CN217033349U - A mix atress mode mechanical test anchor clamps for U type sample - Google Patents
A mix atress mode mechanical test anchor clamps for U type sample Download PDFInfo
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- CN217033349U CN217033349U CN202123228820.0U CN202123228820U CN217033349U CN 217033349 U CN217033349 U CN 217033349U CN 202123228820 U CN202123228820 U CN 202123228820U CN 217033349 U CN217033349 U CN 217033349U
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Abstract
The utility model discloses a mechanical test fixture for a mixed stress mode of a U-shaped test sample, which comprises a supporting plate, a lower supporting plate, an upper chuck and a lower chuck; the upper supporting disc and the lower supporting disc are in a fan-shaped structure and are composed of right-angle edges and arc-shaped edges; a sample mounting groove is arranged at the right-angle edge; the sample to be tested is placed in the sample mounting groove and is fixedly connected with the upper support disc 3 and the lower support disc through the connecting piece; the arc edges of the upper supporting disc and the lower supporting disc which are fixedly connected by the sample to be tested are positioned on the same arc, and the arc edges of the upper supporting disc and the lower supporting disc are respectively and fixedly connected with the upper chuck and the lower chuck; the mounting positions of the upper chuck and the lower chuck on the upper supporting disk and the lower supporting disk are changed, and the angle between the upper chuck and the lower chuck is adjusted. The included angle that this application designed can adapt to mixed atress mode mechanical test under the multi-angle.
Description
Technical Field
The utility model belongs to the field of mechanical testing, and particularly relates to mechanical testing of a connection sample.
Background
Conventional flat tensile, shear characterization methods, including the V-notch rail shear test (ASTM D7078-12), the Iosiescu shear test (ASTM D5379-12), and the + -45 ° tensile test (ASTM D3518/D3518M) all have some potential drawbacks. The shear modulus G is measured by experiment12、G21、G31、G32Longitudinal modulus (G) was found12、G21、G31、G31) The error of (2) is 1%. The tensile and shear properties obtained in the test based on the U-shaped test specimen are therefore more reliable than in other corresponding test methods, since there is no interaction of stresses.
In addition to placing loads on various types of composite materials, the fixture is also used for many quasi-static tests and studies of delamination. In addition, the fixture has bright prospect in applying the biaxial fatigue load of normal stress and shear stress, and compared with the biaxial normal fatigue research using a cross-shaped sample, the related research using a U-shaped sample is less.
In addition, in recent years, the development of CAE technology is rapid, common connection technologies such as bonding, riveting and resistance spot welding are increasingly simulated by using finite element models, and load-displacement curves under different loading forces can be acquired by using the fixture, so that the finite element models of the connection joints are aligned to verify the accuracy of the models.
In consideration of the importance of the mixed stress mode mechanical test, a mixed stress mode mechanical test fixture for a U-shaped test sample needs to be designed.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiency that exists among the prior art, this application has designed a mixed atress mode mechanical testing anchor clamps for U type sample, and this anchor clamps can adapt to mixed atress mode mechanical testing under the multi-angle.
The technical scheme adopted by the utility model is as follows:
a mechanical test fixture in a mixed stress mode for a U-shaped test sample comprises a supporting plate, a lower supporting plate, an upper chuck and a lower chuck; the upper supporting disc and the lower supporting disc are of fan-shaped structures and are composed of right-angle edges and arc-shaped edges; a sample mounting groove is arranged at the right-angle side; the sample to be tested is placed in the sample mounting groove and is fixedly connected with the upper support disc 3 and the lower support disc through the connecting piece;
the arc edges of the upper supporting disc and the lower supporting disc which are fixedly connected by the sample to be tested are positioned on the same arc, and the arc edges of the upper supporting disc and the lower supporting disc are respectively and fixedly connected with the upper chuck and the lower chuck; the mounting positions of the upper chuck and the lower chuck on the upper supporting disc and the lower supporting disc are changed, the angle between the upper chuck and the lower chuck is adjusted, and loads in different directions are loaded on a sample to be tested.
Further, the upper support disc and the lower support disc are rotationally symmetric about a central point.
And furthermore, sample connecting holes are formed in the sample mounting grooves of the upper supporting disc and the lower supporting disc, and a sample to be tested is fixedly connected with the sample connecting holes through fasteners.
Furthermore, a plurality of chuck connecting holes are formed in the arc-shaped edge positions of the upper supporting disc and the lower supporting disc along the circumferential direction; the upper chuck and the lower chuck are also provided with the same chuck connecting holes, and the upper chuck and the lower chuck are respectively fixedly connected with the upper supporting disc and the lower supporting disc through fasteners.
Furthermore, the intersection of a right-angle edge and an arc edge of the upper supporting disc and the lower supporting disc extends outwards along the arc where the arc edge is located, a chuck connecting hole is also formed in the extending position, and the installation range of the upper chuck and the lower chuck is enlarged through the opposite extending portions.
Further, the upper chuck and the lower chuck have the same structure and are both fan-shaped; and a connecting part is arranged in the middle of the fan shape along the radial direction and is connected with the testing machine.
Furthermore, the sample to be measured is a U-shaped sample and is formed by welding, bonding or riveting two U-shaped pieces.
The utility model has the beneficial effects that:
1. the utility model improves the test pure shearing and in-plane shearing/normal stress combined mode, takes a U-shaped sample as a standard, and designs a set of mixed stress mode mechanical test fixture special for the test of the sample at 0 degree, 30 degrees, 60 degrees and 90 degrees.
2. The clamp can measure the shear strength of the welding spot of the U-shaped spot welding sample, can also measure the tensile strength of the welding spot, and is wider in application range; in addition, the clamp can also be used for tensile and shear tests of different connection technologies such as bonding, riveting and the like, and the universality of the clamp is improved.
3. The clamp has a simple structure, meets the lightweight design requirements, and can be used for a mixed stress mode mechanical test under the working condition of collision impact load under a high strain rate.
Drawings
FIG. 1 is a schematic view of a mixed stress mode mechanical test fixture;
FIGS. 2, 3 and 4 are schematic views of installation positions of the mixed stress mode mechanical test fixture at loading angles of 30 degrees, 60 degrees and 90 degrees, respectively;
FIG. 5 is an exploded view of a hybrid force mode mechanical test fixture;
in the figure, 1, an upper chuck, 2, a lower chuck, 3, an upper supporting disc, 4, a lower supporting disc and 5, a U-shaped sample.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
A mix atress mode mechanics test fixture for U type sample as shown in fig. 1 and 2, including supporting disk and chuck, the supporting disk divide into support disk 3 and lower supporting disk 4 on, the chuck divide into chuck 1 and lower chuck 2.
The upper supporting disc 3 and the lower supporting disc 4 are both of similar fan-shaped structures and are composed of right-angle edges and arc-shaped edges; the right-angle side is provided with a sample mounting groove, and a sample connecting hole is formed in the sample mounting groove. During assembly, the edge of the sample mounting groove of the upper support disc 3 and the edge of the sample mounting groove of the lower support disc 4 are mutually contacted, and the sample mounting grooves on the upper support disc 3 and the lower support disc 4 form a complete sample mounting groove; meanwhile, the arc edges of the upper support disc 3 and the lower support disc 4 after the sample to be tested is installed are positioned on the same arc.
A plurality of chuck connecting holes are formed in the arc-shaped edge positions of the upper supporting disc 3 and the lower supporting disc 4 along the circumferential direction; the upper chuck 1 and the lower chuck 2 have the same structure and are both in a fan shape, and a connecting part is arranged in the middle of the fan shape along the radial direction; the sector is also provided with a chuck connecting hole. Since the chuck connection holes of the upper and lower support disks 3 and 4 can correspond to the chuck connection holes of the upper and lower chucks 1 and 2 one by one, the upper and lower chucks 1 and 2 can be connected to the upper and lower support disks 3 and 4, respectively, through the connection member. By changing the installation positions of the upper chuck 1 and the lower chuck 2 on the upper supporting disk 3 and the lower supporting disk 4, the sample to be tested can bear loads in different directions, and further the detection of a mixed stress mode is completed.
Preferably, the upper support disc 3 and the lower support disc 4 are rotationally symmetrical about a central point.
More preferably, at the intersection of a right-angle side and the arc limit of upper supporting disk 3 and lower supporting disk 4 outwards extend along the arc line that the arc limit is located, set up the chuck connecting hole at the extension position equally, can enlarge the scope of going up chuck 1 and 2 installations of chuck down through relative extension, the more nimble angle that changes between chuck 1 and the chuck 2 down.
Preferably, the upper chuck 1 and the lower chuck 2 are clamped in the upper chuck and the lower chuck of the INSTRON electronic universal testing machine.
In this embodiment, the sample mounting groove is a rectangular groove, and the sample mounting grooves in the upper support disk 3 and the lower support disk 4 are both 1/2 rectangular grooves, and a complete sample mounting groove is obtained when the upper support disk 3 and the lower support disk 4 are spliced along the long side of the rectangular groove.
In the present embodiment, only the U-shaped test piece 5 is taken as an illustration, and the U-shaped test piece 5 is formed by welding two U-shaped pieces as shown in fig. 5. The clamp is not limited to mechanical testing of the spot welding sample of the U-shaped sample; the device can also be used for tensile and shear tests of different connection technologies such as bonding, riveting and the like.
The following will be further explained in conjunction with the use of the present clip:
in the embodiment, the U-shaped test piece 5 is prepared by spot welding, and the welding point of the U-shaped test piece 5 is positioned in the center of the bottom surfaces of 2U-shaped pieces; in this experiment, it is necessary to detect the shear strength of the weld and the tensile strength of the weld of the U-shaped sample 5.
Before the experiment begins, a U-shaped sample 5 is placed in a sample mounting groove; because two rows of sample connecting holes are also formed in the U-shaped sample 5, two sides of the U-shaped sample 5 are respectively and fixedly connected with the upper supporting disk 3 and the lower supporting disk 4 through fasteners such as bolts and the like. The fixed connection between the U-shaped test sample 5 and the upper support disc 3 and the lower support disc 4 can increase the rigidity of the contact bottom surface of the 2U-shaped pieces, so that the rotation angle of the welding point is greatly reduced, and the more real shearing strength of the welding point can be obtained.
Then, the upper and lower chucks 1 and 2 are fixedly connected to the upper and lower support disks 3 and 4, respectively, by means of a connecting member.
And (4) mounting the clamp with the U-shaped test sample 5 on a corresponding chuck of the INSTRON electronic universal testing machine for detection.
By changing the connecting positions between the upper chuck 1 and the lower chuck 2 and between the upper support disc 3 and the lower support disc 4, loads in different directions can be loaded on a sample to be tested, such as loads in the directions of 0 degrees, 30 degrees, 60 degrees and 90 degrees in fig. 1-4, the failure shear force of a welding point can be obtained through a 0-degree test, and the failure axial force of the welding point can be obtained through a 90-degree test.
The fixture is used for a spot welding lap joint pulling and shearing test, and the welding spot pulling and shearing strength measured by the test can reflect the shearing resistance of the welding spot more truly.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (7)
1. A mechanical test fixture for a U-shaped sample in a mixed stress mode is characterized by comprising an upper support plate (3), a lower support plate (4), an upper chuck (1) and a lower chuck (2); the upper supporting disc (3) and the lower supporting disc (4) are of fan-shaped structures and are composed of right-angle edges and arc-shaped edges; a sample mounting groove is arranged at the right-angle side; a sample to be tested is placed in the sample mounting groove, and the sample to be tested is fixedly connected with the upper supporting disc (3) and the lower supporting disc (4) through connecting pieces;
the arc edges of an upper supporting disc (3) and a lower supporting disc (4) which are fixedly connected by a sample to be tested are positioned on the same arc, and the arc edges of the upper supporting disc (3) and the lower supporting disc (4) are respectively and fixedly connected with an upper chuck (1) and a lower chuck (2); the mounting positions of the upper chuck (1) and the lower chuck (2) on the upper supporting disk (3) and the lower supporting disk (4) are changed, the angle between the upper chuck (1) and the lower chuck (2) is adjusted, and loads in different directions are loaded on a sample to be tested.
2. The mixed force mode mechanical test fixture for U-shaped test specimens according to claim 1, characterized in that the upper support disk (3) and the lower support disk (4) are rotationally symmetric about a central point.
3. The mixed stress mode mechanical test fixture for the U-shaped test sample according to claim 2, wherein a test sample connection hole is formed in the test sample mounting groove of the upper support plate (3) and the lower support plate (4), and the test sample to be tested is fixedly connected with the test sample connection hole through a fastener.
4. The mechanical test fixture for the mixed stress mode of the U-shaped test sample according to claim 2, wherein a plurality of chuck connecting holes are formed in the arc-shaped edge positions of the upper support plate (3) and the lower support plate (4) along the circumferential direction; the upper chuck (1) and the lower chuck (2) are also provided with the same chuck connecting holes, and the upper chuck (1) and the lower chuck (2) are fixedly connected with the upper supporting disc (3) and the lower supporting disc (4) respectively through fasteners.
5. The mechanical test fixture for the mixed stress mode of the U-shaped test sample is characterized in that a right-angle edge and an arc edge of the upper support plate (3) and the lower support plate (4) are intersected and extend outwards along an arc line where the arc edge is located, chuck connecting holes are also formed in the extending positions, and the installation range of the upper chuck (1) and the lower chuck (2) is expanded through opposite extending portions.
6. The mechanical test fixture for the U-shaped test sample in the mixed stress mode is characterized in that the upper chuck (1) and the lower chuck (2) are identical in structure and are fan-shaped; and a connecting part is arranged in the middle of the fan shape along the radial direction and is connected with the testing machine.
7. The mixed stress mode mechanical test fixture for the U-shaped test sample according to claim 6, wherein the test sample to be tested is a U-shaped test sample and is formed by welding, bonding or riveting two U-shaped pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123228820.0U CN217033349U (en) | 2021-12-21 | 2021-12-21 | A mix atress mode mechanical test anchor clamps for U type sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123228820.0U CN217033349U (en) | 2021-12-21 | 2021-12-21 | A mix atress mode mechanical test anchor clamps for U type sample |
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| CN217033349U true CN217033349U (en) | 2022-07-22 |
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| CN202123228820.0U Active CN217033349U (en) | 2021-12-21 | 2021-12-21 | A mix atress mode mechanical test anchor clamps for U type sample |
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- 2021-12-21 CN CN202123228820.0U patent/CN217033349U/en active Active
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