In-situ uniaxial bidirectional impact performance testing device

Abstract

The utility model discloses an in-situ uniaxial bidirectional impact performance testing device which comprises a sample placing table, an incidence assembly, a pendulum bob mechanism and a measuring assembly, and a sample is placed on the sample placing table; the two groups of incident components are symmetrically arranged at the two ends of the sample in the length direction of the sample placing table; the two pendulum bob mechanisms are arranged at the two ends of the sample placing table; the measuring assembly is used for measuring and recording waveform changes in the impact process and strain and microscopic changes of the sample. According to the in-situ uniaxial bidirectional impact performance testing device disclosed by the embodiment of the utility model, through a uniaxial bidirectional in-situ impact test, in combination with an in-situ SEM microscopic observation and macroscopic full-field strain measurement system, an impact failure mechanism is comprehensively revealed from macroscopic and microscopic multi-angle, tensile, compression, plane shearing and anti-plane shearing fracture characteristics are researched, and the in-situ uniaxial bidirectional impact performance testing device is used for testing the impact failure performance of the device. The corresponding fracture criterion is established, and the method has important reference value for stability and safety evaluation of engineering protection.

Description

Technical Field

[0001] The utility model belongs to the technical field of material impact resistance detection, and in particular relates to an in-situ uniaxial bidirectional impact performance testing device. Background Art

[0002] Rocks and concrete are common building materials and important protective structures in underground shelters. Under the impact of high-speed ammunition and other energy, the destruction form and fracture characteristics of the shelter are important research contents in protective engineering, which have important engineering significance for blasting excavation, earthquake, mechanical impact and support structure. Common fracture modes of brittle materials are Type I (opening type), Type II (shearing type) and Type III (tearing type). In underground engineering, the rock is under high pressure, the opening crack may be suppressed, and the possibility of Type II and Type III fracture increases, which poses a huge threat to the safety and stability of the project. At the same time, due to the short impact time and high impact energy, the tensile, compression and shear failure mechanisms during the impact process are difficult to sort out.

[0003] At present, the common impact test for testing brittle materials adopts a method of applying an impact load at one end by using one end as a transmission rod and another end as an incident rod. During the impact process, the sample will undergo a relatively large displacement, so in-situ observation cannot be achieved, nor can impact destruction tests under such working conditions where the two ends are impacted relative to each other be achieved. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the embodiment of the utility model proposes an in-situ uniaxial bidirectional impact performance testing device, which can measure the mechanical response of various samples such as compression, splitting, plane shear, and anti-plane shear under different uniaxial bidirectional impact conditions, and can record the in-situ microstructural changes under impact loads through in-situ SEM microscopy and in-situ digital speckle observation technology, measure the full-field stress-strain response, and provide testing means and technical methods for revealing the dynamic failure mechanism of materials under impact loads.

[0005] According to the in-situ uniaxial and bidirectional impact performance testing device of the embodiment of the utility model, it includes: a sample placement table, on which a sample is placed; an incident component, which includes two groups, and the two groups of incident components are symmetrically arranged at both ends of the sample along the length direction of the sample placement table; a pendulum mechanism, which has two pendulum mechanisms, and the two pendulum mechanisms are arranged at both ends of the sample placement table; and a measuring component, which is used to measure and record the waveform changes of the impact process and the strain and microscopic changes of the sample.

[0006] According to the in-situ uniaxial and bidirectional impact performance testing device of the embodiment of the utility model, combined with the in-situ SEM microscopic observation and macroscopic full-field strain measurement system, the impact damage mechanism is comprehensively revealed from macroscopic and microscopic multi-angles, the tensile, compression, plane shear and anti-plane shear fracture characteristics are studied, and the corresponding fracture criteria are established, which has important reference value for the stability and safety evaluation of engineering protection.

[0007] Optionally, the incident assembly includes a striker, a shaper and an incident rod, the striker is connected to the incident rod through the shaper, and the sample is placed between two incident rods of two groups of the incident assemblies.

[0008] Optionally, the specimen includes a columnar specimen and a plate-shaped specimen containing cracks, and the incident rod includes a columnar incident rod and a plate-shaped incident rod corresponding to the specimen.

[0009] Optionally, a sample strain measuring element is pasted on the sample surface, and incident rod strain gauges are pasted on the surfaces of the two incident rods.

[0010] Optionally, the measuring component comprises a dynamic strain gauge, and the sample strain measuring element and the incident rod strain gauge are connected to the dynamic strain gauge via a wire.

[0011] Optionally, the measuring component further includes an oscilloscope, a computer, a high-speed non-contact full-field strain testing system and an in-situ SEM testing system, the dynamic strain gauge is connected to the oscilloscope, the oscilloscope is connected to the computer, and the high-speed non-contact full-field strain testing system and the in-situ SEM testing system are symmetrically arranged on both sides of the sample along the width direction of the sample placement table.

[0012] Optionally, the pendulum mechanism includes a bracket, a rotating shaft is arranged on the upper part of the bracket, the rotating shaft is connected to the pendulum rod, a pendulum head is arranged at the free end of the pendulum rod, and a plurality of pendulum fixers are also arranged on the bracket, and the pendulum rod can be placed on the pendulum fixers.

[0013] Optionally, the pendulum holder is movably arranged on the bracket between an extended position and a retracted position.

[0014] Optionally, the extended position refers to a position where the pendulum holder extends out of the bracket and can cooperate with the pendulum rod, and the retracted position refers to a position where the pendulum holder is retracted inside the bracket.

[0015] Optionally, a plurality of the pendulum fixers are arranged on the bracket in an arc shape and spaced apart, and the distance between the center of the pendulum fixer and the axis of the rotating shaft is smaller than the distance between the center of the pendulum head and the axis of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an in-situ uniaxial and bidirectional impact performance testing device according to an embodiment of the utility model.

[0017] Figure 2 It is a schematic diagram of a test specimen and a striker for an impact compression test of an embodiment of the utility model.

[0018] Figure 3 It is a schematic diagram of a test specimen and a striker for an impact splitting test according to an embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of a specimen and a striker for a plane impact shear test according to an embodiment of the utility model.

[0020] Figure 5 It is a schematic diagram of a specimen and a striker for an anti-plane impact shear test of an embodiment of the utility model.

[0021] Figure 6 It is a connection relationship diagram between the pendulum rod and the motor in the embodiment of the utility model.

[0022] Reference numerals:

[0023] Sample placement table 1; ground 101; fixing anchor bolts 102;

[0024] Sample 2; sample strain gauge 201; strain rosette 202; sample straight notch crack 203;

[0025] Pendulum mechanism 3; first bracket 301; first rotating shaft 302; first pendulum rod 303; first pendulum head 304; first pendulum fixture 305; first pendulum rod coaxial gear 306; first motor main shaft gear 307; first motor 308; second bracket 311; second rotating shaft 312; second pendulum rod 313; second pendulum head 314; second pendulum fixture 315; second pendulum rod coaxial gear 316; second motor main shaft gear 317; second motor 318;

[0026] Incident assembly 4; first impact rod 401; first shaper 402; first incident rod 403; first incident rod strain gauge 404; first incident rod impact surface 405; second impact rod 411; second shaper 412; second incident rod 413; second incident rod strain gauge 414; second incident rod impact surface 415;

[0027] Measuring component 5; high-speed non-contact full-field strain testing system 501; in-situ SEM testing system 502; dynamic strain gauge 503; oscilloscope 504; computer 505. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0029] like Figure 1-Figure 6 As shown, according to the in-situ uniaxial bidirectional impact performance testing device of the embodiment of the utility model, it includes: a sample placement table 1, a pendulum mechanism 3, an incident component 4 and a measuring component 5, and a sample 2 is placed on the sample placement table 1; the incident component 4 includes two groups, and the two groups of incident components 4 are symmetrically arranged at the two ends of the sample 2 along the length direction of the sample placement table 1, and the two groups of incident components 4 are used to synchronously or asynchronously impact the sample 2 located in the middle; utilizing the symmetric characteristics of the synchronous impact structure, in-situ observation of the sample 2 is realized, and impact destruction test under the condition of relative impact at both ends is realized; utilizing the asynchronous impact characteristics at both ends, the phase difference between the incident wave and the transmitted wave is constructed, the functional conversion of the transmission rod and the incident rod is realized, and the change law of the wave between the incident rod, the transmission rod and the sample is studied.

[0030] There are two pendulum mechanisms 3, which are arranged at both ends of the sample placement table 1. The pendulum mechanisms 3 are used for impact loading to give impact force to the incident component 4. The two pendulum mechanisms 3 can achieve synchronous impact and asynchronous impact on the incident component 4, and then achieve synchronous impact and asynchronous impact on the sample 2. The measuring component 5 is used to measure and record the waveform changes of the impact process and the strain and microscopic changes of the sample 2.

[0031] Reference below Figure 1-Figure 6 Briefly describe the method of using the in-situ uniaxial bidirectional impact performance test device of the embodiment of the utility model. First, place the sample 2 on the sample placement table 1, and set the corresponding incident components 4 at both ends of the sample 2. When performing a synchronous impact test, the two pendulum mechanisms 3 are set to synchronous impact, which is used to perform synchronous impact on the two groups of incident components 4; when performing an asynchronous test, the two pendulum mechanisms 3 are set to different impact time differences as needed, which is used to perform asynchronous impact on the two groups of incident components 4, and the measurement component 5 is used to measure and record the waveform changes in the impact process and the strain and microscopic changes of the sample 2.

[0032] According to the in-situ uniaxial and bidirectional impact performance testing device of the embodiment of the utility model, a pendulum is used to realize impact loading, and symmetry is used to construct a synchronous uniaxial and bidirectional impact loading device. The symmetric characteristics of the synchronous impact structure are used to measure the strain and microstructural changes at the symmetrical points of the sample. The asynchronism of the impact at both ends is used to construct the phase difference between the incident wave and the transmitted wave, and the functional conversion between the transmission rod and the incident rod is realized, so as to study the change law of the wave between the incident rod, the transmission rod and the sample.

[0033] like Figure 1-Figure 6As shown, the in-situ uniaxial bidirectional impact performance testing device according to the embodiment of the utility model includes: a sample placement table 1, a pendulum mechanism 3, an incident component 4 and a measuring component 5. The sample 2 is placed on the sample placement table 1. The sample 2 includes a columnar sample and a plate sample containing cracks. Specifically, the columnar sample includes a cylindrical sample and a quadrangular prism sample.

[0034] The incident component 4 includes a striker, a shaper and an incident rod. The striker is connected to the incident rod through the shaper, and the sample 2 is placed between the two incident rods of the two groups of incident components 4. The incident rod includes a columnar incident rod and a plate-shaped incident rod corresponding to the sample 2. The columnar incident rod and the columnar sample are a group, and the plate-shaped sample with cracks and the plate-shaped incident rod are a group. The setting of the shaper enables an ideal incident waveform to be obtained by adjusting the shape of the shaper.

[0035] Specifically, the two groups of incident components 4 include a first incident component and a second incident component, wherein the first incident component includes a first impact bar 401, a first shaper 402 and a first incident bar 403; the first impact bar 401 is connected to the first incident bar 403 through the first shaper 402. The second incident component includes a second impact bar 411, a second shaper 412 and a second incident bar 413; the second impact bar 411 is connected to the second incident bar 413 through the second shaper 412. The sample 2 is located between the first incident bar 403 and the second incident bar 413.

[0036] A sample strain measuring element is attached to the surface of sample 2, and the two incident rods are provided with incident rod strain gauges. The first incident rod 403 contains a first incident rod strain gauge 404; the second incident rod 413 contains a second incident rod strain gauge 414. Specifically, when sample 2 is a columnar sample, the sample strain measuring element attached to the surface of sample 2 is a sample strain gauge 201; when sample 2 is a plate sample with cracks, the sample contains a sample straight notch crack 203, and the sample strain measuring element attached to the surface of sample 2 is a strain flower 202, and the strain flower 202 is located at the tip of the sample crack.

[0037] The measuring assembly 5 includes a dynamic strain gauge 503, an oscilloscope 504, a computer 505, a high-speed non-contact full-field strain test system 501 and an in-situ SEM test system 502. The sample strain measuring element and the incident rod strain gauge are connected to the dynamic strain gauge 503 through a wire, the dynamic strain gauge 503 is connected to the oscilloscope 504, and the oscilloscope 504 is connected to the computer 505, which is used to record and analyze the waveform propagation of the entire impact process. The high-speed non-contact full-field strain test system 501 and the in-situ SEM test system 502 are symmetrically arranged on both sides of the sample 2 along the width direction of the sample placement table 1. The full-field strain of the sample 2 will be recorded by the high-speed non-contact full-field strain test system 501, and the full-field strain response will be measured. The in-situ SEM test system 502 is aligned with the middle point of the sample 2 to perform in-situ microstructure testing.

[0038] The pendulum mechanism 3 comprises a bracket, which is fixed on the ground 101 by a fixed anchor bolt 102. A rotating shaft is arranged on the upper part of the bracket, which is connected to a pendulum rod, and the pendulum rod can rotate around the rotating shaft. A pendulum head is arranged at the free end of the pendulum rod. A plurality of pendulum fixers are also arranged on the bracket, and the pendulum rod can be placed on the pendulum fixers. A plurality of pendulum fixers are arranged on the bracket in an arc shape and spaced apart, and the distance between the center of the pendulum fixer and the axis of the rotating shaft is less than the distance between the center of the pendulum head and the axis of the rotating shaft. A plurality of pendulum fixers are arranged in an arc shape and spaced apart, so that the pendulum heads can fall from different heights, thereby achieving different impact forces. When the two pendulum heads of the two pendulum mechanisms 3 fall from different heights at the same time, an asynchronous impact can be achieved, and when the two pendulum heads fall from the same height at the same time, a synchronous impact can be achieved.

[0039] The free end of the striker corresponds to the axis of the rotating shaft in the vertical direction, and the distance between the center of the end face of the free end of the striker and the axis of the rotating shaft is equal to the distance between the center of the pendulum head and the axis of the rotating shaft, thereby ensuring that the pendulum head can impact the striker when it falls, giving impact force to the incident component 4.

[0040] The pendulum holder is movably arranged on the bracket between an extended position and a retracted position. The extended position refers to a position where the pendulum holder extends out of the bracket and can cooperate with the pendulum rod, and the retracted position refers to a position where the pendulum holder is retracted inside the bracket. When the pendulum holder is in the extended position, the pendulum rod is placed on the pendulum holder; when the pendulum holder is in the retracted position, the pendulum rod is separated from the pendulum holder.

[0041] Both pendulum holders are driven by electromagnetic valves to extend and retract. The two sets of electromagnetic valves are connected by wires and are started and closed by the same switch to enable the pendulum holders in the two sets of pendulum mechanisms 3 to extend and retract synchronously.

[0042] Optionally, the rotating shaft is coaxially connected with the pendulum coaxial gear, the pendulum coaxial gear is meshed with the motor main shaft gear, and the motor main shaft gear is connected to the output shaft of the motor. Start the motor, the motor main shaft gear rotates, the motor main shaft gear drives the pendulum coaxial gear to rotate, and the pendulum coaxial gear drives the pendulum rod to rise upward through the rotating shaft. After reaching the specified height, the solenoid valve controls the pendulum holder to extend, so that the pendulum holder is in the extended position, and the pendulum rod is placed on the pendulum holder, thereby fixing the pendulum rod at the impact height, and then the motor power is turned off. When the pendulum rod needs to be released, the solenoid valve is operated to retract the pendulum holder, that is, the pendulum holder is in the retracted position, and the pendulum rod starts to swing freely from this height, and the pendulum head impacts the collision rod when it reaches the lowest end.

[0043] Specifically, the pendulum mechanism 3 includes a first bracket 301 and a second bracket 311; a first rotating shaft 302 is arranged on the first bracket 301, the first rotating shaft 302 is connected to the first pendulum rod 303, and a first pendulum head 304 is arranged at the free end of the first pendulum rod 303; a plurality of first pendulum fixers 305 are arranged on the first bracket 301; the first rotating shaft 302 is coaxially connected to the first pendulum rod coaxial gear 306; the first pendulum rod coaxial gear 306 is meshed with the first motor main shaft gear 307; the first motor main shaft gear 307 is connected to the output shaft of the first motor 308.

[0044] A second rotating shaft 312 is arranged on the second bracket 311, and the second rotating shaft 312 is connected to the second pendulum rod 313, and a second pendulum head 314 is arranged at the free end of the second pendulum rod 313; a plurality of second pendulum fixers 315 are arranged on the second bracket 311; the second rotating shaft 312 is coaxially connected to the second pendulum rod coaxial gear 316; the second pendulum rod coaxial gear 316 is meshed with the second motor main shaft gear 317; the second motor main shaft gear 317 is connected to the output shaft of the second motor 318.

[0045] Reference below Figure 1-Figure 6 , the operation process of the in-situ uniaxial biaxial impact performance testing device of the embodiment of the utility model,

[0046] 1) Synchronous energy impact: lift the two pendulum rods to the same height, release the two pendulum rods at the same time, so that the two pendulum heads swing to the lowest position at the same time, the two pendulum heads can obtain the same impact energy and impact speed, the two pendulum heads hit the corresponding two impact rods at the same time, so that the two impact rods hit the two shapers at the same time, and the two shapers hit the two incident rods at the same time under the action of the two impact rods, forming a synchronous energy impact compression load. During the impact process, the deformation of the incident rod strain gauges of the two incident rods and the deformation of the strain measurement element on the surface of the sample 2 will be recorded and input into the computer 505 through the dynamic strain gauge 503 and the oscilloscope 504 for data processing. At the same time, the full-field strain of the sample 2 will be recorded by the high-speed non-contact full-field strain test system 501, and the full-field strain response will be tested. Because it is a synchronous impact and the same energy impact, under the condition of absolute symmetry, the position of the middle point of the sample 2 will not change during the impact process, so the in-situ SEM test system 502 can be used to align this point for in-situ microstructure testing.

[0047] 2) Asynchronous impact with different energies: The first pendulum rod 303 and the second pendulum rod 313 are lifted to different heights. Due to the different heights, the time taken for the first pendulum head 304 and the first pendulum head 314 to fall freely to the lowest point is different. The time taken for the first pendulum head 304 and the second pendulum head 314 to fall to the lowest point at different heights is calculated to obtain the time difference between the impacts of the two pendulum heads, which is the phase difference between the shock waves of the first pendulum head 304 and the second pendulum head 314. At the same time, the first pendulum head 304 and the second pendulum head 314 are released, so that the first pendulum head 304 and the second pendulum head 314 can swing freely to the lowest position, and the first pendulum head 304 and the second pendulum head 314 obtain different impact energies and impact speeds. It is assumed that the first pendulum head 304 first hits the first impact rod 401, and the first impact rod 401 hits the first shaper 402 first, and after passing through the first shaper 402, an ideal incident waveform is obtained. The first shaper 402 hits the first incident rod 403 under the action of the first impact rod 401, and the first incident rod 403 hits the sample 2 again, and the sample 2 is impact-deformed. The shock wave propagates in the sample 2 and the second incident rod 413, and the second incident rod 413 becomes a transmission rod. After a time difference, the second pendulum head 314 hits the second impact rod 411, and the second impact rod 411 hits the second shaper 41 2. After passing through the second shaper 412, an ideal incident waveform is obtained. The second shaper 412 then hits the second incident rod 413. At this time, a waveform conversion from a projection rod to an incident rod is formed in the second incident rod 413. During the impact process, the deformation of the first incident rod strain gauge 404 and the second incident rod strain gauge 414 in the first incident rod 403 and the second incident rod 413 will be recorded and input into the computer 505 for data processing through the dynamic strain gauge 503 and the oscilloscope 504. The waveform propagation of the entire impact process will be recorded and analyzed, and the deformation of the strain measurement element on the surface of the sample 2 will be recorded and input into the computer 505 for data processing through the dynamic strain gauge 503 and the oscilloscope 504. At the same time, the full-field strain of the sample 2 will be recorded by the high-speed non-contact full-field strain test system 501, and the full-field strain response can be obtained by testing. Through different impact time differences and impact energies, the full-field strain response of the sample can be combined to analyze the impact response of the sample during asynchronous impact and the propagation law of the shock wave in the system.

[0048] Example 1 Impact Compression Test

[0049] like Figure 2 As shown, sample 2 is a quadrangular prism sample, a sample strain gauge 201 is pasted on the surface of sample 2, the incident rod is a columnar incident rod, and an incident rod strain gauge is pasted on the surface of the incident rod. According to the operation of the above-mentioned in-situ uniaxial bidirectional impact performance test device, synchronous energy impact and asynchronous different energy impact are carried out, and the test results are recorded.

[0050] Example 2 Impact splitting test

[0051] like Figure 3 As shown, sample 2 is a cylindrical sample, a sample strain gauge 201 is pasted on the surface of sample 2, the incident rod is a cylindrical incident rod, and an incident rod strain gauge is pasted on the surface of the incident rod. According to the operation of the above-mentioned in-situ uniaxial bidirectional impact performance test device, synchronous energy impact and asynchronous different energy impact are carried out, and the test results are recorded.

[0052] Example 3 Plane impact shear test

[0053] like Figure 4 As shown, sample 2 is a plate-shaped sample with cracks, and sample 2 contains a straight notch crack 203. The sample strain measuring element is a strain rosette 202, and the strain rosette 202 is located at the tip of the sample crack. Sample 2 is placed horizontally, the incident rod is a plate-shaped incident rod, and the end shapes of the two incident rods are different. When the end of the first incident rod 403 is a convex block, the end of the second incident rod 413 is provided with a groove, the end of the convex block of the first incident rod 403 is the first incident rod impact surface 405, and the two sides of the end groove of the second incident rod 413 are the second incident rod impact surface 415, and impact with the corresponding position surface on sample 2. According to the operation of the above-mentioned in-situ uniaxial bidirectional impact performance test device, synchronous energy impact and asynchronous different energy impact are carried out, and the test results are recorded.

[0054] Example 4 Anti-plane impact shear test

[0055] like Figure 5 As shown, sample 2 is a plate-shaped sample with cracks, and sample 2 contains a straight notch crack 203. The sample strain measuring element is a strain rosette 202, and the strain rosette 202 is located at the tip of the sample crack. Sample 2 is placed vertically, the incident rod is a plate-shaped incident rod, and the end shapes of the two incident rods are different. When the end of the first incident rod 403 is a convex block, the end of the second incident rod 413 is provided with a groove, the end of the convex block of the first incident rod 403 is the first incident rod impact surface 405, and the two sides of the end groove of the second incident rod 413 are the second incident rod impact surface 415, and impact with the corresponding position surface on sample 2. According to the operation of the above-mentioned in-situ uniaxial bidirectional impact performance test device, synchronous energy impact and asynchronous different energy impact are carried out, and the test results are recorded.

[0056] The strain data of the first incident rod strain gauge 404 and the second incident rod strain gauge 414 measured in the experiment can be processed for stress and strain according to the two-wave method. According to the one-dimensional stress fluctuation theory, the average strain rate, average strain, and average stress of the sample 2 during the test are:

[0057]

[0058]

[0059]

[0060] Introducing the uniformity assumption, it can be rewritten as:

[0061]

[0062]

[0063]

[0064] Where c, E, and A are the elastic wave velocity, elastic modulus, and cross-sectional area of ​​the first incident rod 403 and the second incident rod 413, respectively. s , A s is the length and cross-sectional area of ​​specimen 2, ε I , ε R , ε T They are respectively the incident wave, the reflected wave and the transmitted wave measured according to the first incident rod strain gauge 404 and the second incident rod strain gauge 414 .

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An in-situ uniaxial biaxial impact performance testing device, characterized in that: include: A sample placement table, on which a sample is placed; An incident component, the incident component comprising two groups, the two groups of incident components being symmetrically arranged at two ends of the sample along the length direction of the sample placement table; A pendulum mechanism, wherein there are two pendulum mechanisms, and the two pendulum mechanisms are arranged at two ends of the sample placement table; and The measuring component is used to measure and record the waveform changes during the impact process and the strain and microscopic changes of the sample.

2. The in-situ uniaxial and biaxial impact performance testing device according to claim 1, characterized in that: The incident assembly comprises a striker, a shaper and an incident rod, the striker is connected to the incident rod through the shaper, and the sample is placed between two incident rods of two groups of the incident assemblies.

3. The in-situ uniaxial and biaxial impact performance testing device according to claim 2, characterized in that: The specimens include a columnar specimen and a plate-shaped specimen containing cracks, and the incident rods include a columnar incident rod and a plate-shaped incident rod corresponding to the specimens.

4. The in-situ uniaxial and biaxial impact performance testing device according to claim 3, characterized in that: A sample strain measuring element is pasted on the sample surface, and incident rod strain gauges are pasted on the surfaces of the two incident rods.

5. The in-situ uniaxial and biaxial impact performance testing device according to claim 4, characterized in that: The measuring assembly comprises a dynamic strain gauge, and the sample strain measuring element and the incident rod strain gauge are connected to the dynamic strain gauge via a wire.

6. The in-situ uniaxial and biaxial impact performance testing device according to claim 5, characterized in that: The measuring component further includes an oscilloscope, a computer, a high-speed non-contact full-field strain testing system and an in-situ SEM testing system. The dynamic strain gauge is connected to the oscilloscope, and the oscilloscope is connected to the computer. The high-speed non-contact full-field strain testing system and the in-situ SEM testing system are symmetrically arranged on both sides of the sample along the width direction of the sample placement table.

7. The in-situ uniaxial and biaxial impact performance testing device according to claim 1, characterized in that: The pendulum mechanism comprises a bracket, a rotating shaft is arranged on the upper part of the bracket, the rotating shaft is connected to the pendulum rod, a pendulum head is arranged at the free end of the pendulum rod, and a plurality of pendulum fixers are also arranged on the bracket, and the pendulum rod can be placed on the pendulum fixers.

8. The in-situ uniaxial and biaxial impact performance testing device according to claim 7, characterized in that: The pendulum holder is movably arranged on the bracket between an extended position and a retracted position.

9. The in-situ uniaxial and biaxial impact performance testing device according to claim 8, characterized in that: The extended position refers to a position where the pendulum holder extends out of the bracket and can cooperate with the pendulum rod, and the retracted position refers to a position where the pendulum holder is retracted inside the bracket.

10. The in-situ uniaxial and biaxial impact performance testing device according to claim 7, characterized in that: A plurality of pendulum fixers are arranged on the bracket in an arc shape and spaced apart from each other, and the distance between the center of the pendulum fixer and the axis of the rotating shaft is smaller than the distance between the center of the pendulum head and the axis of the rotating shaft.

Images