Static strength test device and airworthiness conformity evaluation method

Abstract

The invention belongs to the technical field of additive manufacturing, and discloses a static strength test device and an airworthiness conformity evaluation method.The device is used for measuring the static strength of a gooseneck joint and comprises a fixed base and a movable base. One end of the gooseneck connector is detachably connected to the fixed base, the other end of the gooseneck connector is detachably connected to the movable base, the movable base can move in the first horizontal direction relative to the fixed base, and the first horizontal direction is parallel to the extending direction of the gooseneck connector. Through the arrangement, the static strength test device can efficiently and accurately realize the static strength test of the gooseneck joint. According to the airworthiness conformity evaluation method, the static strength experimental device is used, and the airworthiness conformity of the gooseneck joint can be well verified and evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular to a static strength test device and airworthiness compliance evaluation method. BACKGROUND

[0002] As a kind of additive manufacturing technology, selective laser melting technology can realize the integrated forming of complex parts, but the change of features will often lead to the attenuation of airworthiness compliance of typical structures. For the field of civil aircraft manufacturing, as a new process technology, there is not enough material allowable value and structure design value to represent the airworthiness compliance of different part features, so in the development of airworthiness verification work, the airworthiness compliance characterization of additive manufacturing parts will be a relatively difficult problem, which often needs to be based on a large number of test verification to characterize the stability of the material. Therefore, how to characterize the part airworthiness compliance to meet the requirements of engineering documents and airworthiness standards will be a key technical problem.

[0003] From the perspective of airworthiness, for additive manufacturing parts, carrying out static strength experiments can effectively characterize the airworthiness compliance of the parts, but for some non-standard parts, such as Figure 1 The gooseneck joint 100 shown in the drawing, carrying out strength characterization on a tensile testing machine often cannot be realized, and the load cannot be met, because the conventional tensile testing machine often carries out strength test for standard samples, and for large parts, the simulation of working condition needs to be realized. Therefore, for specific parts, simulating the actual service working condition, designing a special static strength test device can properly express the true airworthiness compliance of the parts, and then meet the verification requirements of airworthiness clauses to reach the installed application state.

[0004] In summary, a static strength test device and airworthiness compliance evaluation method are needed to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a static strength test device, which can efficiently and accurately realize the static strength test of the gooseneck joint.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] A static strength test device for measuring the static strength of a gooseneck joint, comprising:

[0008] A fixed base;

[0009] A movable seat, one end of the gooseneck joint is detachably connected to the fixed base, the other end is detachably connected to the movable seat, and the movable seat can move relative to the fixed base along a first horizontal direction, and the first horizontal direction is parallel to the extension direction of the gooseneck joint.

[0010] Optionally, the fixed base is provided with a fixed part, one end of the gooseneck joint is provided with a joint web plate, and the joint web plate can abut and detachably connect to the fixed part.

[0011] Optionally, the fixed base is provided with a reinforcing rib, and the reinforcing rib is arranged at one end of the fixed part away from the gooseneck joint.

[0012] Optionally, the static strength test device further comprises a connecting piece, the connecting piece is detachably connected to the movable seat, the connecting piece is provided with a connecting groove, and the other end of the gooseneck joint can extend into and be connected to the connecting groove.

[0013] Optionally, the other end of the gooseneck joint is provided with a joint through hole, a first bolt passes through the joint through hole and is connected to the groove wall of the connecting groove, and the end of the first bolt passing out of the connecting groove is provided with an open pin.

[0014] Optionally, the connecting piece is provided with an upper web plate and a lower web plate extending at an included angle with each other, and the upper web plate and the lower web plate abut and detachably connect to the movable seat.

[0015] Optionally, the static strength test device further comprises a stretching driver, and an output end of the stretching driver is connected to the movable seat and can drive the movable seat to move along the first horizontal direction.

[0016] Optionally, the movable seat is provided with a plurality of through grooves, the output end of the stretching driver is provided with a plurality of connecting rods, a plurality of the connecting rods correspondingly extend into a plurality of the through grooves and are connected to the movable seat.

[0017] Optionally, the movable seat is provided with an opening hole penetrating along a second horizontal direction, a second bolt passes through the opening hole and a plurality of the connecting rods, and can detachably connect the connecting rods to the movable seat, and the second horizontal direction is perpendicular to the first horizontal direction.

[0018] Another object of the present application is to provide a method for evaluating airworthiness compliance, which can well verify and evaluate the airworthiness compliance of the gooseneck joint.

[0019] To achieve this object, the present application adopts the following technical solutions:

[0020] A method for evaluating airworthiness compliance, which uses the static strength test device as described above, comprising the following steps:

[0021] Step 1, establishing raw material specifications;

[0022] Step 2, establishing process specifications;

[0023] Step three, carry out equipment identification, process identification and product identification;

[0024] Step four, define the limit load and the ultimate load;

[0025] Step five, measure the static strength of the goose neck joint by using the static strength test device;

[0026] Step six, carry out safety margin evaluation.

[0027] The beneficial effects of the present application are:

[0028] The present application provides a static strength test device for measuring the static strength of a goose neck joint, comprising a fixed base and a movable seat. One end of the goose neck joint is detachably connected to the fixed base, and the other end is detachably connected to the movable seat, thereby facilitating installation and disassembly for test personnel and improving work efficiency. The movable seat can move relative to the fixed base along a first horizontal direction, thereby applying different loads to the goose neck joint, so that the goose neck joint can be stretched along the first horizontal direction, and when the goose neck joint deforms or breaks under the action of tension, the static strength test can be completed. The first horizontal direction is parallel to the extension direction of the goose neck joint, so as to ensure that the goose neck joint moves in the direction of force under actual working conditions, thereby improving the accuracy of the test. Through the above arrangement, the static strength test device of the present application can efficiently and accurately realize the static strength test of the goose neck joint.

[0029] The present application also provides a method for airworthiness compliance evaluation. By establishing raw material specifications and process specifications, the manufacturing quality of the goose neck joint and the controllability and repeatability of the manufacturing process are ensured. Equipment identification, process identification and product identification are carried out for the additive manufacturing process to realize stable control of the process, so as to further ensure the quality of the goose neck joint manufacturing. Then, by defining the limit load and the ultimate load, the subsequent static strength test of the goose neck joint is prepared, and a static strength test device is used to simulate the stress condition of the goose neck joint under actual working conditions, thereby obtaining the static strength data of the goose neck joint. On this basis, through safety margin evaluation, it is judged whether the goose neck joint can maintain a certain safety performance when bearing the ultimate load, so as to evaluate the airworthiness compliance of the goose neck joint. Through the above steps, the airworthiness compliance of the goose neck joint can be well evaluated. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of a goose neck joint;

[0031] Figure 2 is an axonometric view of the static strength test device provided by the embodiment of the present application; Figure 1 ;

[0032] Figure 3 is an axonometric view of the static strength test device provided by the embodiment of the present application;Figure 2 ;

[0033] Figure 4 is a use schematic view of the static strength test device provided by the embodiment of the present application.

[0034] in the figure:

[0035] 100, gooseneck joint; 101, joint web; 102, joint through hole;

[0036] 1, fixed base; 11, fixed part; 12, reinforcing rib; 2, movable seat; 21, through slot; 22, opening; 3, connecting piece; 31, connecting slot; 32, upper web; 33, lower web; 4, stretching driver; 41, connecting rod. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, not all the structures.

[0038] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] As shown in Figures 1-4 The present embodiment provides a static strength test device for measuring the static strength of the gooseneck joint 100, which comprises a fixed base 1 and a movable seat 2. One end of the gooseneck joint 100 is detachably connected to the fixed base 1, and the other end is detachably connected to the movable seat 2. The movable seat 2 is capable of moving along a first horizontal direction relative to the fixed base 1, and the first horizontal direction is parallel to the extension direction of the gooseneck joint 100.

[0042] In the present embodiment, one end of the gooseneck joint 100 is detachably connected to the fixed base 1, and the other end is detachably connected to the movable seat 2, so as to facilitate the installation and disassembly of the test personnel and improve the work efficiency. The movable seat 2 is capable of moving along a first horizontal direction relative to the fixed base 1, thereby applying different loads to the gooseneck joint 100, so that the gooseneck joint 100 can be stretched along the first horizontal direction. When the gooseneck joint 100 deforms or breaks under the action of tension, the static strength test can be completed. By making the first horizontal direction parallel to the extension direction of the gooseneck joint 100, the movement of the gooseneck joint 100 in the direction of force under actual working conditions is ensured, thereby improving the accuracy of the test. Through the above arrangement, the static strength test device of the present application can efficiently and accurately realize the static strength test of the gooseneck joint 100.

[0043] It can be understood that the fixed base 1 and the movable seat 2 are designed according to the shape of the gooseneck joint 100 to ensure the fit when the gooseneck joint 100 is installed, thereby improving the test accuracy. Moreover, the fixed base 1, the movable seat 2 and the gooseneck joint 100 are integrally formed by selective laser melting technology, and the material is titanium alloy, so as to ensure the safety and reliability of the operation.

[0044] Specifically, as shown in Figures 2-4 The fixed base 1 is provided with a fixed part 11, and one end of the gooseneck joint 100 is provided with a joint web plate 101, which can abut and be detachably connected to the fixed part 11. This can ensure that the gooseneck joint 100 does not slide or displace when subjected to load, thereby ensuring the accuracy and reliability of the test results. The detachable connection method includes bolt connection, buckle connection or other mechanical connection method, as long as the disassembly and assembly of each component is convenient, which is not limited here.

[0045] More specifically, as shown in Figures 2-4 The reinforcing rib 12 is arranged at the end of the fixed base 1 away from the gooseneck joint 100, which can ensure that the fixed base 1 can provide stable support when the gooseneck joint 100 is subjected to tensile load, reducing or avoiding deformation and displacement. Through the above arrangement, the structural strength and stability of the fixed base 1 can be enhanced to cope with the large load and stress that may occur during the test.

[0046] More specifically, in the present embodiment, the fixed base 1 includes a base and a fixed table, the base is selected as an I-shaped type, so that the fixed table can be detachably connected to the base, the fixed plate is arranged on the fixed table, and the extension direction of the fixed plate is arranged at an angle with the extension direction of the fixed table, so as to ensure that the above-mentioned components can be fitted to the gooseneck joint 100, and the fixed part 11 is arranged between the fixed plate and the fixed table, which can ensure that the gooseneck joint 100 will not slide or displace when subjected to load, thereby ensuring the accuracy and reliability of the test results. The above-mentioned detachable connection mode includes bolt connection, buckle connection or other mechanical connection mode, as long as the disassembly and assembly of each component are convenient, which is not limited here. In addition, in other embodiments, the base can also be selected as a U-shaped type, so as to facilitate the connection of each component, and the specific structure is not limited.

[0047] Specifically, as shown in Figures 2-4 The connecting piece 3 is detachably connected to the movable seat 2, so as to facilitate the installation and disassembly of each component. The connecting piece 3 is provided with a connecting groove 31, and the other end of the gooseneck joint 100 can be inserted into and connected to the connecting groove 31, so that the gooseneck joint 100 can bear the load from the movable seat 2 without unnecessary displacement or deformation. Through the above arrangement, the stable connection between the gooseneck joint 100 and the connecting piece 3 is ensured, and the accuracy and reliability of the test results are further improved.

[0048] More specifically, as shown in Figures 1-4As shown, the other end of the gooseneck joint 100 is provided with a joint through hole 102, and a first bolt passes through the joint through hole 102 and is connected to the groove wall of the connecting groove 31, thereby ensuring the stable connection between the gooseneck joint 100 and the connecting groove 31. The end of the first bolt that passes out of the connecting groove 31 is provided with a split pin, thereby playing a role of anti-loosening. During the test, the connection of the first bolt may be loose due to the tensile force of the gooseneck joint 100, which may cause the device to be unstable or even damaged. Based on this, after the first bolt is tightened, the split pin is inserted into the hole of the first bolt, and the tail of the split pin is pulled open, so that a certain resistance is formed between the split pin and the first bolt, preventing the rotation of the first bolt, thereby achieving the purpose of anti-loosening.

[0049] More specifically, a bushing is clamped between the gooseneck joint 100 and the groove wall of the connecting groove 31, and a gasket is clamped between the head of the first bolt and the connecting groove 31, so as to improve the stability of the connection of the components and prevent damage and crack initiation and propagation on the surface of the gooseneck joint 100 during the test.

[0050] Specifically, as shown in Figures 2-4 the connecting piece 3 is provided with an upper web plate 32 and a lower web plate 33 extending at an angle to each other, and the upper web plate 32 and the lower web plate 33 abut and are detachably connected to the movable seat 2, which can ensure the stability of the connecting piece 3 on the movable seat 2 and prevent the connecting piece 3 from shifting or rotating during the test, thereby ensuring the accuracy and reliability of the test. Since the upper web plate 32 and the lower web plate 33 extend at an angle to each other, when the gooseneck joint 100 is subjected to a load, the above structure can disperse the stress to two plate surfaces, which helps to reduce stress concentration and improve the load-carrying capacity of the connecting piece 3. In addition, the detachable connection between the upper web plate 32 and the lower web plate 33 and the movable seat 2 enables the connecting piece 3 to be conveniently installed and detached, which not only facilitates the test personnel to replace connecting pieces 3 of different specifications or types to adapt to gooseneck joints 100 of different sizes or structures, but also facilitates the test personnel to maintain and maintain the connecting piece 3.

[0051] Specifically, as shown in Figures 2-4 the static strength test device further comprises a tensile driver 4, and the output end of the tensile driver 4 is connected to the movable seat 2, which can drive the movable seat 2 to move along the first horizontal direction, thereby providing accurate tensile load for the gooseneck joint 100 and enhancing the automation and precise control capability of the device. In addition, the tensile driver 4 can adopt devices such as hydraulic cylinders or air cylinders, which have the characteristics of high precision, high reliability and good repeatability.

[0052] More specifically, as shown in Figures 2-4As shown, the movable seat 2 is provided with multiple through slots 21, and the output end of the tensile actuator 4 is provided with multiple connecting rods 41. The multiple connecting rods 41 extend into the multiple through slots 21 in a one-to-one correspondence and are connected to the movable seat 2. Each connecting rod 41 can independently apply force, thereby achieving precise control of the movement direction and speed of the movable seat 2, ensuring the accuracy and reliability of the test. By providing multiple connecting rods 41, the output force of the tensile actuator 4 can be dispersed to multiple points on the movable seat 2, helping to reduce stress concentration and damage risks caused by excessive force on a single point. At the same time, it can also ensure that the movable seat 2 can be evenly stressed when stretched, improving the accuracy of the test.

[0053] More specifically, if Figures 2-4 As shown, in this embodiment, the movable seat 2 is provided with an opening 22 extending along a second horizontal direction. The second bolt member passes through the opening 22 and a plurality of connecting rods 41, and can detachably connect the connecting rods 41 to the movable seat 2, ensuring that the movable seat 2 can remain stable when subjected to tensile force, avoiding test errors caused by loose connections, and facilitating disassembly and maintenance, making operation more convenient. The second horizontal direction is perpendicular to the first horizontal direction to ensure the stability and test accuracy of the gooseneck joint 100 when subjected to force. In addition, in other embodiments, a threaded rod can be passed through the opening 22 and the plurality of connecting rods 41, and two nuts can be screwed onto the two ends of the threaded rod extending from the opening 22, thereby ensuring that the connecting rod 41 can be detachably connected to the movable seat 2. Split pins are provided at both ends of the threaded rod to further improve operational safety.

[0054] This embodiment also provides an airworthiness compliance evaluation method, which uses the above-mentioned static strength test device and specifically includes the following steps:

[0055] Step 1: Establish raw material specifications.

[0056] Step 2: Establish process specifications.

[0057] Step 3: Carry out equipment identification, process identification and product identification.

[0058] Step 4: Define limit loads and ultimate loads.

[0059] Step 5: Use a static strength test device to measure the static strength of the gooseneck joint 100.

[0060] Step 6: Conduct safety margin evaluation.

[0061] In the embodiment, the manufacturing quality of the gooseneck joint 100 and the controllability and repeatability of the manufacturing process are ensured by establishing raw material specifications and process specifications. The stable control of the process is realized by carrying out equipment identification, process identification and product identification for the additive manufacturing process, so as to further ensure the quality of the gooseneck joint 100 manufacturing. Then, by defining the limit load and the ultimate load, the static strength test of the gooseneck joint 100 is prepared, and the static strength test device is used to simulate the stress condition of the gooseneck joint 100 in the actual working condition, so as to obtain the static strength data of the gooseneck joint 100. On this basis, the safety margin evaluation is carried out to judge whether the gooseneck joint 100 can maintain a certain safety performance when bearing the ultimate load, so as to evaluate the airworthiness compliance of the gooseneck joint 100. Through the above steps, the airworthiness compliance of the gooseneck joint 100 can be well evaluated.

[0062] In the above step one, according to the product design requirements, process selection and raw material properties, the raw material specification matrix is designed, the conformity experiment is carried out, and the raw material specification is established. The raw material specification includes technical requirements and acceptance indexes such as powder particle size, chemical composition and micro morphology.

[0063] In the above step two, the qualified supplier's powder raw material is used, the process parameters and formability are researched on the specified equipment, the corresponding process parameter window is established, the conformity description file is submitted for review by the reviewer, and the process specification is formed. The process specification includes the control requirements of raw materials, equipment and key process parameters, the detection and acceptance requirements of in-furnace test bars and non-destructive testing requirements, which can ensure that the product can be stably formed and manufactured according to the requirements of the process specification.

[0064] In the above step three, through equipment identification, process identification and product identification, the stable control of equipment, process and product manufacturing is realized, the conformity of material specification and process specification is verified, the key parameters of product manufacturing process are solidified, and the process file and manufacturing process of stable product production are formed.

[0065] In the above step four, according to the airworthiness clauses, referring to the service load of the product, the material coefficient is developed for the specific forming material, the material correction coefficient and the casting coefficient are applied based on the service load, and the limit load is obtained; on the basis of the limit load, the safety factor is applied to obtain the ultimate load.

[0066] In the above step five, the static strength test of the gooseneck joint 100 is carried out under the limit load and the ultimate load by using the static strength test device.

[0067] In step six, product safety margin evaluation is conducted, which requires that the structure of the gooseneck joint 100 must be able to withstand the limit load without harmful permanent deformation, and under any load up to the limit load, the deformation must not interfere with safe operation. For the limit load condition, the structure of the gooseneck joint 100 must be able to withstand the limit load for at least three seconds without failure. The static test to the limit load must include the limit deflection and the limit deformation caused by the load. If the above requirements are met, it indicates that the airworthiness compliance of the gooseneck joint 100 can meet the corresponding requirements.

[0068] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A static strength test device for measuring the static strength of a gooseneck joint (100), characterized in that: include: Fixed base (1); A movable seat (2), one end of the gooseneck joint (100) is detachably connected to the fixed base (1), and the other end is detachably connected to the movable seat (2), and the movable seat (2) is capable of moving relative to the fixed base (1) along a first horizontal direction, and the first horizontal direction is parallel to the extension direction of the gooseneck joint (100).

2. The static strength testing device according to claim 1, characterized in that: A fixing portion (11) is provided on the fixing base (1), and a joint web (101) is provided at one end of the gooseneck joint (100), wherein the joint web (101) can abut against and be detachably connected to the fixing portion (11).

3. The static strength testing device according to claim 2, characterized in that: A reinforcing rib (12) is provided on the fixed base (1), and the reinforcing rib (12) is arranged at an end of the fixed portion (11) away from the gooseneck joint (100).

4. The static strength testing device according to claim 1, characterized in that: The static strength test device further comprises a connecting piece (3), the connecting piece (3) being detachably connected to the movable seat (2), the connecting piece (3) being provided with a connecting groove (31), and the other end of the gooseneck joint (100) being able to extend into and be connected to the connecting groove (31).

5. The static strength testing device according to claim 4, characterized in that: The other end of the gooseneck joint (100) is provided with a joint through hole (102), a first bolt member passes through the joint through hole (102) and is connected to the groove wall of the connecting groove (31), and a cotter pin is provided on the end of the first bolt member passing through the connecting groove (31).

6. The static strength testing device according to claim 4, characterized in that: The connecting member (3) is provided with an upper web (32) and a lower web (33) extending at an angle to each other. The upper web (32) and the lower web (33) are both in contact with and detachably connected to the movable seat (2).

7. The static strength testing device according to claim 1, characterized in that: The static strength testing device further comprises a tensile driver (4), the output end of which is connected to the movable seat (2) and is capable of driving the movable seat (2) to move along the first horizontal direction.

8. The static strength testing device according to claim 7, characterized in that: The movable seat (2) is provided with a plurality of through slots (21), and the output end of the stretching driver (4) is provided with a plurality of connecting rods (41). The plurality of connecting rods (41) extend into the plurality of through slots (21) in a one-to-one correspondence and are connected to the movable seat (2).

9. The static strength testing device according to claim 8, characterized in that: The movable seat (2) is provided with an opening (22) extending through the second horizontal direction. A second bolt member passes through the opening (22) and a plurality of connecting rods (41), and the connecting rods (41) can be detachably connected to the movable seat (2). The second horizontal direction is perpendicular to the first horizontal direction.

10. The airworthiness conformity evaluation method is characterized by: Using the static strength test device according to any one of claims 1 to 9 comprises the following steps: Step 1: Establish raw material specifications; Step 2: Establish process specifications; Step 3: Conduct equipment identification, process identification and product identification; Step 4: Define limit loads and ultimate loads; Step 5: Using a static strength test device to measure the static strength of the gooseneck joint (100); Step 6: Conduct safety margin evaluation.

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