Auxiliary device for realizing speed-adjustable slow impact on universal testing machine

Abstract

The utility model relates to the field of test equipment, in particular to an auxiliary device for realizing speed-adjustable slow impact on a universal testing machine, which comprises an impact component and a sample support below the impact component, the upper end of the impact component is fixedly connected with an upper clamp of the universal testing machine, and the lower end of the impact component is fixedly connected with a lower clamp of the universal testing machine. The test sample support is fixedly arranged on a lower clamp of the universal testing machine, a test sample is placed on the test sample support, the auxiliary device is used for assisting the universal testing machine to realize a low-speed impact test with adjustable impact rate, an obtained impact curve is smooth and free of shaking, and the test sample can be placed on the test sample support. And accurate quantification is provided for research on the impact performance and the fracture mechanism of the material.

Description

TECHNICAL FIELD

[0001] The utility model relates to a test equipment field, concretely relates to a kind of adjustable rate slow impact auxiliary device on universal testing machine is realized. BACKGROUND

[0002] The impact performance of metal material is generally measured by impact testing machine. The impact testing machine is roughly divided into pendulum type and drop hammer type, wherein the pendulum type testing machine is more widely used in the field of metal material application, and the structure of the pendulum type testing machine is shown in Figure 1 , wherein A1 is a dial, A2 is a pendulum, A3 is a support, and A4 is a sample. The process of the pendulum hitting the sample is shown in Figure 2 . The drop hammer type impact testing machine is generally used for drop hammer impact test of ferrite steel (especially various pipeline steels). The impact sample rate of the pendulum type impact testing machine is constant (about 5.2 m / s) during measurement, and the process is completed instantaneously. After the completion of the ordinary pendulum type impact testing machine, the impact absorbed energy measurement value can be obtained. This index reflects the maximum impact force that the metal material can withstand when subjected to external impact. With the deepening of material application research, people need to understand the impact fracture mechanism of the material, which leads to the oscilloscope impact testing machine, which can record the dynamic tearing process of the material during impact test. The oscilloscope impact testing machine is equipped with a dynamic load measurement system on the ordinary pendulum type impact testing machine, and the entire test process is consistent with the ordinary impact process.

[0003] Due to the particularly fast impact breaking rate of the material in the impact test, the precision of the dynamic load measurement system is very high. The impact curve obtained by using the oscilloscope impact testing machine (as shown in Figure 3 ) has obvious fluctuations, and the curve is smoothed for analysis. In addition, the instantaneous rate of the pendulum hitting test depends on the length of the pendulum arm and the initial height of the drop, and the length of the pendulum arm and the initial height of the drop are fixed in the general impact testing machine. Therefore, it is impossible to slow down the impact rate to allow the dynamic load measurement system to collect more accurate curves by adjusting the impact rate. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the shortcomings of the prior art, and provides an auxiliary device for realizing adjustable rate slow impact on a universal testing machine. The auxiliary device is installed on the universal testing machine, the impact rate can be adjusted for slow impact test, and the entire impact process can be accurately recorded. The impact curve does not have large fluctuations, and the problem that the oscilloscope impact testing machine cannot freely adjust the rate to study the impact performance of the material under different impact rates is solved.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a kind of adjustable rate slow impact auxiliary device is realized on universal testing machine, including impact subassembly and its below sample support, the upper end of the impact subassembly is fixedly connected with the upper clamp of universal testing machine, and the sample support is fixedly arranged on the lower clamp of universal testing machine.

[0007] Specifically, the impact subassembly includes an adapter, the upper end of the adapter is fixedly connected with the upper clamp of the universal testing machine, and the lower end is fixedly connected with the impact bit.

[0008] Specifically, the adapter is fixedly connected with the impact bit through a protruding portion.

[0009] Specifically, the sample support includes a lower support, the lower end of the lower support is fixedly connected with the lower clamp of the universal testing machine, and the upper end is fixedly provided with an upper support.

[0010] Specifically, the upper end of the lower support is provided with two upper supports at intervals, and the two upper supports are symmetrically arranged.

[0011] Specifically, the upper end of the lower support is provided with a sliding rail, and the lower end of the upper support is fixedly provided with a sliding block matched with the sliding rail.

[0012] Specifically, the side edge of the lower support is provided with a scale for measuring the span between the two upper supports.

[0013] Specifically, the upper end of the upper support is provided with an impact anvil.

[0014] Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

[0015] The auxiliary device is installed on the universal testing machine commonly used in the metal material laboratory, and the slow impact test with adjustable impact rate is realized by using the auxiliary device to assist the universal testing machine, so as to obtain the crack initiation work and crack propagation work of different metal materials under different impact rates. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings incorporated into the specification and forming part of the specification, together with the specification, serve to explain the principles of the utility model.

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 Fig. 1 is a structural schematic diagram of a pendulum type testing machine;

[0019] Figure 2 Fig. 2 is a structural schematic diagram of the pendulum type testing machine impacting a sample;

[0020] Figure 3 Fig. 3 is an impact curve obtained by a oscillographic impact testing machine;

[0021] Figure 4 Fig. 4 is a structural schematic diagram of an auxiliary device;

[0022] Figure 5 Fig. 5 is a structural schematic diagram of an upper support of the auxiliary device;

[0023] Figure 6 Fig. 6 is an impact curve obtained by the auxiliary device.

[0024] Fig. 1 is a structural schematic diagram of a pendulum type testing machine; DETAILED DESCRIPTION

[0025] The exemplary embodiments will be described in detail herein below with reference to the drawings. When the following description refers to the drawings, identical numbers on different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0026] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in further detail below with reference to the drawings and examples.

[0027] EXAMPLE

[0028] Referring to Figure 4The embodiment provides an auxiliary device for realizing adjustable-rate slow impact on a universal testing machine, which comprises an impact assembly 2 and a sample support 3 below the impact assembly 2, the upper end of the impact assembly 2 is fixedly connected with an upper clamp 1 of the universal testing machine, and the sample support 3 is fixedly arranged on a lower clamp 4 of the universal testing machine. The universal testing machine is usually mainly used for measuring the tensile, bending, compressive and shearing properties of a material, realizes pulling and pressing force, and the displacement rate of the crossbeam can be adjusted. For example, the Instron 5982 can be freely set within 0-800 mm / min. In addition, the load collection accuracy of the universal testing machine can reach 0.5 level, and the accuracy is high. Therefore, the auxiliary device in the embodiment can realize the slow impact test of the material at different impact rates when the auxiliary device is installed on the universal testing machine, and the whole test load change process can be recorded.

[0029] When the impact test is performed, the sample is placed on the sample support 3, and the position of the sample is adjusted so that the U-shaped notch of the sample is located directly below the impact assembly 2. The sample is a K U2 impact sample in accordance with the requirements of GB / T229 standard. In this process, the crossbeam of the universal testing machine can be lowered, and the impact assembly 2 is stopped when approaching the upper surface of the sample. The position of the sample is finely adjusted so that the impact assembly 2 is centered with the U-shaped notch of the sample. After the displacement rate (within 0-800 mm / min) of the crossbeam is set according to the test requirements, the universal testing machine is started, and the impact test is started. For the material that cannot be broken, the crossbeam distance limit is set, and the set value is preferably ≤10 mm, so as to protect the testing machine from being damaged. In the test process, the displacement-force value curve is continuously collected, and the test is stopped when the sample is broken or the crossbeam moving distance limit set value is reached. The impact absorbed energy, crack initiation work and crack propagation work results at the corresponding rate are obtained by analyzing the obtained curve.

[0030] Specifically, the impact assembly 2 comprises an adapter 201, the upper end of the adapter 201 is fixedly connected with the upper clamp 1 of the universal testing machine, the lower end of the adapter 201 is fixedly connected with an impact cutter head 203 through a protruding part 202, the impact cutter head 203 meets the GB / T229 K U2 standard cutter head, the blade radius is 2 mm, the protruding part 202 and the lower end of the adapter 201 can be integrally formed, or can be fixedly connected through bolts and the like, the lower end of the protruding part 202 is provided with an internal screw hole, the upper end of the impact cutter head 203 is provided with an external screw thread matched with the internal screw hole, and the impact cutter head 203 is threadedly connected with the internal screw hole of the protruding part 202 through the external screw thread. The lower end of the protruding part 202 and the impact cutter head 203 can also be clamped. A clamping groove is arranged at the lower end of the protruding part 202 according to the size of the impact cutter head 203. The size of the protruding part 202 is smaller, the impact cutter head 203 is convenient to assemble and disassemble, and the line of sight is not blocked, so that the test personnel can observe the test process.

[0031] In this embodiment, the adapter 201 is designed to use high-strength materials, such as high-strength stainless steel, and the upper end of the adapter 201 can be designed into a flat surface with a recessed internal threaded hole, or a cylindrical convex threaded column, or other connection methods according to different upper clamp fixing methods of the universal testing machine. When the impact assembly 2 is installed, the axis of the impact cutter head 203 is perpendicular to the upper surface of the sample.

[0032] Specifically, the sample support 3 comprises a lower support 304, the lower end of the lower support 304 is fixedly connected with the lower clamp 4 of the universal testing machine through a connecting member such as a screw, and the upper end of the lower support 304 is spaced apart from two upper supports 302, and the lower end of the upper support 302 is in contact with the upper end of the lower support 304, which can ensure the stability of the upper support during impact. During the test, the two ends of the sample A4 are located at the upper ends of the two upper supports 302, respectively, and the displacement of the sample A4 can be measured by the displacement sensor 5. Figure 5 The upper end of the lower support 304 is provided with a sliding rail, and the lower end of the upper support 302 is fixedly provided with a sliding block 303 matched with the sliding rail, and the sliding block 303 is embedded in the sliding rail. Therefore, the span between the two upper supports 302 can be conveniently adjusted according to the requirements before the test, and after the span is adjusted, the upper support 302 is fixedly connected with the lower support 304 through a connecting member such as a fastening bolt.

[0033] In order to intuitively measure the span between the two upper supports 302, a scale can be provided on the side of the lower support 304, and the scale is along the length direction of the sliding rail. In order to better observe the scale, the scale can be arranged on a slightly inclined boss which can be integrally formed with the lower support 304.

[0034] Specifically, the upper end of the upper support 302 is further provided with an impact anvil 301, and the upper end of the upper support 302 is provided with a recess 305 and a fixed screw hole according to the size of the impact anvil 301. The impact anvil 301 is fixedly embedded in the recess 305, and when the sample is placed, the sample is located on the impact anvil 301, which can better protect the upper support 302.

[0035] In order to better illustrate the beneficial effects of the utility model, after the auxiliary device of the utility model is installed on the universal testing machine, the titanium alloy sample is subjected to impact fracture tests at different impact fracture rates according to GB / T 229, and the displacement-force value curve obtained is shown in FIG. 2. Figure 6 From Figure 6 It can be seen that the fluctuation of the slow impact test curve is much smaller than that of the oscillographic impact curve, and the sample after impact fracture will not fly out due to the instantaneous energy of the pendulum, and the precision of the absorbed energy obtained is also higher than that of the oscillographic impact. After analyzing the displacement-force value curve, the results of the impact absorbed energy, crack initiation work and crack propagation work are shown in Table 1:

[0036] Table 1 Data obtained from titanium alloy samples at different impact fracture rates

[0037]

[0038] As can be seen from Table 1, under different impact rates, the three energy value indexes of the sample measured overall show an upward trend, when the impact rate is 800mm / min, the crack initiation energy and the crack propagation energy appear the trend of being replaced by each other, compared with the impact test, the adjustable speed impact test process by using the utility model is stable, the repeatability is good, the crack initiation and propagation process is slowed down, and the utility model can be used for measuring the sample under different conditions and researching the fracture behavior of the sample under different microstructures.

[0039] The above description is merely a specific implementation of the utility model, which enables those skilled in the art to understand or implement the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model.

[0040] It should be understood that the utility model is not limited to the above described and can be variously modified and changed without departing from its scope. The scope of the utility model is limited only by the appended claims.

Claims

1. An auxiliary device for achieving adjustable-rate slow impact on a universal testing machine, characterized in that, It includes an impact assembly (2) and a sample support (3) below it. The upper end of the impact assembly (2) is fixedly connected to the upper clamp (1) of the universal testing machine, and the sample support (3) is fixedly set on the lower clamp (4) of the universal testing machine.

2. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 1, characterized in that, The impact assembly (2) includes an adapter (201), the upper end of which is fixedly connected to the upper clamp (1) of the universal testing machine, and the lower end is fixedly connected to the impact cutter head (203).

3. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 2, characterized in that, The adapter (201) is fixedly connected to the impact cutter head (203) via the protrusion (202).

4. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 1, characterized in that, The sample support (3) includes a lower support (304), the lower end of which is fixedly connected to the lower clamp (4) of the universal testing machine, and the upper end is fixedly provided with an upper support (302).

5. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 4, characterized in that, The upper end of the lower support (304) is provided with two upper supports (302) spaced apart, and the two upper supports (302) are arranged symmetrically.

6. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 5, characterized in that, The upper end of the lower support (304) is provided with a slide rail, and the lower end of the upper support (302) is fixedly provided with a slider (303) adapted to the slide rail.

7. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 5, characterized in that, The lower support (304) has a scale on its side for measuring the span between the two upper supports (302).

8. The auxiliary device for achieving adjustable-rate slow impact on a universal testing machine according to claim 4, characterized in that, An impact anvil (301) is provided at the upper end of the upper support (302).

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