Fixture capable of carrying out multi-sample fatigue test and application thereof

Abstract

A multi-sample fatigue test fixture and application thereof relate to the technical field of test fixtures, the multi-sample fatigue test fixture comprises a pressure head mounting seat and a sample support which are arranged side by side from top to bottom, the sample support is provided with a plurality of sample supporting areas side by side, and the pressure head mounting seat is arranged in a vertical lifting manner. The pressure head mounting seat is provided with a pressure head which is arranged in a vertically independent sliding manner and corresponds to each sample supporting area, and the height of each pressure head is adjustable. The problems that in the prior art, a fatigue test clamp can only clamp one sample in each test, a large number of tests with different cycle times are needed for bending fatigue tests of materials, a plurality of parallel tests are needed for the tests with the same cycle times, and consumed time is long are solved; and the problems that various material test samples are difficult to be completely consistent in processing, and the sizes of the samples are different, so that the samples with different sizes cannot be subjected to fatigue tests at the same time are solved.

Description

Technical Field

[0001] The invention relates to the technical field of test fixtures, in particular to a fixture capable of carrying out fatigue tests on multiple samples and applications thereof. Background Art

[0002] Fatigue test technology is used in a variety of fields such as aerospace, automobiles, electronics, and insulators. For example, in the aerospace field, this technology is used to evaluate the fatigue performance of aircraft structures during flight; in the automotive industry, it is used to test the durability of automotive parts; in the insulator industry, it is used to study the fatigue life of insulator products. In the insulator industry, there are currently many methods, including electronic universal testing machines, high-frequency vibration fatigue testing machines, etc. The three-point bending test method is widely used to evaluate the fatigue test of materials, which can ensure that the mechanical energy can be tested normally, greatly improve the test efficiency, and save the test cost.

[0003] The prior art discloses a patent with a publication number of CN114414399A, which includes a supporting chuck, an upper pressure chuck, a supporting roller group, and a calibrator. A rectangular replica notch is provided on the supporting chuck, two supporting chuck limit slots parallel to the rectangular replica notch are provided on both sides of the rectangular replica notch, and a calibrator installation slot is also provided in the rectangular replica notch; an upper pressure chuck limit slot is provided on the side of the upper pressure chuck opposite to the supporting chuck; during the test, the supporting roller group fits with the two supporting chuck limit slots and the upper pressure chuck limit slot respectively; the calibrator is used to ensure that the test piece is completely horizontal and completely vertical to the supporting roller, and is not affected by the eccentric force, and the calibrator can be removed after calibration. The present invention solves the defect that the traditional three-point bending fatigue test fixture cannot perform in-situ replica tests, and can calibrate the position of the test piece to ensure centering and alignment, with simple operation, low material cost, and simple processing.

[0004] The existing devices gradually exposed the shortcomings of the existing technology as they were used, mainly in the following aspects:

[0005] First, under existing technical conditions, tests are usually conducted on relatively large products or processed samples, and the sample size consistency requirements are relatively high. However, it is difficult to achieve complete consistency in the processing of test samples of various materials. The sizes of each sample are more or less different, making it impossible to conduct fatigue tests on samples of different sizes at the same time.

[0006] Second, the structure of the multi-sample test device involved in the existing technology is relatively complex, making the test procedure more cumbersome.

[0007] Third, the traditional three-point bending fixture can only clamp one sample per test, and the bending fatigue test of the material requires a large number of tests with different cycle times. Each cycle test takes a long time, and the same cycle test requires multiple parallel tests, which is time-consuming.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0009] In view of the defects in the prior art, the present invention provides a fixture capable of conducting fatigue tests on multiple samples and its application, so as to solve the problem that the fatigue test fixture in the traditional technology can only clamp one sample for each test, and for the bending fatigue test of the material, a large number of tests with different cycle times are required, and multiple parallel tests must be carried out for the same cycle time, which is time-consuming; and it is difficult to achieve complete consistency in the processing of test samples of various materials, and there are differences between the sizes of each sample, making it impossible to perform fatigue tests on test samples of different sizes at the same time.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A fixture capable of conducting fatigue tests on multiple samples and its application include a pressure head mounting seat and a sample support seat arranged in parallel from top to bottom, wherein a plurality of sample supporting areas are arranged in parallel on the sample support seat, the pressure head mounting seat is arranged to be lifted vertically, and a pressure head independently slidably arranged vertically is respectively arranged on the pressure head mounting seat corresponding to each sample supporting area, and the height of each pressure head is adjustable.

[0012] As an optimized solution, the sample support includes two bases arranged in parallel, the distance between the two bases is adjustable, and the upper ends of the bases are connected to steel rods.

[0013] As an optimized solution, an inverted triangular groove is provided at the upper end of the base, and the steel rod is fixed in the inverted triangular groove.

[0014] As an optimized solution, two blocks are arranged side by side between the two bases corresponding to each sample supporting area, and the two blocks are fixed to the inner walls of the two bases respectively. A sample supporting groove is opened at the upper end of the block, and the top surface of the steel rod is higher than the bottom surface of the supporting groove.

[0015] As an optimized solution, each base is provided with a bottom fixing hole, a screw is inserted into the bottom fixing hole, and the bottom fixing hole is connected to the fixed end of the fatigue testing machine through the screw.

[0016] As an optimized solution, the base has two side threaded holes arranged in parallel from top to bottom corresponding to each of the stoppers, the stoppers are provided with side fixing holes matching the side threaded holes, and cross-slot screws are provided in the side threaded holes and the side fixing holes.

[0017] As an optimized solution, the pressure head mounting seat is provided with a square sliding hole corresponding to each pressure head, a pressure rod is provided in the square sliding hole for vertical sliding, and the pressure head is fixed on the lower end of the pressure rod.

[0018] As an optimized solution, a regular triangular groove is provided at the lower end of the pressure rod, and the pressure head is fixed in the regular triangular groove.

[0019] As an optimized solution, a pressure plate is provided in each of the square sliding holes to slide in the horizontal direction, and the pressure plate and the pressure rod are frictionally opposed to each other.

[0020] As an optimized solution, three upper threaded holes are arranged in parallel from top to bottom on the side wall of the pressure head mounting seat, a threaded through hole is opened at the center of the side wall of the pressure plate, and cylindrical hexagonal screws are arranged in the threaded through hole and the upper threaded hole.

[0021] As an optimized solution, circular through holes are respectively provided on the pressure rod and the base, and short pins for fixing the steel rod or the pressure head are embedded in the circular through holes.

[0022] As an optimized solution, a threaded hole is provided at the center of the top of the pressure head mounting seat, and the threaded hole is fixedly connected to the lifting end of the fatigue testing machine through a cylindrical head hexagon socket screw.

[0023] The invention also discloses the application of the fixture capable of carrying out fatigue tests on multiple samples, including the application of carrying out fatigue tests on rods.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention can carry out fatigue tests on multiple specimens simultaneously, and the number of specimens can be determined according to the specific requirements of the test;

[0026] When the present invention tests multiple samples, each sample is evenly loaded by controlling the loosening and tightening states of the cylindrical head hexagon socket screws;

[0027] The parts of the present invention are easy to disassemble and assemble, the sample is simple to place, and there is no need for complicated procedures in use;

[0028] The present invention has no special requirements on the sample size, and samples of different sizes can be tested at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the installation position of the present invention and the fatigue testing machine.

[0032] In the figure: 1-sample support; 2-stopper; 3-support groove; 4-sample; 5-pressor mounting seat; 6-threaded hole; 7-pressing rod; 8-pressing plate; 9-hexagonal screw in cylinder; 10-pressing head; 11-circular through hole; 12-equilateral triangular groove; 13-inverted triangular groove; 14-steel rod; 15-bottom fixing hole; 16-cross-slot screw; 17-fatigue testing machine. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0034] like Figure 1 and Figure 2 As shown, a multi-sample fatigue test fixture is provided, including a pressure head mounting seat 5 and a sample support 1 arranged in parallel from top to bottom, a plurality of sample support areas are arranged in parallel on the sample support 1, the pressure head mounting seat 5 is arranged to be lifted vertically, and a pressure head 10 independently slidably arranged vertically is provided on the pressure head mounting seat 5 corresponding to each sample support area, and the height of each pressure head 10 is adjustable.

[0035] The sample support 1 comprises two bases arranged in parallel, the distance between the two bases is adjustable, and the upper ends of the bases are connected with steel rods 14 .

[0036] An inverted triangular groove 13 is formed at the upper end of the base, and a steel rod 14 is fixed in the inverted triangular groove 13 .

[0037] Two stoppers 2 are arranged in parallel between the two bases corresponding to each sample supporting area. The two stoppers 2 are fixed to the inner walls of the two bases respectively. A sample supporting groove 3 is opened at the upper end of the stopper 2. The top surface of the steel rod 14 is higher than the bottom surface of the supporting groove 3.

[0038] Each base is provided with a bottom fixing hole 15, in which a screw is inserted and connected to the fixed end of the fatigue testing machine 17 via the screw. The distance between the two bases can be adjusted by loosening the screw and moving the base.

[0039] The base has two side threaded holes 6 arranged in parallel from top to bottom corresponding to each stopper 2, and the stopper 2 has side fixing holes matching the side threaded holes 6, and cross-slot screws 16 are arranged in the side threaded holes 6 and the side fixing holes.

[0040] The pressure head mounting seat 5 is provided with a square sliding hole corresponding to each pressure head 10 , and a pressure rod 7 is vertically slidably arranged in the square sliding hole, and the pressure head 10 is fixed on the lower end of the pressure rod 7 .

[0041] The lower end of the pressing rod 7 is provided with an equilateral triangular groove 12 , and the pressing head 10 is fixed in the equilateral triangular groove 12 .

[0042] A pressing plate 8 is provided in each square sliding hole for sliding along the horizontal direction, and the pressing plate 8 and the pressing rod 7 are frictionally opposed to each other.

[0043] Three upper threaded holes 6 are arranged in parallel from top to bottom on the side wall of the pressure head mounting seat 5 , a threaded through hole is opened at the center of the side wall of the pressure plate 8 , and cylindrical hexagonal screws 9 are arranged in the threaded through hole and the upper threaded hole 6 .

[0044] The length of the hexagonal screw 9 in the cylinder must be greater than the sum of the length of the upper threaded hole 6 and the threaded through hole.

[0045] A circular through hole 11 is respectively formed on the pressure rod 7 and the base, and a short pin for fixing the steel rod 14 or the pressure head 10 is embedded in the circular through hole 11 .

[0046] A threaded hole 6 is provided at the center of the top of the pressure head mounting seat 5, and the threaded hole 6 is fixedly connected to the lifting end of the fatigue testing machine 17 through a cylindrical head hexagon socket screw.

[0047] The invention also discloses the application of the fixture capable of carrying out fatigue tests on multiple samples, including the application of carrying out fatigue tests on rods.

[0048] The working process of this device is:

[0049] Prepare the same number of samples 4 as the indenters 10, and perform parallelism and other treatments on the samples 4 according to the test reference standard requirements. The sizes of the samples 4 may be different;

[0050] The fatigue testing machine 17 is connected and fixed to the pressure head mounting seat 5 through the threaded hole 6. By operating the fatigue testing machine 17, the pressure head mounting seat 5 is raised as a whole along with the fatigue testing machine 17 and away from the sample support 1.

[0051] The processed samples are sequentially placed into the support groove 3 of the sample holder 1 in this embodiment, and the bottom is naturally in contact with the steel rod 14;

[0052] Operate the fatigue testing machine 17 to slowly lower the indenter mounting seat 5 until the indenter 10 is about 2-3 mm away from the highest point of the sample 4 (all samples 4 are not in contact with the indenter 10);

[0053] Loosen the hexagonal screws 9 in the cylinder in sequence to separate the pressure plate 8 from the pressure rod 7. The pressure rod 7 performs free fall motion. The pressure head 10 at the bottom automatically stops after contacting the upper surface of the sample 4. At this time, tighten the corresponding hexagonal screws 9 in the cylinder to connect and fix the pressure rod 7 to the pressure plate 8.

[0054] All the indenters 10 are in natural contact with the upper surface of the sample 4 at the same time without external force. At this time, all the samples 4 can be evenly loaded during the test. The fatigue testing machine 17 is controlled to make the indenter mounting seat 5 rise again to 2-3 mm above the sample 4, and then the test can be started.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. The fixture can be used for multi-sample fatigue testing, characterized by: The invention comprises a pressure head mounting seat (5) and a sample support seat (1) arranged in parallel from top to bottom, wherein a plurality of sample support areas are arranged in parallel on the sample support seat (1), the pressure head mounting seat (5) is arranged to be lifted vertically, and a pressure head (10) is arranged to slide independently vertically on the pressure head mounting seat (5) corresponding to each sample support area, and the height of each pressure head (10) is adjustable.

2. The fixture capable of performing fatigue tests on multiple samples according to claim 1 is characterized in that: The sample support (1) comprises two bases arranged in parallel, the distance between the two bases is adjustable, and the upper ends of the bases are connected to steel rods (14).

3. The fixture capable of performing fatigue tests on multiple samples according to claim 2 is characterized in that: An inverted triangular groove (13) is provided at the upper end of the base, and the steel rod (14) is fixed in the inverted triangular groove (13).

4. The fixture capable of performing fatigue tests on multiple samples according to claim 2 is characterized in that: Two stoppers (2) are arranged in parallel between the two bases corresponding to each sample support area. The two stoppers (2) are fixedly connected to the inner walls of the two bases respectively. The upper ends of the stoppers (2) are provided with sample support grooves (3). The top surface of the steel rod (14) is higher than the bottom surface of the support groove (3).

5. The fixture capable of performing fatigue tests on multiple samples according to claim 2 is characterized in that: Each of the bases is provided with a bottom fixing hole (15), a screw is inserted into the bottom fixing hole (15), and the bottom fixing hole (15) is connected to a fixing end of a fatigue testing machine (17) via the screw; A threaded hole (6) is provided at the center of the top of the pressure head mounting seat (5), and the threaded hole (6) is fixedly connected to the lifting end of the fatigue testing machine (17) through a cylindrical head hexagon socket screw.

6. The fixture capable of performing fatigue tests on multiple samples according to claim 4 is characterized in that: The base is provided with two side threaded holes (6) arranged in parallel from top to bottom corresponding to each of the stoppers (2); the stoppers (2) are provided with side fixing holes matching the side threaded holes (6); and cross-slot screws (16) are provided in the side threaded holes (6) and the side fixing holes.

7. The fixture capable of performing fatigue tests on multiple samples according to claim 1 is characterized in that: The pressure head mounting seat (5) is provided with a square sliding hole corresponding to each pressure head (10), a pressure rod (7) is provided in the square sliding hole for vertical sliding, and the pressure head (10) is fixed on the lower end of the pressure rod (7).

8. The fixture capable of performing fatigue tests on multiple samples according to claim 7 is characterized in that: The lower end of the pressure rod (7) is provided with an equilateral triangular groove (12), and the pressure head (10) is fixed in the equilateral triangular groove (12).

9. The fixture capable of performing fatigue tests on multiple samples according to claim 7, characterized in that: A pressing plate (8) is provided in each of the square sliding holes so as to slide in the horizontal direction, and the pressing plate (8) and the pressing rod (7) are in friction with each other.

10. Application of the fixture capable of performing fatigue tests on multiple samples according to any one of claims 1 to 9, characterized in that: Includes application to fatigue testing of bars.

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