and the shear stress comprises: Based on the first normal stress, the second normal stress and the shear stress, the combined stress of the fillet weld or the incomplete penetration groove weld is calculated; If the combined stress is less than or equal to the corresponding allowable stress, it is confirmed that the strength of the fillet weld or the incomplete penetration groove weld is qualified; If the combined stress is greater than the corresponding allowable stress, it is confirmed that the strength of the fillet weld or the incomplete penetration groove weld is unqualified.
8. The weld strength assessment method of claim 7, wherein, The combined stress of the fillet weld or the incomplete penetration groove weld is calculated, specifically: The combined stress of the fillet weld or the incomplete penetration groove weld is calculated by a fourth mathematical model, and the fourth mathematical model comprises: ， In the formula, the represents a synthetic stress, the represents a first normal stress, the represents a second normal stress, the represents a shear stress.
9. A weld strength assessment apparatus, characterized by, The device comprises: An acquisition module is configured to acquire finite element analysis data for a weld to be evaluated; wherein the finite element analysis data comprises stress of a corresponding base material of the weld to be evaluated, and the weld to be evaluated comprises a fillet weld or an incomplete penetration groove weld; A calculation module is configured to calculate, based on the stress of the corresponding base material and a throat size of the fillet weld or a penetration of the incomplete penetration groove weld, a first normal stress borne by the weld to be evaluated, a second normal stress borne by the weld to be evaluated due to a bending moment, and a shear stress borne by the weld to be evaluated; An evaluation module is configured to evaluate, based on the first normal stress, the second normal stress and the shear stress, whether the strength of the fillet weld or the incomplete penetration groove weld is qualified; A three-dimensional coordinate system is established for the finite element model with a direction parallel to a length direction of the weld as an X direction, a normal direction of a shell element as a Y direction, and a direction perpendicular to the length direction of the weld and the normal direction of the shell element as a Z direction; the stress of the corresponding base material comprises a Z-direction normal stress of a top layer of the shell element and a Z-direction normal stress of a bottom layer of the shell element; the calculation of the first normal stress borne by the weld to be evaluated comprises: Determine the base material with a thinner thickness in the corresponding base material of the fillet weld; Obtain a first plate thickness of the base material with the thinner thickness; Based on the Z-direction normal stress of the top layer of the shell element, the Z-direction normal stress of the bottom layer of the shell element, the first plate thickness and the throat size, calculate the first normal stress borne by the fillet weld; Or obtain a second plate thickness of the whole of the corresponding base material of the incomplete penetration groove weld; Based on the Z-direction normal stress of the top layer of the shell element, the Z-direction normal stress of the bottom layer of the shell element, the second plate thickness and the penetration, calculate the first normal stress borne by the incomplete penetration groove weld.
10. A computer device, comprising: Comprise: A memory; A processor; And A computer program; The computer program is stored in the memory and is configured to be executed by the processor to implement the method of any one of claims 1-8.
11. A computer readable storage medium, characterized in that, a computer program is stored thereon; the computer program is executed by a processor to implement the method according to any one of claims 1-8.