CN111122328A - Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample - Google Patents
Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample Download PDFInfo
- Publication number
- CN111122328A CN111122328A CN202010053712.5A CN202010053712A CN111122328A CN 111122328 A CN111122328 A CN 111122328A CN 202010053712 A CN202010053712 A CN 202010053712A CN 111122328 A CN111122328 A CN 111122328A
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- clamping
- aging
- round bar
- hole
- stress relaxation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
Abstract
The invention discloses a universal fixture for a compressive creep aging and stress relaxation aging experiment of a round bar-shaped sample, which comprises a fixture main body, a conductive device and a plurality of locking devices, wherein the fixture main body comprises two clamping parts, each clamping part is provided with an inner groove, and the inner grooves of the two clamping parts surround to form a clamping through hole for accommodating the round bar-shaped sample; the conducting device comprises two conducting blocks which are respectively connected with the two clamping parts; when the device is used, the clamp is clamped in the middle part of the sample to protect the sample; the invention can accurately test the compressive creep aging/stress relaxation aging experiment with the initial loading stress higher than the yield strength of the material; meanwhile, a compression experiment can be carried out at high temperature, the reliability of creep aging/stress relaxation aging experiment data is ensured, and the sample is not bent after aging. The universal fixture disclosed by the invention is simple in structure, convenient to use and wide in application range.
Description
Technical Field
The invention relates to the technical field of auxiliary experimental appliances, in particular to a universal fixture for compressive creep aging and stress relaxation aging experiments of a round bar-shaped test sample.
Background
With the increasing demand of advanced aviation aircrafts for structures with high strength, light weight, long service life, high temperature resistance and the like. The commonly used forming modes of the complex components mainly comprise: press bending forming, shot blasting forming, creep aging forming, laser sheet metal forming, spinning, stamping and the like. The aging stress relaxation is an ideal method for forming the aging aluminum alloy large-scale wing integral wallboard, the residual stress of the wallboard after forming is small, a few clamps are needed in the forming process, the forming process repeatability is good, and the fatigue resistance is obviously improved. The aging stress relaxation forming is a process method for realizing the forming of parts by partially converting elastic pre-strain of parts to be formed into plastic strain at a certain temperature and for a certain time by utilizing the stress relaxation characteristic of materials caused by creep deformation. The actual forming process is called aging stress relaxation forming because it is closer to the stress relaxation process in which the elastic pre-strain of the part is converted into plastic strain. The part obtained by the aging stress relaxation forming has the advantages of small residual stress, no need of excessive clamps in the forming process, good process repeatability, capability of improving the fatigue resistance of the aging aluminum alloy and the like, so the aging stress relaxation forming becomes an important direction for researching and solving the forming and manufacturing problems of large-size large-scale components which are large in size, inconvenient to use conventional forming dies and complicated in internal structure in the field of aeronautical manufacturing.
Creep is the phenomenon in which the strain of a solid material increases with time while maintaining a constant stress. Stress relaxation is the phenomenon in which stress decreases with time in a material maintaining constant deformation, and this phenomenon is stress relaxation, which is understood to be a creep in a broad sense. At present, many researches on stress relaxation aging test clamps for uniaxial tension are carried out, but the compression stress relaxation test clamps for aluminum alloy rod-shaped samples are limited to initial loading stress in an elastic stage at present, and when the stress exceeds the initial stress in the elastic stage, the material is subjected to buckling bending. The compression stress relaxation is different from the stretching, the cylindrical aluminum alloy rod-shaped sample is subjected to a compression stress relaxation aging experiment for more than 16h on a creep machine (at high temperature), the material is softened at the initial aging stage due to high temperature, when the loaded force exceeds the yield strength of the cylindrical aluminum alloy rod-shaped sample, the cylindrical aluminum alloy rod-shaped sample can generate bending instability to cause distortion of stress relaxation experiment data, and the correct relaxation curve of the high-temperature stress relaxation aging experiment at the temperature higher than the yield strength cannot be tested. In view of the above problems, the present inventors have studied a device for testing the compression performance of a plate, for example, patent CN201611135746.9 discloses a general purpose anti-instability clamp for testing the compression performance of an edge/center notched composite laminated plate, which comprises a dog bone type metal splint having an edge opening and a center opening, a PA6 nylon sandwich layer, a wing nut and bolt, and an opening reinforcement accessory. The connection relationship is as follows: the PA6 nylon interlayer is arranged on the upper surface and the lower surface of the laminated plate, the dog-bone-shaped clamping plates are arranged on the surfaces of the upper nylon interlayer and the lower nylon interlayer, 8 pairs of butterfly nuts and bolts are used for fastening the dog-bone-shaped clamping plates to clamp the nylon interlayer and the laminated plate, and the semi-cylindrical bosses of the opening reinforcing accessory are inserted into the openings of the clamping plates and are fixed on the metal clamping plates through the butterfly bolts and the threaded holes. The instability-preventing universal fixture edge/center notch composite material laminated plate is used for testing the compression performance and is not suitable for a bending stress relaxation aging experiment of a cylindrical aluminum alloy rod-shaped sample.
Disclosure of Invention
The invention aims to provide a universal fixture for a compressive creep aging experiment and a stress relaxation aging experiment of a round bar-shaped test sample, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides a universal fixture for a compressive creep aging and stress relaxation aging experiment of a round bar-shaped sample, which comprises a fixture main body, a conductive device and a plurality of locking devices, wherein the fixture main body comprises two clamping parts, each clamping part is provided with an inner groove, the two clamping parts are fixedly connected through the locking devices, the inner grooves of the two clamping parts surround to form a clamping through hole for accommodating the round bar-shaped sample, one end of each clamping part is provided with an installation groove, and the concave direction of the installation groove is different from the concave direction of the inner groove; the conducting device comprises two conducting blocks, and the two conducting blocks are respectively arranged in the two mounting grooves; the clamping through hole is used for inserting the round bar-shaped test sample when the round bar-shaped test sample is subjected to a compressive creep aging and/or stress relaxation aging test, and the middle part of the round bar-shaped test sample in the length direction is used for being clamped by the clamping component in the circumferential direction; the two conductive blocks are respectively positioned on two radial sides of the round bar-shaped sample.
Preferably, one or a plurality of notches are arranged in the inner groove of each clamping component at intervals along the circumferential direction of the clamping through hole, the length direction of each notch is arranged along the axial direction of the clamping through hole, and the length of each notch is consistent with the axial length of the clamping through hole.
Preferably, the universal fixture further comprises an adjusting gasket arranged in the inner groove and used for matching round bar-shaped samples with different diameters, and a protruding block matched with the notch is arranged on one side, which is used for being in contact with the inner groove, of the adjusting gasket.
Preferably, two ends of each clamping component are respectively provided with a first through hole, and the first through hole positioned at the end of the clamping component provided with the mounting groove penetrates through the mounting groove; the conductive blocks are provided with second through holes matched with the first through holes penetrating through the mounting grooves, and the two conductive blocks are arranged in the corresponding mounting grooves through the locking devices.
Preferably, the locking device comprises a locking bolt and a locking nut, the locking bolt penetrates through the first through hole and the second through hole to fixedly connect the two clamping parts, and the two conductive blocks are respectively connected with the two clamping parts.
Preferably, spring washers are arranged between the head of the locking bolt and the clamping component and between the locking nut and the clamping component.
Preferably, the diameter of the radial section of the groove is smaller than or equal to the diameter of the round rod-shaped test piece.
Preferably, the diameter of the cross section of the clamping through hole in the axial direction is 0-2 mm smaller than the diameter of the round rod-shaped sample.
Preferably, the attaching surfaces of the two clamping parts which are attached to form the clamp main body are planes, the concave direction of the inner groove is along the direction that the attaching surface is concave towards the direction far away from the attaching surface, and the concave direction of the mounting groove on the clamping part is perpendicular to the concave direction of the inner groove.
Compared with the prior art, the invention has the following beneficial effects:
(1) the universal fixture for the compressive creep aging and stress relaxation aging experiments of the round bar-shaped test sample comprises a fixture main body, a conductive device and a plurality of locking devices, wherein the fixture main body comprises two clamping parts, and the conductive device comprises two conductive blocks; the clamp is used for protecting the round bar-shaped test sample when the round bar-shaped test sample is subjected to a compression creep aging and/or stress relaxation aging experiment. The clamp can accurately test the compressive creep aging/stress relaxation aging test with the initial loading stress higher than the yield strength of the material; meanwhile, a compression experiment can be carried out at high temperature, the reliability of creep aging/stress relaxation aging experiment data is ensured, and the sample is not bent after aging. The universal fixture is simple in structure and convenient to use.
(2) The stress is uniformly distributed by arranging the notches in the inner grooves of the clamping parts; and the adjusting gaskets are nested in the grooves, so that the clamp can adapt to various cylindrical rod-shaped samples with different diameters, the mold processing amount is effectively saved, and the cost is reduced.
(3) The electric pulse experiment can be carried out while the creep aging and stress relaxation experiments are carried out by using the clamp by additionally arranging the conductive device in the clamp, so that the multifunctional application of a single clamp is realized. At present, the research on the creep stress relaxation aging process of the electric pulse is only limited to the research on tensile plate-shaped samples, and the research on compressive round rod-shaped samples is not yet carried out. Therefore, the universal clamp has the power-on function, and the application range can be well widened.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a preferred embodiment universal fixture according to the present invention;
FIG. 2 is a schematic view of the structure of the holding member of the present invention;
FIG. 3 is a schematic view of the structure of the conductive block of the present invention;
FIG. 4 is a schematic view of the adjusting shim according to the present invention;
FIG. 5 is a schematic structural view showing a state in which the universal fixture of the present invention is used in cooperation with a test specimen;
the test fixture comprises a clamping component 1, a clamping component 1.1, an inner groove 1.2, a mounting groove 1.3, a notch 1.4, a first through hole 1a, a clamping through hole 2, a conductive block 2.1, a second through hole 3, an adjusting gasket 3.1, a bump 4, a locking bolt 5, a locking nut 6, a spring washer 7 and a round bar-shaped test sample.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 1 to 5, the universal fixture for the compressive creep aging and stress relaxation aging experiments of the round bar-shaped test sample comprises a fixture main body, a conductive device and a plurality of locking devices, wherein the fixture main body comprises two clamping parts 1, each clamping part is provided with an inner groove 1.1, the two clamping parts are fixedly connected through the locking devices, the inner grooves 1.1 of the two clamping parts surround to form a clamping through hole 1a for accommodating the round bar-shaped test sample 7, one end of each clamping part is provided with a mounting groove 1.2, and the recess direction of the mounting groove is different from the recess direction of the inner groove 1.1; the clamping through hole 1a is used for inserting the round bar-shaped test piece when the round bar-shaped test piece 7 is subjected to a compressive creep aging test and/or a stress relaxation aging test, and the middle part of the round bar-shaped test piece 7 in the length direction is used for being clamped by a clamping component in the circumferential direction. In the experimental process, the universal fixture is clamped and arranged in the middle of the round bar-shaped test sample to protect the round bar-shaped test sample, so that the test sample is prevented from being bent and unstable to cause distortion of stress relaxation experimental data, and the compressive creep aging/stress relaxation aging of which the initial loading stress is higher than the yield strength of the material is accurately tested. If the clamp of the embodiment is not used, the round bar-shaped test sample is bent in about one minute; after the use of the jig of this example, the round bar-shaped sample was not bent even after the experiment at a high temperature for several tens of hours.
In a specific embodiment, the inner groove 1.1 of each clamping part is provided with one or a plurality of notches 1.3 arranged at intervals along the circumferential direction of the clamping through hole 1a, the length direction of each notch is arranged along the axial direction of the clamping through hole 1a, and the length of each notch is consistent with the axial length of the clamping through hole 1 a. Preferably, an adjusting shim 3 for matching round bar-shaped test samples 7 with different diameters is arranged in the inner groove 1.1, and a lug 3.1 matched with the notch 1.3 is arranged on one side of the adjusting shim, which is in contact with the inner groove. The structural arrangement provides for even stress distribution by providing one or more notches in the inner recess of the clamping member. Preferably, the diameter of the cross section of the clamping through hole 1a in the axial direction is 0 to 2mm smaller than the diameter of the round bar-shaped test piece 7. Nested installation adjustment gasket in the notch lets this anchor clamps can adapt to the pole form sample of different diameters, and the diameter of pole form sample for example is 8 ~ 10mm, and when the diameter of inner groovy was 8mm, can be through setting up adjustment gasket in the inner groovy, makes this anchor clamps be applicable to this sample, also can be that this anchor clamps can be applicable to the sample of multiple different diameters. If the diameter of the round bar specimen is too large to be used in a jig, the jig cannot be used in common. In this embodiment, if the diameter of the round bar-shaped test sample is 10mm and the diameter of the inner groove is 8mm, the clamp is not an even hoop for the round bar-shaped test sample in the circumferential direction, but it is also feasible that the two clamping members have four-point press hoops for the test sample in the circumferential direction.
In a specific embodiment, the conductive device comprises two conductive blocks 2, which are respectively arranged in the two mounting grooves; preferably, two conductive bumps 2 are located on both sides of the specimen in the radial direction. Specifically, two ends of each clamping component are respectively provided with a first through hole 1.4, and the first through hole 1.4 positioned at one end of each clamping component provided with the mounting groove 1.2 penetrates through the mounting groove; the conductive blocks are provided with second through holes 2.1 matched with the first through holes penetrating through the mounting grooves, and the two conductive blocks are arranged in the corresponding mounting grooves through locking devices. The universal fixture of this embodiment can carry out the electric pulse experiment for the experiment in creep ageing and stress relaxation experiment through setting up electric installation, realizes the multi-functional application of single anchor clamps.
In a specific embodiment, the locking device comprises a locking bolt 4 and a locking nut 5, the locking bolt penetrates through the first through hole and the second through hole to fixedly connect the two clamping parts, and the two conductive blocks 2 are respectively connected with the two clamping parts 1. Spring washers 6 are provided between the head of the lock bolt 4 and the clamping member and between the lock nut 5 and the clamping member.
In a specific embodiment, the attaching surfaces of the two clamping parts 1 which are attached to form the clamp body are both flat surfaces, the concave direction of the inner groove 1.1 is concave along the attaching surface in the direction away from the attaching surface, and the concave direction of the installation groove 1.2 on the clamping part 1 is perpendicular to the concave direction of the inner groove 1.1.
The universal fixture of the embodiment is mainly used for creep aging and stress relaxation aging experiments of round rod-shaped samples, but is not limited to the preparation of materials of compressed rod-shaped samples. The compression test under high temperature and high stress can be carried out as long as the strength of the clamp material is more than 2 times of the yield strength of the sample.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The universal fixture for the compressive creep aging and stress relaxation aging experiments of the round bar-shaped test sample is characterized by comprising a fixture main body, a conductive device and a plurality of locking devices, wherein the fixture main body comprises two clamping parts (1), each clamping part is provided with an inner groove (1.1), the two clamping parts are fixedly connected through the locking devices, the inner grooves (1.1) of the two clamping parts surround to form a clamping through hole (1a) for accommodating the round bar-shaped test sample (7), one end of each clamping part is provided with an installation groove (1.2), and the recess direction of the installation groove is different from the recess direction of the inner groove; the conducting device comprises two conducting blocks (2), and the two conducting blocks are respectively arranged in the two mounting grooves; the clamping through hole (1a) is used for inserting a round bar-shaped test sample (7) when the round bar-shaped test sample is subjected to a compression creep aging and/or stress relaxation aging test, and the middle part of the round bar-shaped test sample (7) in the length direction is used for being clamped by the clamping component in the circumferential direction; the two conductive blocks (2) are respectively positioned at two radial sides of the round bar-shaped sample.
2. The universal fixture according to claim 1, wherein each of the inner grooves (1.1) of the clamping members is provided therein with one or a plurality of notches (1.3) arranged at intervals in the circumferential direction of the clamping through-hole (1a), the length direction of each of the notches is arranged in the axial direction of the clamping through-hole (1a), and the length of the notch coincides with the axial length of the clamping through-hole (1 a).
3. Universal fixture according to claim 2, characterized in that it further comprises an adjusting shim (3) arranged in the inner recess (1.1) for matching round bar specimens (7) of different diameters, the side of the adjusting shim intended to come into contact with the inner recess being provided with a projection (3.1) adapted to the notch (1.3).
4. The universal fixture according to claim 1, wherein each of the clamping members is provided with a first through hole (1.4) at each of two ends thereof, and the first through hole (1.4) at the end of the clamping member provided with the mounting groove (1.2) is provided to penetrate through the mounting groove; and the conductive blocks are provided with second through holes (2.1) matched with the first through holes penetrating through the mounting grooves, and the two conductive blocks are arranged in the corresponding mounting grooves (1.2) through the locking devices.
5. Universal clamp according to claim 4, characterized in that the locking means comprise a locking bolt (4) and a locking nut (5), the locking bolt extending through the first and second through holes to fixedly connect the two clamping members and to connect the two conductive blocks (2) with the two clamping members (1), respectively.
6. Universal clamp according to claim 5, characterized in that spring washers (6) are provided between the head of the locking bolt (4) and the clamping part and between the locking nut (5) and the clamping part.
7. Universal clamp according to any of the claims 1-6, characterized in that the diameter of the radial cross section of the groove is smaller than or equal to the diameter of the round bar specimen (7).
8. The universal fixture according to claim 7, wherein the diameter of the cross section in the axial direction of the clamping through-hole (1a) is 0 to 2mm smaller than the diameter of the round bar-shaped test piece (7).
9. Universal clamp according to any of claims 1-6, characterized in that the abutment surfaces of both clamping parts (1) abutting to form the clamp body are plane and the recess direction of the inner recess (1.1) is recessed in the direction of the abutment surface away from the abutment surface, whereas the recess direction of the mounting recess (1.2) on the clamping part (1) is perpendicular to the recess direction of the inner recess (1.1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053712.5A CN111122328A (en) | 2020-01-17 | 2020-01-17 | Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053712.5A CN111122328A (en) | 2020-01-17 | 2020-01-17 | Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample |
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| Publication Number | Publication Date |
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| CN111122328A true CN111122328A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010053712.5A Pending CN111122328A (en) | 2020-01-17 | 2020-01-17 | Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample |
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| CN (1) | CN111122328A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697619A (en) * | 2020-12-15 | 2021-04-23 | 上海交通大学 | Metal circulating loading device under ultrasonic vibration condition |
| CN112763313A (en) * | 2020-12-02 | 2021-05-07 | 中国科学院金属研究所 | Comparison method for stress relaxation resistance of metal material |
| CN114002064A (en) * | 2021-11-02 | 2022-02-01 | 重庆邮电大学 | Multi-medium-based biaxial stretching instrument capable of adopting and disassembling clamp |
-
2020
- 2020-01-17 CN CN202010053712.5A patent/CN111122328A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763313A (en) * | 2020-12-02 | 2021-05-07 | 中国科学院金属研究所 | Comparison method for stress relaxation resistance of metal material |
| CN112697619A (en) * | 2020-12-15 | 2021-04-23 | 上海交通大学 | Metal circulating loading device under ultrasonic vibration condition |
| CN114002064A (en) * | 2021-11-02 | 2022-02-01 | 重庆邮电大学 | Multi-medium-based biaxial stretching instrument capable of adopting and disassembling clamp |
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