A multi-specimen stress loading support structure and design method

Abstract

The present invention provides a multi-specimen stress loading support structure and a design method, wherein the multi-specimen stress loading support structure is composed of a crossbeam, a base and a column, wherein the crossbeam is connected to the base through the column, and a plurality of stress loading devices are installed on the crossbeam, wherein the stress loading devices are used to apply a variety of force loads to the samples, wherein the stress loading devices correspond to the samples one-to-one, and a card slot is arranged on the base, wherein the card slot is engaged with the sample, wherein the sample corresponds to the card slot one-to-one, and the crossbeam includes a first main board, wherein a first transverse rib plate and a first longitudinal rib plate are arranged on the first main board, and the first transverse rib plate and the first longitudinal rib plate are cross-arranged to form a "well"-shaped structure. The multi-specimen stress loading support structure described in the present invention not only ensures the rigidity of the support structure, but also can install a plurality of stress loading devices and samples, thereby realizing a material mechanics test in which loads are applied separately to a plurality of samples.

Description

Technical Field

[0001] The invention relates to the technical field of material testing, and in particular to a multi-specimen stress loading support structure and a design method thereof. Background Art

[0002] Corrosion and fatigue are one of the main forms of failure of structural materials, especially metal structural materials. The corrosion performance data and fatigue performance data of materials obtained through experiments are important basic parameters for the safety and reliability design of structures. Since the corrosion performance of materials has the characteristics of many influencing factors and large dispersion of test data, a relatively complete set of corrosion performance data of a material needs to be obtained through a large number of tests; the fatigue performance of materials also has the characteristics of large dispersion of test data and needs to be obtained through a large number of tests. Stress is one of the main factors affecting the corrosion and fatigue behaviors of materials. A relatively complete set of corrosion performance data and fatigue performance data of a material need to include a series of corrosion test data and fatigue test data under loading stress level conditions. Establishing a multi-specimen stress loading test device that can independently apply stress loads to a large number of specimens at the same time is of great significance to improving the test efficiency of material corrosion and fatigue tests.

[0003] The patent application number CN201710174939.3 in the prior art discloses a large-scale MTS cyclic loading single multi-sample device and a discreteness identification method, including a base fixedly installed at a certain distance below the MTS loading head; a support platform, which is arranged above the base through a retractable support rod, and is composed of a lower panel, an upper panel, and a web; a plurality of sample fixing devices, which are evenly distributed in a ring and fixed in the center of the upper surface of the upper panel, and are composed of a sleeve and a deformation layer; a load distribution device, which is located between the MTS loading head and the sample fixing device, and is composed of a lower load plate and an upper load plate; a data acquisition system, which is composed of an axial force meter, a collection box, and a wire. This patent can perform cyclic loading on multiple samples at the same time, but the stiffness of the support structure is not enough to achieve the application of loads to multiple samples separately.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to propose a multi-specimen stress loading support structure and a design method to solve the problem in the prior art that the support structure is not rigid enough and cannot realize the inability to apply loads to multiple specimens individually.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A multi-specimen stress loading support structure, the multi-specimen stress loading support structure consists of a crossbeam, a base and a column, the crossbeam is connected to the base through the column, a plurality of stress loading devices are installed on the crossbeam, the stress loading devices are used to apply a variety of force loads to the samples, the stress loading devices correspond to the samples one-to-one, a card slot is arranged on the base, the card slot is engaged with the sample, the sample and the card slot correspond to each other one-to-one, the crossbeam includes a first main board, a first transverse rib plate and a first longitudinal rib plate are arranged on the first main board, the first transverse rib plate and the first longitudinal rib plate are cross-arranged to form a "well" shape structure.

[0008] The multi-specimen stress loading support structure described in the present invention can, on the one hand, install multiple stress loading devices and specimens that can independently apply loads, and on the other hand, ensure the rigidity of the support structure to reduce interference between multiple stress loading devices.

[0009] Furthermore, the base includes a second main board, on which a second transverse rib plate and a second longitudinal rib plate are arranged, and the second transverse rib plate and the second longitudinal rib plate are cross-arranged to form a "well"-shaped structure.

[0010] This arrangement can, on the one hand, install multiple specimens, and on the other hand, ensure the rigidity of the supporting structure to reduce the interference between multiple stress loading devices.

[0011] Furthermore, a first mounting hole is provided on the first mainboard, and the first mounting hole is used for mounting the column.

[0012] This setup makes it easy to install the columns.

[0013] Furthermore, a third mounting hole is provided on the first mainboard, and the third mounting hole is used for mounting the stress loading device.

[0014] This arrangement facilitates installation of a stress loading device.

[0015] Furthermore, a second mounting hole is provided on the second mainboard, and the second mounting hole matches with the first mounting hole.

[0016] Furthermore, a card slot is provided on the second main board, and a central symmetric plane of the card slot along the setting direction of the second transverse rib plate coincides with a plate thickness central plane of the second longitudinal rib plate.

[0017] Furthermore, the column includes a supporting section, a fastening section is arranged on the supporting section, and the fastening section cooperates with the fastener.

[0018] In a second aspect of the present invention, a design method for the multi-specimen stress loading support structure is provided. The design method for the multi-specimen stress loading support structure is used to design any one of the multi-specimen stress loading support structures. The design method for the multi-specimen stress loading support structure comprises the following steps:

[0019] S1. Determine the design target parameters and determine N min , P max and v max , N min is the minimum number of stress loading devices installed, P max is the maximum value of the loading force P generated by a single stress loading device; v max The loading force generated by a single stress loading device is P max When the load force generated is P max The stress loading device adjacent to the stress loading device is a test target device, and the maximum value of the relative deformation displacement between the installation position of the test target device on the beam and the card slot position corresponding to the test target device;

[0020] S2, determine the length H1 of the support section of the column, the radius R2 of the support section and the radius R3 of the fastening section of the column;

[0021] S3, determining the plate thickness center spacing l1 between adjacent first transverse ribs, the plate thickness center spacing l1 between adjacent first longitudinal ribs, the plate thickness center spacing l1 between adjacent second transverse ribs, and the plate thickness center spacing l1 between adjacent second longitudinal ribs;

[0022] S4, determine the number n of basic structural units in the middle of the multi-specimen stress loading support structure, determine the number N of stress loading devices that can be installed, determine the thickness T1 of the first main board, determine the distance D1 from the center of the first mounting hole on the end of the multi-specimen stress loading support structure to the edge of the first main board along the direction of the first longitudinal rib plate, determine the distance D2 from the center of the first mounting hole on the end to the edge of the first main board along the direction of the first transverse rib plate, determine the distance D3 from the center of the first mounting hole on the end to the edge of the first transverse rib plate whose plate thickness centerline coincides with the center of the first mounting hole, determine the distance D4 from the edge of the first transverse rib plate whose plate thickness centerline coincides with the center of the first mounting hole to the plate thickness center of the nearest adjacent first transverse rib plate, determine the length L1 of the first main board, the width W1 of the first main board, the thickness t1 of the first transverse rib plate, the first longitudinal rib plate, the second transverse rib plate, and the second longitudinal rib plate, determine the height h1 of the first transverse rib plate, the first longitudinal rib plate, the second transverse rib plate, and the second longitudinal rib plate, and the size of the third mounting hole of the stress loading device on the first main board;

[0023] S5, determining the slot thickness d1 of the slot, the thickness T2 of the second main board, the slot width w1 of the slot, the slot cavity width w2 of the slot, and the slot cavity depth d2 of the slot, and the remaining dimensional parameters of the base are the same as the corresponding dimensional parameters of the beam;

[0024] S6. Determine the length H2 of the fastening section of the column, the size of the first thread of the fastening section, and the size of the second thread of the fastener.

[0025] The present invention proposes a multi-specimen stress loading support structure and a design method. Compared with the prior art, the multi-specimen stress loading support structure and a design method of the present invention have the following beneficial effects:

[0026] 1) A multi-specimen stress loading support structure and design method described in the present invention can install multiple stress loading devices and specimens that can independently apply loads.

[0027] 2) The multi-specimen stress loading support structure and design method described in the present invention ensure the rigidity of the support structure to reduce the interference between multiple stress loading devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of a beam of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0030] Figure 3 It is a front view of a crossbeam of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0031] Figure 4 A top view of a crossbeam of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the three-dimensional structure of a base of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0033] Figure 6 A front view of a base of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0034] Figure 7 A top view of a base of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0035] Figure 8 It is a left view of a base of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of a column of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0037] Fig.10 It is a front view of a column of a multi-specimen stress loading support structure according to an embodiment of the present invention;

[0038] Fig.11 A top view of a column of a multi-specimen stress loading support structure according to an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Beam; 11. First main board; 12. First transverse rib plate; 13. First longitudinal rib plate; 14. First mounting hole; 15. Third mounting hole; 2. Base; 21. Second main board; 22. Second transverse rib plate; 23. Second longitudinal rib plate; 24. Second mounting hole; 25. Slot; 3. Column; 31. Support section; 32. Fastening section; 33. Fastener; 4. Stress loading device; 5. Test specimen; 601. Middle part; 602. End part. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The descriptions of "first", "second", etc. mentioned in the embodiments of the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0043] The present invention proposes a multi-specimen stress loading support structure, such as Figures 1 to 11As shown, the multi-specimen stress loading support structure is composed of a crossbeam 1, a base 2 and a column 3, and the stiffness of the multi-specimen stress loading support structure is determined by the crossbeam 1, the column 3 and the base 2. The crossbeam 1 is connected to the base 2 through the column 3, and a plurality of stress loading devices 4 are installed on the crossbeam 1. The stress loading devices 4 are used to apply various force loads to the samples 5. The stress loading devices 4 correspond to the samples 5 one by one. A card slot 25 is arranged on the base 2, and the card slot 25 is engaged with the sample 5. The sample 5 corresponds to the card slot 25 one by one. The crossbeam 1 includes a first main board 11, and a first transverse rib plate 12 and a first longitudinal rib plate 13 are arranged on the first main board 11. The first transverse rib plate 12 and the first longitudinal rib plate 13 are cross-arranged to form a "well"-shaped structure.

[0044] The multi-specimen stress loading support structure described in the present invention can, on the one hand, install multiple stress loading devices 4 and specimens 5 that can independently apply loads, and on the other hand, ensure the rigidity of the support structure to reduce the interference between the multiple stress loading devices 4.

[0045] Specifically, Figure 1 , Figure 5 and Figure 7 As shown, the base 2 includes a second main board 21, on which a second transverse rib plate 22 and a second longitudinal rib plate 23 are arranged, and the second transverse rib plate 22 and the second longitudinal rib plate 23 are cross-arranged to form a "well"-shaped structure.

[0046] This arrangement can, on the one hand, install multiple specimens 5 , and on the other hand, ensure the rigidity of the supporting structure to reduce the interference between multiple stress loading devices 4 .

[0047] Specifically, Figure 2 As shown, a first mounting hole 14 is provided on the first main board 11 , and the first mounting hole 14 is used for mounting the column 3 .

[0048] This arrangement facilitates installation of the column 3 .

[0049] Specifically, Figure 2 As shown, a third mounting hole 15 is provided on the first mainboard 11 , and the third mounting hole 15 is used for mounting the stress loading device 4 .

[0050] This arrangement facilitates installation of the stress loading device 4 .

[0051] Specifically, Figure 5 and Figure 7 As shown, a second mounting hole 24 is provided on the second main board 21 , and the second mounting hole 24 is used for mounting the column 3 , and the second mounting hole 24 matches with the first mounting hole 14 .

[0052] Specifically, Figure 5 As shown, a card slot 25 is provided on the second main board 21 , and the central symmetric plane of the card slot 25 along the setting direction of the second transverse rib plate 22 coincides with the plate thickness central plane of the second longitudinal rib plate 23 .

[0053] Specifically, Figure 4 As shown, the first mounting holes 14 are symmetrically arranged along the length direction of the first main board 11. Figure 7 As shown, the second mounting holes 24 are symmetrically arranged along the length direction of the second main board 21. This arrangement can ensure the rigidity of the supporting structure.

[0054] Specifically, Figure 4 As shown, the third mounting hole 15 is arranged near the intersection of the first transverse rib plate 12 and the first longitudinal rib plate 13. This arrangement facilitates the support structure to provide rigid support to the stress loading device 4.

[0055] Specifically, Fig. 9 and Fig.10 As shown, the column 3 includes a supporting section 31 , on which a fastening section 32 is arranged, and the fastening section 32 cooperates with a fastener 33 .

[0056] This arrangement can provide installation and testing space for the stress loading device 4 and the test specimen 5 and ensure the rigidity of the supporting structure.

[0057] More specifically, Fig. 9 and Fig.10 As shown, fastening sections 32 are provided at the upper and lower ends of the support section 31. The fastening section 32 at the upper end passes through the first mounting hole 14 and is fixed to the first main board 11 of the beam 1 by means of fasteners 33, and the fastening section 32 at the lower end passes through the second mounting hole 24 and is fixed to the second main board 21 of the base 2 by means of fasteners 33.

[0058] The card slot 25 is configured as an inverted "T"-shaped structure. The upper end of the card slot 25 is a card slot, and the lower end of the card slot 25 is a slot cavity.

[0059] Specifically, the material of the crossbeam 1 is not limited.

[0060] More specifically, the cross beam 1 is made of steel with a yield strength of not less than 235 MPa, and the first main plate 11, the first transverse rib plate 12 and the first longitudinal rib plate 13 are connected into one by welding; the stress loading device 4 is installed on the first main plate 11 by bolt connection. This arrangement can ensure the rigidity of the supporting structure.

[0061] Specifically, the material of the base 2 is not limited.

[0062] More specifically, the base 2 is made of steel with a yield strength of not less than 235 MPa, and the second main plate 21, the second transverse rib plate 22 and the second longitudinal rib plate 23 are connected into one body by welding. This arrangement can ensure the rigidity of the support structure.

[0063] The sample 5 is clamped with the clamping slot 25 through a sample fixture, and the clamping slot 25 is in a T-shaped structure.

[0064] The fastener 33 is configured as a fastening nut, a first thread is configured on the outer side of the fastening section 32, a second thread is configured on the inner side of the fastener 33, and a second thread is configured on the inner side of the fastening nut, and the first thread matches the second thread. The support section 31 and the fastening section 32 are formed by machining from a single piece of material, and the material is steel with a yield strength of not less than 235 MPa. This configuration can ensure the rigidity of the support structure.

[0065] The multi-specimen stress loading support structure proposed in the present invention can be divided into a middle part 601 and two end parts 602 along the length direction (called longitudinal direction). The basic structural unit of the middle part 601 can be installed with 12 stress loading devices 4. The basic structural unit of the middle part 601 is composed of a pair of columns 3 and a beam 1 of corresponding width and a base 2. The basic structural unit can be determined according to the number of stress loading devices 4 that need to be installed; the structural unit of the end part 602 is composed of a pair of columns 3 and a beam 1 of a certain width and a base 2. The structural unit of the end part 602 can be installed with 8 stress loading devices 4.

[0066] The stress loading device 4 can provide a variety of force loads, including constant total strain, constant load, slow strain rate load and alternating cycle load.

[0067] In the multi-sample stress loading support structure described in the present invention, the minimum number of installations of the stress loading device 4 is N min Satisfy: N min ≥16; the maximum value P of the loading force generated by each stress loading device 4 max (Unit: Newton); the loading force generated by a stress loading device 4 is P max When the load force generated is P max The stress loading device 4 adjacent to the stress loading device 4 is the test target device, and the maximum value v of the relative deformation displacement between the installation position of the test target device on the beam 1 and the position of the card slot 25 corresponding to the test target device max (Unit: mm).

[0068] In the multi-sample stress loading support structure described in the present invention, the number N of stress loading devices 4 that can be installed is not less than the corresponding target parameter N min ; The loading force P generated by a single stress loading device 4 is not greater than the maximum value Pmax ; At the same time, the loading force generated by the single stress loading device 4 is P max When the load force generated is P max The stress loading device 4 adjacent to the stress loading device 4 is the test target device, and the maximum value v of the relative deformation displacement between the installation position of the test target device on the beam 1 and the position of the card slot 25 corresponding to the test target device max (Unit: mm).

[0069] The thickness T1 (unit: mm) of the first main board 11 must satisfy the relationship shown in formula (1);

[0070]

[0071] This arrangement can ensure the rigidity of the crossbeam 1 in the supporting structure.

[0072] The length L1 (unit: mm) of the first main board 11, the center spacing l1 (unit: mm) between the thickness of two adjacent first longitudinal ribs 13, and the distance D1 (unit: mm) from the center of the first mounting hole 14 on the end 602 along the direction of the first longitudinal rib 13 to the edge of the first main board 11 must satisfy the relationship shown in formula (2), where n is Figure 1 The number of basic structural units of the middle portion 601 is a positive integer.

[0073] L1=3(n+1)·l1+2D1 (2).

[0074] This arrangement can ensure the rigidity of the supporting structure and ensure sufficient installation space for the columns 3 .

[0075] The number n of basic structural units of the middle part 601 and the minimum number N of stress loading devices 4 to be installed min Satisfies the relationship shown in formula (3):

[0076]

[0077] This arrangement can ensure that the number of installed stress loading devices 4 meets the design requirements.

[0078] The number N of stress loading devices 4 that can be installed satisfies the relationship shown in formula (4):

[0079] N=12n+16 (4).

[0080] This arrangement can ensure that the number of installed stress loading devices 4 meets the design requirements.

[0081] The width W1 of the first main board 11, the center spacing l1 of the plate thickness between two adjacent first longitudinal ribs 13, the distance D2 (unit: mm) from the center of the first mounting hole 14 on the end 602 to the edge of the first main board 11 along the direction of the first transverse rib 12, the distance D3 (unit: mm) from the center of the first mounting hole 14 on the end 602 to the edge of the first transverse rib 12 whose plate thickness center line coincides with the center of the first mounting hole 14, and the distance D4 (unit: mm) from the edge of the first transverse rib 12 whose plate thickness center line coincides with the center of the first mounting hole 14 to the plate thickness center of the nearest adjacent first transverse rib 12 shall satisfy the relationship shown in formula (5):

[0082] W1=3l1+2(D2+D3+D4) (5).

[0083] This arrangement can ensure the rigidity of the supporting structure and that the stress loading device 4 has sufficient installation space.

[0084] The distance D1 from the center of the first mounting hole 14 on the end 602 to the edge of the first main board 11 along the direction of the first longitudinal rib plate 13 and the center distance l1 of the plate thickness between two adjacent first longitudinal rib plates 13 must satisfy the relationship shown in formula (6):

[0085] 1.5l1≤D1≤2.5l1 (6).

[0086] This arrangement can ensure the rigidity of the supporting structure.

[0087] The distance D2 from the center of the first mounting hole 14 on the end 602 to the edge of the first main board 11 along the direction of the first transverse rib plate 12 and the radius R2 (unit: mm) of the support section 31 must satisfy the relationship shown in formula (7):

[0088] 2.0R2≤D2≤2.5R2 (7).

[0089] This arrangement can ensure the rigidity of the supporting structure.

[0090] The distance D3 from the center of the first mounting hole 14 on the end 602 to the edge of the first transverse rib plate 12 where the center line of the plate thickness coincides with the center of the first mounting hole 14 and the radius R2 of the support section 31 must satisfy the relationship shown in formula (8):

[0091] 1.2R2≤D3≤1.5R2 (8).

[0092] This arrangement can ensure the rigidity of the supporting structure.

[0093] The distance D4 from the edge of the first transverse rib plate 12 where the center line of the plate thickness coincides with the center of the first mounting hole 14 to the center of the plate thickness of the nearest first transverse rib plate 12 and the center distance l1 of the plate thickness between two adjacent first longitudinal rib plates 13 must satisfy the relationship shown in formula (9):

[0094] 0.5l1≤D4≤1.0l1 (9).

[0095] This arrangement can ensure the rigidity of the supporting structure.

[0096] The thickness of the first longitudinal rib plate 13 is the same as the thickness of the first transverse rib plate 12 and is represented by t1. The thickness t1 (unit: mm) of the first longitudinal rib plate 13 and the thickness T1 of the first main plate 11 must satisfy the relationship shown in formula (10):

[0097] 0.4T1≤t1≤0.6T1 (10).

[0098] This arrangement can ensure the rigidity of the supporting structure.

[0099] The height of the first longitudinal rib plate 13 is the same as the height of the first transverse rib plate 12 and is represented by h1. The height h1 (unit: mm) of the first longitudinal rib plate 13 and the thickness t1 of the first longitudinal rib plate 13 must satisfy the relationship shown in formula (11):

[0100] 6t1≤h1≤10t1 (11).

[0101] This arrangement can ensure the rigidity of the supporting structure.

[0102] The center spacing of the plate thickness of the first longitudinal rib plate 13 is the same as the center spacing of the plate thickness of the first transverse rib plate 12, and both are represented by l1. The center spacing of the plate thickness of the first longitudinal rib plate 13 l1 must satisfy the relationship shown in formula (12):

[0103] 200≤l1≤300 (12).

[0104] This arrangement can ensure the rigidity of the supporting structure.

[0105] The radius R1 (unit: mm) of the first mounting hole 14 and the radius R3 (unit: mm) of the fastening section 32 must satisfy the relationship shown in formula (13):

[0106] 1.01R3≤R1≤1.05R3 (13).

[0107] This arrangement can ensure the connection strength between the column 3 and the beam 1 .

[0108] The length and width of the second main board 21 of the base 2 are consistent with the length and width of the first main board 11 .

[0109] The thickness and height of the second transverse rib plate 22 and the second longitudinal rib plate 23 of the base 2 are consistent with the thickness and height of the first transverse rib plate 12 and the first longitudinal rib plate 13 .

[0110] The spacing and relative position between the second transverse rib plate 22 and the second longitudinal rib plate 23 of the base 2 are consistent with the spacing and relative position between the first transverse rib plate 12 and the first longitudinal rib plate 13 .

[0111] The thickness T2 (unit: mm) of the second main board 21, the thickness T1 of the first main board 11, and the thickness d1 (unit: mm) of the card slot 25 must satisfy the relationship shown in formula (14):

[0112] T2 = T1 + d1 (14).

[0113] This arrangement can ensure the rigidity of the supporting structure.

[0114] The width w1 (unit: mm) of the slot 25 and the thickness of the rib plate must satisfy the relationship shown in formula (15):

[0115] 0.8t1≤w1≤1.5t1 (15).

[0116] This arrangement can ensure effective engagement between the sample fixture and the engagement slot 25 .

[0117] The width w2 (unit: mm) of the slot 25 and the thickness t1 of the first longitudinal rib plate 13 must satisfy the relationship shown in formula (16):

[0118] 2t1≤w2≤3t1 (16).

[0119] This arrangement can ensure effective engagement between the sample fixture and the engagement slot 25 .

[0120] The thickness d1 of the card slot 25 and the thickness T1 of the first main board 11 must satisfy the relationship shown in formula (17):

[0121] 0.15T1≤d1≤0.25T1 (17).

[0122] This arrangement can ensure effective engagement between the sample fixture and the engagement slot 25 .

[0123] The depth d2 (unit: mm) of the slot 25 and the thickness T1 of the first main board 11 must satisfy the relationship shown in formula (18):

[0124] 0.2T1≤d2≤0.3T1 (18).

[0125] This arrangement can ensure effective engagement between the sample fixture and the engagement slot 25 .

[0126] The radius R2 of the support section 31 and the length H1 (unit: mm) of the support section 31 must satisfy the relationship shown in formula (19):

[0127]

[0128] This arrangement can ensure the rigidity of the supporting structure.

[0129] The length H1 of the support section 31 must satisfy the relationship shown in formula (20):

[0130] 600≤H1≤1500 (20).

[0131] This arrangement can ensure that installation and testing space is provided for the stress loading device 4 and the sample 5, and the rigidity of the supporting structure is ensured.

[0132] The radius R3 of the fastening section 32 and the radius R2 of the supporting section 31 are related as shown in formula (21):

[0133] 0.5R2≤R3≤0.7R2 (21).

[0134] This arrangement can ensure the connection strength between the column 3 and the beam 1 and the base 2.

[0135] The length H2 (unit: mm) of the fastening section 32, the thickness T2 of the second main board 21, and the radius R3 of the fastening section 32 must satisfy the relationship shown in formula (22):

[0136] T2+2.5R3≤H2≤T2+3.5R3 (22).

[0137] This arrangement can ensure the connection strength between the column 3 and the beam 1 and the base 2.

[0138] In a second aspect of the present invention, a design method for a multi-specimen stress loading support structure is further provided. The design method for a multi-specimen stress loading support structure is used to design any one of the multi-specimen stress loading support structures described above. The design method for a multi-specimen stress loading support structure comprises the following steps:

[0139] S1. Determine the design target parameters and determine N min , P max and v max , N min is the minimum number of stress loading devices 4 to be installed;

[0140] S2, determining the length H1 of the support section 31 of the column 3, the radius R2 of the support section 31 and the radius R3 of the fastening section 32 of the column 3;

[0141] S3, determining the plate thickness center spacing l1 between the adjacent first transverse rib plate 12, the first longitudinal rib plate 13, the second transverse rib plate 22, and the second longitudinal rib plate 23;

[0142] S4, determine the number n of basic structural units in the middle part 601 of the multi-specimen stress loading support structure, determine the number N of stress loading devices 4 that can be installed, determine the thickness T1 of the first main board 11, determine the distance D1 from the center of the first mounting hole 14 on the end 602 of the multi-specimen stress loading support structure to the edge of the first main board 11 along the direction of the first longitudinal rib plate 13, determine the distance D2 from the center of the first mounting hole 14 on the end 602 to the edge of the first main board 11 along the direction of the first transverse rib plate 12, determine the distance D3 from the center of the first mounting hole 14 on the end 602 to the center line of the plate thickness and the center weight of the first mounting hole 14 Determine the distance D3 from the edge of the first transverse rib plate 12 where the center line of the plate thickness coincides with the center of the first mounting hole 14 to the center of the plate thickness of the nearest adjacent first transverse rib plate 12, determine the length L1 of the first main board 11, determine the width W1 of the first main board 11, determine the thickness t1 of the first transverse rib plate 12, the first longitudinal rib plate 13, the second transverse rib plate 22, and the second longitudinal rib plate 23, determine the height h1 of the first transverse rib plate 12, the first longitudinal rib plate 13, the second transverse rib plate 22, and the second longitudinal rib plate 23, and determine the size of the third mounting hole 15 of the stress loading device 4 on the first main board 11;

[0143] S5, determining the bayonet thickness d1 of the slot 25, the thickness T2 of the second main board 21, the bayonet width w1 of the slot 25, the slot cavity width w2 of the slot 25, and the slot cavity depth d2 of the slot 25, and the remaining dimensional parameters of the base 2 are the same as the corresponding dimensional parameters of the beam 1;

[0144] S6. Determine the length H2 of the fastening section 32 of the column 3, the size of the first thread of the fastening section 32, and the size of the second thread of the fastener 33.

[0145] More specifically, the design method of the multi-specimen stress loading support structure includes the following steps:

[0146] S1. Design target parameters to determine the minimum number of stress loading devices 4 to be installed N min ; The maximum value P of the loading force generated by the single stress loading device 4 max ; The loading force generated by the single stress loading device 4 is P max When the load force generated is P max The stress loading device 4 adjacent to the stress loading device 4 is the test target device, and the maximum value v of the relative deformation displacement between the installation position of the test target device on the beam 1 and the position of the card slot 25 corresponding to the test target device max .

[0147] S2. Determine the length H1 of the support section 31 of the column 3 according to formula (20), determine the radius R2 of the support section 31 of the column 3 according to formula (19), and determine the radius R3 of the fastening section 32 of the column 3 according to formula (21).

[0148] S3. Determine the plate thickness center spacing l1 between the adjacent first transverse rib plate 12, first longitudinal rib plate 13, second transverse rib plate 22, and second longitudinal rib plate 23 according to formula (12).

[0149] S4, according to formula (3), the number n of basic structural units of the middle part 601 is calculated and determined, according to formula (4), the number N of stress loading devices 4 that can be installed is calculated and determined, according to formula (1), the thickness T1 of the first main board 11 is calculated and determined, according to formula (6), the distance D1 from the center of the first mounting hole 14 on the end 602 to the edge of the first main board 11 along the direction of the first longitudinal rib plate 13 is calculated and determined, according to formula (7), the distance D2 from the center of the first mounting hole 14 on the end 602 to the edge of the first main board 11 along the direction of the first transverse rib plate 12 is calculated and determined, according to formula (8), the distance D3 from the center of the first mounting hole 14 on the end 602 to the edge of the first transverse rib plate 12 where the center line of the plate thickness coincides with the center of the first mounting hole 14 is calculated, according to formula (9), Determine the distance D4 from the edge of the first transverse rib plate 12 whose plate thickness centerline coincides with the center of the first mounting hole 14 to the plate thickness center of the nearest adjacent first transverse rib plate 12; calculate and determine the length L1 of the first main plate 11 according to formula (2); calculate and determine the width W1 of the first main plate 11 according to formula (5); calculate and determine the thickness t1 of the first transverse rib plate 12, the first longitudinal rib plate 13, the second transverse rib plate 22, and the second longitudinal rib plate 23 according to formula (10); calculate and determine the height h1 of the first transverse rib plate 12, the first longitudinal rib plate 13, the second transverse rib plate 22, and the second longitudinal rib plate 23 according to formula (11); thereby completing the design of the structural dimension parameters of the beam 1; the size of the third mounting hole 15 of the stress loading device 4 on the first main plate 11 is determined according to the specific stress loading device 4.

[0150] S5. The thickness d1 of the card slot 25 is calculated and determined according to formula (17), the thickness T2 of the second main board 21 is calculated and determined according to formula (14), the width w1 of the card slot 25 is calculated and determined according to formula (15), the width w2 of the slot 25 is calculated and determined according to formula (16), and the depth d2 of the slot 25 is calculated and determined according to formula (18). The remaining dimensional parameters of the base 2 are the same as the corresponding dimensional parameters of the beam 1, thereby completing the design of the dimensional parameters of the base 2.

[0151] S6. Calculate and determine the length H2 of the fastening section 32 of the column 3 according to formula (22), thereby completing the design of the dimensional parameters of the column 3; the thread and fastening nut of the fastening section 32 of the column 3 are determined according to the corresponding standards.

[0152] As shown in Table 1, according to the design method of the multi-specimen stress loading support structure, five multi-specimen stress loading support structures with different target parameters are designed, namely, Example 1, Example 2, Example 3, Example 4 and Example 5, and the size and structure design data of the multi-specimen stress loading support structure of each embodiment are shown in Table 1. The materials of the beam 1 and the base 2 of all embodiments are steel plates with a grade of E32 (yield strength of 340 MPa to 380 MPa), and the materials of the columns 3 are forged steel with a grade of 40Cr (yield strength of 350 MPa to 420 MPa).

[0153] The loading force generated by a single stress loading device 4 is P max When the load force generated is P max The stress loading device 4 adjacent to the stress loading device 4 is the test target device. The test method for the relative deformation displacement v between the installation position of the test target device on the crossbeam 1 and the position of the card slot 25 corresponding to the test target device can use the existing technology method, or can use the following method for testing: install a stress loading device 4 containing a specimen 5 and equipped with pressure monitoring and control at any installation point between the two installation positions of the stress loading device 4 at any position along the longitudinal rib plate direction and in the middle along the transverse rib plate direction of the crossbeam 1 and the base 2; install a stress loading device 4 adjacent to the loading position and along the transverse rib plate direction; install a stress loading device 4 containing a specimen 5 and equipped with pressure monitoring and control at any installation point adjacent to the loading position and along the transverse rib plate direction. A round bar with a diameter of not less than 10 mm and high coaxiality is installed on the beam 1 and the base 2 at the edge loading point respectively. The length of the round bar should be long enough. After installation, the distance between the relative end faces of the two round bars is controlled between 1 mm and 5 mm, and the center axes of the two round bars are overlapped as much as possible; an extensometer is installed near the relative end faces of the two round bars so that the extensometer spans the gap between the two round bars to measure the relative deformation between the two round bars, that is, to measure the deformation between the beam 1 and the base 2 at the loading point; the stress loading device 4 is controlled to make the loading force reach the maximum value P max , measure the relative deformation of beam 1 and base 2 at adjacent loading point positions. The test data of the relative deformation of beam 1 and base 2 at adjacent loading point positions of five multi-specimen stress loading support structures under the condition that a single stress loading device generates 4 maximum loading forces are shown in Table 1.

[0154] Table 1 Dimensions of the stress loading support structure for multiple specimens in various embodiments

[0155]

[0156]

[0157]

[0158] It can be seen from Table 1 that all five embodiments meet the design target parameter requirements, that is, the relative deformation test value v of the beam 1 and the base 2 at adjacent loading points under the maximum loading force of the single stress loading device 4 is less than the design target value v max .

[0159] The multi-specimen stress loading support structure and design method described in the present invention can, on the one hand, install multiple stress loading devices 4 and specimens 5 that can independently apply loads, and on the other hand, ensure the rigidity of the support structure to reduce the interference between the multiple stress loading devices 4.

[0160] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A multi-specimen stress loading support structure, characterized in that: The multi-specimen stress loading support structure comprises a crossbeam (1), a base (2) and a column (3), wherein the crossbeam (1) is connected to the base (2) via the column (3), and a plurality of stress loading devices (4) are installed on the crossbeam (1), wherein the stress loading devices (4) are used to apply a plurality of force loads to the specimens (5), wherein the stress loading devices (4) correspond one-to-one with the specimens (5), and a clamping groove (25) is arranged on the base (2), wherein the clamping groove (25) is clamped with the specimens (5), and wherein the specimens (5) correspond one-to-one with the clamping groove (25), and wherein the crossbeam (1) comprises a first main board (11), wherein a first transverse rib plate (12) and a first longitudinal rib plate (13) are arranged on the first main board (11), wherein the first transverse rib plate (12) and the first longitudinal rib plate (13) are cross-arranged to form a "well"-shaped structure; The base (2) comprises a second main board (21), on which a second transverse rib plate (22) and a second longitudinal rib plate (23) are arranged, and the second transverse rib plate (22) and the second longitudinal rib plate (23) are arranged crosswise to form a "well"-shaped structure; A first mounting hole (14) is provided on the first main board (11), wherein the first mounting hole (14) is used for mounting the column (3); A third mounting hole (15) is provided on the first main board (11), wherein the third mounting hole (15) is used for mounting a stress loading device (4); A second mounting hole (24) is provided on the second main board (21), the second mounting hole (24) being matched with the first mounting hole (14) for mounting the column (3); A card slot (25) is provided on the second main plate (21), wherein a central symmetric plane of the card slot (25) along the direction in which the second transverse rib plate (22) is provided coincides with a plate thickness central plane of the second longitudinal rib plate (23); The column (3) comprises a supporting section (31), a fastening section (32) is arranged on the supporting section (31), and the fastening section (32) cooperates with a fastener (33); The design method of the multi-specimen stress loading support structure comprises the following steps: S1. Determine the design target parameters and determine N min , P max and v max , N min is the minimum number of stress loading devices (4) to be installed, P max is the maximum value of the loading force P generated by a single stress loading device (4); v max The loading force generated by the single stress loading device (4) is P max When the load force generated is P max The stress loading device (4) adjacent to the stress loading device (4) is a test target device, and the maximum value of the relative deformation displacement between the installation position of the test target device on the beam (1) and the position of the card slot (25) corresponding to the test target device; S2, determining the length H1 of the support section (31) of the column (3), the radius R2 of the support section (31), and the radius R3 of the fastening section (32) of the column (3); S3, determining the plate thickness center spacing between adjacent first transverse rib plates (12), the plate thickness center spacing between adjacent first longitudinal rib plates (13), the plate thickness center spacing between adjacent second transverse rib plates (22), and the plate thickness center spacing between adjacent second longitudinal rib plates (23); S4, determining the number n of basic structural units in the middle part (601) of the multi-specimen stress loading support structure, determining the number N of stress loading devices (4) that can be installed, determining the thickness T1 of the first main board (11), determining the distance D1 from the center of the first mounting hole (14) on the end (602) of the multi-specimen stress loading support structure to the edge of the first main board (11) along the direction of the first longitudinal rib plate (13), determining the distance D2 from the center of the first mounting hole (14) on the end (602) to the edge of the first main board (11) along the direction of the first transverse rib plate (12), determining the distance from the center of the first mounting hole (14) on the end (602) to the center line of the plate thickness that coincides with the center of the first mounting hole (14), and determining the distance D3 from the center of the first mounting hole (14) on the end (602) to the center line of the plate thickness that coincides with the center of the first mounting hole (14). a distance D3 from the edge of a transverse rib plate (12), determining a distance D4 from the edge of the first transverse rib plate (12) whose plate thickness centerline coincides with the center of the first mounting hole (14) to the plate thickness center of the nearest first transverse rib plate (12), determining a length L1 of the first main plate (11), determining a width W1 of the first main plate (11), determining a thickness t1 of the first transverse rib plate (12), the first longitudinal rib plate (13), the second transverse rib plate (22), and the second longitudinal rib plate (23), determining a height h1 of the first transverse rib plate (12), the first longitudinal rib plate (13), the second transverse rib plate (22), and the second longitudinal rib plate (23), and determining a size of a third mounting hole (15) of a stress loading device (4) on the first main plate (11); S5, determining the slot thickness d1 of the slot (25), the thickness T2 of the second main board (21), the slot width w1 of the slot (25), the slot cavity width w2 of the slot (25), and the slot cavity depth d2 of the slot (25), and the remaining dimensional parameters of the base (2) are the same as the corresponding dimensional parameters of the crossbeam (1); S6. Determine the length H2 of the fastening section (32) of the column (3), the size of the first thread of the fastening section (32), and the size of the second thread of the fastening member (33).

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