CN114397205A - A kind of impact force testing device and method - Google Patents

Abstract

The invention discloses an impact force testing device and method, and relates to the technical field of impact testing. The impact force testing device comprises a rack, a mounting assembly, an impact piece, a first detection piece, a second detection piece and an image acquisition assembly. The installation component is arranged on the rack and used for installing the sample. The impact piece is rotatably arranged on the frame. The first detection piece is arranged on the impact piece and used for acquiring acting force applied to the sample by the impact piece. The second detection piece is connected with the impact piece, and the second detection piece is used for obtaining the rotating speed of the impact piece. The image acquisition assembly is arranged on the rack and can acquire image information of the sample in different directions simultaneously. The impact force testing device can improve the collection parameter range of the impact force test on the sample, and is convenient for realizing comprehensive, objective and deep analysis and research on the failure mechanism of the sample.

Description

A kind of impact force testing device and method

technical field

The invention relates to the technical field of impact testing, in particular to an impact force testing device and method.

Background technique

Digital cantilever beams and simply supported beams are mainly used for the determination of the impact toughness of non-metallic materials such as rigid thermoplastic molding and extrusion materials, rigid thermosetting molding materials, and fiber-reinforced thermosetting and thermoplastic composite materials. It consists of fuselage, impact pendulum, sample support, measuring device, operating mechanism and other parts.

The disadvantage of this technique is that: the existing instruments are generally suitable for characterizing impact behavior with impact strength only, and only impact strength or impact fracture energy are obtained; and the potential energy of the impact testing machine is required to approximately match the fracture energy of the sample to be tested. In the end, the manual look-up table or digital display can only obtain a result value representing the fracture toughness of the material, and it is impossible to obtain the key information parameters such as load-deflection, impact energy-time and other key information parameters in the whole process. Key data and information such as stress-strain, deflection-load, etc., which produce elastic deformation-plastic damage-complete fracture process, are missing. The traditional impact test fracture method cannot obtain the important change information such as microcrack initiation, crack extension, delamination and penetration, fiber breaking, matrix compression deformation, interface debonding slip and so on during the impact process with high precision, nor can it be obtained in the fine Conduct a comprehensive, objective and in-depth analysis and research on the failure mechanism of the material on the viewing image and dynamic video.

Therefore, there is an urgent need for an impact force testing device and method to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an impact force testing device and method, which can improve the collection parameter range of the impact force test on the sample, and facilitate the comprehensive, objective and in-depth analysis and research on the failure mechanism of the sample.

For realizing above-mentioned technical effect, technical scheme of the present invention is as follows:

An impact force testing device, comprising: a frame; an installation assembly, the installation assembly is arranged on the frame, the installation assembly is used for installing a sample; an impact piece, the impact piece is rotatably arranged on the on the frame; a first detection piece, the first detection piece is arranged on the impact piece, and the first detection piece is used to obtain the force exerted by the impact piece on the sample; the second detection piece A detection piece, the second detection piece is connected with the impact piece, and the second detection piece is used to obtain the rotational speed of the impact piece; an image acquisition component, the image acquisition component is arranged on the frame, and the The image acquisition component can simultaneously acquire image information of the sample.

Further, the first side of the impact piece is disposed toward the mounting assembly, the second side of the impact piece is disposed away from the mounting assembly, and the first detection piece is disposed on the second side of the impact piece.

Further, the mounting assembly includes two mounting parts arranged at intervals, a plurality of mounting parts are respectively provided on the two mounting parts, and the plurality of the mounting parts on the two mounting parts are respectively arranged in a one-to-one correspondence .

Further, the mounting member includes a mounting frame and a locking member, the mounting portion is movably arranged on the mounting frame along the distribution direction of the two mounting members, and the locking member is used to lock the mounting member. The mounting portion is locked on the mounting bracket.

Further, the first side of the sample is disposed toward the impact member, and the second side of the sample is disposed away from the impact member; the image acquisition assembly includes: a first acquisition member, the first acquisition A second collection piece is arranged on the rack and used to acquire the image information of the first side of the sample; the second collection piece is arranged on the rack and used to acquire the first side of the sample. The image information of the two sides; the third collecting part, the third collecting part is arranged on the rack and can acquire the image information of the bottom side of the sample.

Further, the image acquisition assembly further includes a reflective member, the reflective member is arranged on the rack and located below the sample, and the reflective member can reflect the image information on the bottom side of the sample to the third collection piece.

Further, the impact force testing device further includes a supplementary light component, and the supplementary light component is used for irradiating light to the sample.

Further, the rack includes: a main body, the main body defines an accommodating cavity, and the impact piece and the mounting assembly are both arranged in the accommodating cavity; a protective door, the protective door is movably arranged in the accommodating cavity the open end of the accommodating cavity.

Further, the impact member includes: a driving member, which is arranged on the frame; a swing rod, one end of the swing rod is connected to the output end of the driving member, and the driving member can drive the The swing rod rotates and keeps the angle between the swing rod and the horizontal direction fixed; the impact blade is connected to the other end of the swing rod; the solenoid valve is used to control the driving member The swing lever is released so that the swing lever drives the impact blade to impact the specimen.

An impact force testing method, based on the aforementioned impact force testing device, includes: a first detection part, a second detection part and an image acquisition component respectively acquire working signals and start to collect force, rotational speed and image information respectively; Obtain the working signal and rotate the impact sample; obtain the relationship curve between the impact energy and time received by the impact piece; the first detection piece, the second detection piece and the image acquisition component respectively stop collecting the force, speed and image information after a preset time .

The beneficial effects of the present invention are:

The mounting assembly can carry the sample stably and reliably, so that the impact member can keep its position unchanged when impacting the sample, so that the first detection member, the second detection member and the image acquisition assembly can collect reliable information of the sample. The first detection part can acquire the force exerted by the impact part on the sample, the second detection part can acquire the rotational speed of the impact part, and the image acquisition component can simultaneously acquire image information of the sample in different orientations. Therefore, in the whole impact process, the deflection and force value of the sample can be calculated more reliably through the force and rotational speed recorded by the first detection piece and the second detection piece, as well as the parameters of the impact piece and the sample itself. , stress, strain and other parameters, so as to record the deflection-force value, stress-strain or force-time curve during the entire impact process; at the same time, the image acquisition component can obtain the deformation or fracture of the sample during the entire impact process. Photographs of the morphology, and can obtain the fracture characteristics of each side of the sample when it is impacted, such as microcrack initiation, crack extension, delamination and penetration, as well as fiber breaking, matrix compressive deformation, interface debonding slip and other important change information , another example is the fracture characteristics of lateral impact, through-layer impact, vertical direction and parallel impact. As a result, the change of the obtained impact deflection-load curve, combined with the synchronous fracture morphology characteristics collected by the image acquisition component, can more objectively and comprehensively analyze the fracture mode and fracture characteristics of the sample, such as rapid judgment of ductile fracture. , brittle fracture and crush fracture.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

1 is a schematic structural diagram of an impact force testing device provided by a specific embodiment of the present invention;

2 is a schematic diagram of a partially exploded structure of an impact force testing device provided by a specific embodiment of the present invention;

3 is a schematic diagram of a partial structure of a rack provided by a specific embodiment of the present invention;

FIG. 4 is a schematic diagram of a partial structure of a mounting assembly provided by a specific embodiment of the present invention;

5 is one of the test result diagrams of the impact force testing method provided by the specific embodiment of the present invention;

6 is the second test result diagram of the impact force test method provided by the specific embodiment of the present invention;

FIG. 7 is the third test result diagram of the impact force testing method provided by the specific embodiment of the present invention.

reference number

1. Rack; 11. Main body; 12. Protective door; 13. Upright column; 14. Collection support; 15. Support foot; 2. Mounting assembly; 21. Mounting piece; 211. Mounting frame; 212. Locking piece; 22 , installation part; 221, installation groove; 3, impact piece; 31, drive piece; 32, swing rod; 33, impact blade; 34, solenoid valve; 4, first detection piece; 5, image acquisition component; 51, first A collection piece; 52, a second collection piece; 53, a third collection piece; 54, a reflector; 6, a fill light.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

It is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", "Radial", " The orientation or positional relationship indicated such as "circumferential direction" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, It is constructed and operated in a particular orientation and is therefore not to be construed as a limitation of the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

The specific structure of the impact force testing device according to the embodiment of the present invention will be described below with reference to FIG. 1 to FIG. 4 .

As shown in FIGS. 1-4 , FIG. 1 discloses an impact force testing device, which includes a frame 1 , a mounting component 2 , an impact component 3 , a first detection component 4 , a second detection component and an image acquisition component 5 . The mounting assembly 2 is provided on the rack 1, and the mounting assembly 2 is used to mount the sample. The impact piece 3 is rotatably arranged on the frame 1 . The first detection piece 4 is arranged on the impact piece 3, and the first detection piece 4 is used to obtain the force exerted by the impact piece 3 on the sample. The second detection piece is connected to the impact piece 3 , and the second detection piece is used to acquire the rotational speed of the impact piece 3 . The image acquisition component 5 is provided on the rack 1, and the image acquisition component 5 can acquire image information of the sample at the same time.

It can be understood that the mounting assembly 2 can carry the sample stably and reliably, so that the impact member 3 can keep its position unchanged when impacting the sample, so that the first detection member 4 , the second detection member and the image acquisition component 5 can collect the sample. Reliable information on specimens. The first detector 4 can acquire the force exerted by the impactor 3 on the sample, the second detector can acquire the rotational speed of the impactor 3, and the image acquisition component 5 can simultaneously acquire image information of the sample in different orientations. Therefore, in the whole impact process, the deflection, the rotation speed of the first detection piece 4 and the second detection piece, and the parameters of the impact piece 3 and the sample can be calculated reliably. Changes in parameters such as force value, stress, strain, etc., to record the deflection-force value, stress-strain or force-time curve during the entire impact process; at the same time, the image acquisition component 5 can obtain the sample during the entire impact process. Photographs of deformation or fracture morphology, and can obtain the fracture characteristics of each side of the sample when it is impacted, such as microcrack initiation, crack extension, delamination and penetration, fiber breaking, matrix compression deformation, interfacial debonding slip, etc. Important variation information, such as lateral impact, through-layer impact, vertical and parallel impact fracture characteristics. In this way, through the change of the obtained impact deflection-load curve, combined with the synchronous fracture topography characteristics collected by the image acquisition component 5, the fracture mode and fracture characteristics of the sample can be analyzed more objectively and comprehensively, such as quick judgment of toughness. Fracture, brittle fracture and crush fracture.

According to the impact force testing device of this embodiment, the acquisition parameter range of the impact force test on the sample can be better improved, and the important change information of each impact surface of the sample can be obtained on the mesoscopic image and dynamic video recording, which is convenient to realize the impact force test of the sample. A comprehensive, objective and in-depth analysis and study of the failure mechanism of the sample is carried out.

In some embodiments, as shown in FIG. 1 , the first side of the impact member 3 is disposed toward the mounting assembly 2 , the second side of the impact member 3 is disposed away from the mounting assembly 2 , and the first detection member 4 is disposed on the first side of the impact member 3 . two sides.

It can be understood that, if the first detection member 4 is arranged on the first side of the impact member 3, when the impact member 3 impacts the sample, although the first detection member 4 can obtain the impact force on the sample, it also has It may cause damage to the first detection member 4, and at the same time, the error of the obtained impact force is also relatively large. In the present embodiment, the first detection member 4 disposed on the second side can obtain the impact force acting on the sample by the impact force through the reaction force of the impact member 3, so as to ensure that the first detection member 4 detects the impact force of the impact force. Accuracy, and can prevent the problem of damage to the first detection piece 4 during the detection process.

Specifically, in this embodiment, the first detection member 4 may be set as a force sensor.

In some embodiments, as shown in FIG. 1 and FIG. 2 , the mounting assembly 2 includes two mounting parts 21 arranged at intervals, a plurality of mounting parts 22 are respectively provided on the two mounting parts 21 , and the two mounting parts 21 are respectively provided with a plurality of mounting parts 22 . The plurality of mounting parts 22 are provided in a one-to-one correspondence, respectively.

It can be understood that the two ends of the sample can be respectively installed on one mounting part 22 on one mounting member 21, so as to realize the stable installation of the sample on the mounting assembly 2, and the mounting part 22 is provided with multiple, multiple The mounting part 22 can realize the mounting of the sample at different positions on the mounting assembly 2, so as to improve the applicable scope of the test. In addition, since the two mounting parts 21 are arranged at intervals, the image acquisition component 5 can collect the image information of the sample located between the two mounting parts 21 , which facilitates the acquisition of the image information of the sample.

Specifically, the plurality of mounting portions 22 on each mounting member 21 are arranged at intervals in the vertical direction.

Specifically, as shown in FIG. 4 , a mounting groove 221 is provided on the side of the mounting portion 22 to facilitate the mounting of the end portion of the fixed sample. When the impact member 3 impacts the sample, the upper side, the lower side of the sample and the side away from the impact One side of the component 3 can also be under the limit of the installation groove 221, so as to prevent the sample from falling off under the action of impact.

In some embodiments, as shown in FIGS. 1 and 2 , the mounting member 21 includes a mounting frame 211 and a locking member 212 , and the mounting portion 22 is movably disposed on the mounting frame 211 along the distribution direction of the two mounting members 21 , The locking member 212 is used for locking the mounting portion 22 on the mounting bracket 211 .

It can be understood that since the mounting portion 22 can be movably arranged, samples of different lengths can be mounted on the mounting assembly 2, and the locking member 212 can lock the mounting portion 22 on the mounting frame 211 to ensure that the When the length can be adjusted, the reliable installation of the sample can be ensured.

Specifically, the locking member 212 includes a locking wrench, and the locking wrench is threadedly connected to the mounting bracket 211 and the mounting portion 22 to achieve a locking effect.

In some embodiments, as shown in FIGS. 1 and 2 , the first side of the sample is positioned toward the impact member 3 and the second side of the sample is positioned away from the impact member 3 . The image capturing assembly 5 includes a first capturing member 51 , a second capturing member 52 and a third capturing member 53 . The first acquisition part 51 is provided on the rack 1 and is used to acquire image information of the first side of the sample. The second acquisition part 52 is provided on the rack 1 and is used for acquiring image information of the second side of the sample. The third acquisition part 53 is provided on the rack 1 and can acquire image information of the bottom side of the sample.

It can be understood that, by setting the first collecting member 51 , the second collecting member 52 and the third collecting member 53 , three typical positions of the sample on the impact member 3 , such as the incident surface, the exit surface and the fracture surface, can be acquired in real time. Deformed HD video images.

Specifically, in this embodiment, the first collection member 51 , the second collection member 52 and the third collection member 53 can all be configured as CCD cameras or high-speed cameras.

Specifically, as shown in FIG. 1 and FIG. 2 , the rack 1 further includes a collection support 14 , and the collection support 14 is used to support the first collection member 51 , the second collection member 52 and the third collection member 53 .

In some embodiments, as shown in FIG. 1 and FIG. 2 , the image acquisition assembly 5 further includes a reflector 54 . The reflector 54 is arranged on the frame 1 and is located below the sample, and the reflector 54 can attach the bottom of the sample The image information on the side is reflected to the third collecting element 53 .

It can be understood that, through the setting of the reflector 54, the third collecting member 53 can acquire the image information of the bottom side of the sample without being arranged under the sample, thereby effectively reducing the impact of the third collecting member 53 under the sample. The space is occupied, the integration degree of the whole device is improved, and at the same time, the problem of accidental damage to the third collecting member 53 by the impact member 3 can be prevented, and the service life of the device can be prolonged.

Specifically, the reflector 54 includes a high-definition prism capable of realizing 90° refraction, such as a 45° prism.

In some embodiments, as shown in FIG. 1 and FIG. 2 , the impact force testing device further includes a supplementary light component, and the supplementary light component is used for irradiating light to the sample.

It can be understood that the supplementary light component can provide a better image acquisition environment, thereby effectively improving the clarity of the image of the sample collected by the image acquisition component 5 and facilitating the data analysis of the sample.

Specifically, as shown in FIG. 2 , the supplementary light assembly includes a plurality of supplementary light lamps 6 , and the plurality of supplementary light lamps 6 are arranged around the sample according to the actual needs of the sample.

In some embodiments, as shown in FIGS. 1 and 3 , the rack 1 includes a body 11 and a protective door 12 . The body 11 defines an accommodating cavity, and the impact piece 3 and the mounting assembly 2 are both disposed in the accommodating cavity. The protective door 12 is movably provided at the open end of the accommodating cavity.

It can be understood that the protective door 12 can play a reliable protective effect, so as to better ensure the safety of the impact force test.

Specifically, the rack 1 further includes support feet 15 , and the support feet 15 are provided on the bottom wall of the main body 11 .

In some embodiments, as shown in FIG. 2 , the impact member 3 includes a driving member 31 , a swing rod 32 , an impact blade 33 and a solenoid valve 34 . The driving member 31 is arranged on the frame 1 . One end of the swing rod 32 is connected to the output end of the driving member 31 , and the driving member 31 can drive the swing rod 32 to rotate and keep the included angle between the swing rod 32 and the horizontal direction fixed. The impact blade 33 is connected to the other end of the swing lever 32 . The solenoid valve 34 is used to control the driver 31 to release the swing rod 32 so that the swing rod 32 drives the impact blade 33 to impact the sample.

It can be understood that the setting of the solenoid valve 34 can better control the driving member 31, and can make the driving member 31 drive the swing rod 32 to maintain the preset angle, so as to realize the condition that the impact edge 33 is at different angles. drop and complete the impact on the specimen.

Specifically, as shown in FIG. 1 and FIG. 3 , the rack 1 further includes a column 13 , and the driving member 31 and the solenoid valve 34 are both disposed on the column 13 .

In some specific embodiments, the second detection element is a photoelectric encoder. The photoelectric encoder is connected to the driving member 31 to obtain the output rotation speed of the driving member 31 and then the rotation speed of the swing rod 32 and the impact blade 33 .

The present invention also discloses an impact force testing method, which is based on the aforementioned impact force testing device, comprising: the first detection part 4, the second detection part and the image acquisition component 5 respectively acquire working signals and start to collect the acting force, Speed and image information; the impact piece 3 obtains the working signal and rotates the impact sample; obtains the relationship curve between the impact energy received by the impact piece 3 and time; the first detection piece 4 , the second detection piece and the image acquisition component 5 are at a preset time Then stop collecting force, speed and image information respectively.

According to the impact force testing method of the embodiment of the present invention, due to the impact force testing device described above, the acquisition parameter range of the impact force test on the sample can be better improved, and the sample can be obtained on the mesoscopic image and dynamic video recording. The important change information of each impact surface is easy to carry out a comprehensive, objective and in-depth analysis and research on the failure mechanism of the sample.

Specifically, the impact force testing method using the aforementioned impact force testing device includes:

Click the software start button on the man-machine interface, and the software sends a signal relay. The relay sends out a synchronous working signal, so that the image acquisition component 5, the first detection part 4 and the second detection part work to collect data at the same time. The image acquisition component 5 acquires the video image of the impact deformation of the sample in real time. The high-speed signal collector starts to collect the signals of the first detection element 4 and the second detection element. Impact piece 3 hem and impact the specimen.

Use the photoelectric encoder to obtain the impact speed, and use the force sensor to obtain the impact force. To draw the curve graph of force and time, the deflection can be calculated by the quadratic integral of a pair of force-time curves by the following formula, and the curve of force-deflection can be drawn.

计算而得，其中，t为冲击后用于计算挠度的时间，单位为秒(s)；s(t)为冲击后在t时试样的挠度，单位为米(m)；ν₀为冲击速度，单位为米每秒(m/s)；L_P为冲击件3的摆长，单位为米(m)；M_H为冲击件3的水平力矩，单位为牛顿米(N·s)；F(t)为冲击后在t时测得的力，单位为牛顿(N)；mc为载能体的质量，单位为千克(kg)；g为当地的重力加速度，单位为米每二次方秒(m/s2)。Specifically, the deflection of the impact piece 3 is based on formula 1:

Calculated, where t is the time used to calculate the deflection after the impact, in seconds (s); s(t) is the deflection of the sample at t after the impact, in meters (m); ν ₀ is the impact Speed, in meters per second (m/s); L _P is the pendulum length of the impact piece 3, in meters (m); MH is the horizontal moment of the impact piece 3, in Newton meters ( _N s); F(t) is the force measured at t after the impact, in Newtons (N); mc is the mass of the energy carrier, in kilograms (kg); g is the local acceleration of gravity, in meters per second Square seconds (m/s2).

即可计算在达到一定挠度所消耗的能力，最后根据试样的尺寸获取试样的冲击能量，W_j为规定挠度下的能量，单位为焦耳(J)；s_j为力-挠度曲线上的某个点；s为挠度，单位为米(m)；F为力，单位为牛顿(N)。After obtaining the force-deflection curve of the specimen, formula 2

The energy consumed in reaching a certain deflection can be calculated, and finally the impact energy of the sample can be obtained according to the size of the sample, W _j is the energy under the specified deflection, the unit is Joule (J); s _j is the force-deflection curve on the curve A point; s is deflection in meters (m); F is force in Newtons (N).

Data collection stops after 1 second.

The application software imports data and video pictures. Since the image acquisition component 5, the first detection element 4 and the second detection element are all acquired synchronously, their data starting points are the same, and the curves and video pictures are marked with time. The software finds the initial impact time point through the curve waveform of the first acquisition piece 51, and then automatically matches the impact force curve of the second acquisition piece 52 with the impact video image, so that the feature points on the curve correspond to the images one-to-one. Humans can perform fine-tuning interventions for better analysis of material brittleness and toughness.

Specifically, in this embodiment, the impact speed is 2.9-3.8m/s, the elevation angle of the impact piece 3 is 150°, the impact energy is 1J-22.5J, and the distance between the center of the impact piece 3 and the impact point is 230mm or 395mm; The accuracy of the first detection part 4 and the second detection part are both 0.1%, and the models of the first acquisition part 51, the second acquisition part 52 and the third acquisition part 53 of the image acquisition component 5 are 4FIBER Camera produced by MIKROTRON GmbH, Its shooting speed is 3000 frames/s and the resolution is 896×328.

As shown in Figures 5-7, a specific implementation process and conclusion of the impact force testing method according to the present embodiment are as follows:

Figures 5(b) and 5(c) show the impact failure modes of bamboo bundle veneer laminate (IBLVL) and reconstituted bamboo (RB), respectively. Under impact load, IBLVL exhibits a typical tensile failure mode after lamination shearing, and the crack propagates through the layer in a "Z" shape. The main rupture mode of RB is multi-layer shear rupture, and its cracks also show obvious delamination propagation.

Figure 5(d) shows the fracture energy-time curves of the two, both of which show the linear elastic and elastoplastic deformation behaviors before reaching the maximum fracture energy. The impact rupture time of IBLVL is 10.85ms, which is 71.7% longer than that of RB (6.32ms), indicating that IBLVL has more impact duration and more energy absorption than RB. The fracture energy and impact toughness of IBLVL are 90.5J and 13.8 (J/cm2), respectively, which are 109% and 127% higher than RB (6.07J/cm2), respectively, as shown in Figures 5(e) and 5(f).

Figures 6 and 7 show the typical dynamic deformation and failure processes of IBLVL and RB under dynamic impact (impact velocity 2.9 m/s), respectively. The whole deformation process can be divided into three typical stages: 1) The bending load formed by the local impact in the center of one end is transferred to the other end; 2) The material begins to deform as a whole under the impact/bending; 3) The buffer failure of the specimen fails.

1) At 0ms, the punch of the impact piece 3 is just in contact with the sample. At 1.32ms, both of them have different degrees of ring damage, and small cracks and wedge-shaped gaps are sporadic initiation and expansion at the outermost end of the impact tension side of the IBLVL and RB specimens, respectively. 2) At 2.64ms, the deformation of the two materials continued to increase, and the cracks expanded to the core layer. IBLVL had fiber pull-out and layered "coupling" fractures; while the outermost main crack of RB had expanded significantly to the middle layer, and there were many The fracture voids appear and enter the unstable expansion stage, which will cause irreversible damage to the material. 3) At 3.96ms, the deformation of IBLVL continued to increase, and the phenomenon of small cracks converging into Z-shaped main cracks was obvious; at this time, RB had reached the maximum damage deformation, and a large number of fibers were broken. 4) At 5.28ms, the IBLVL reaches the maximum deformation amount, and the front section of the crack has reached the 2/3 width section of the sample; at this time, the RB shows the rebound phenomenon of the sample. 5) At 6.27ms, the impact piece 3 of the RB sample rebounded and separated from the sample, the impact was completed, and the IBLVL was still in the rebound state of the sample; 6) At 10.56ms, the impact piece 3 of the IBLVL was separated from the sample, the impact was completed, and the IBLVL and RB, the durations of the entire impulse response phase are 10.56ms and 6.27ms, respectively.

In conclusion, compared with RB, IBLVL has better impact toughness, which depends on the synergy between the upper and lower layers and the core layer in the process of impact resistance and energy absorption.

In the description of this specification, description with reference to the terms "some embodiments," "other embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention or in the example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above contents are only preferred embodiments of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. limits.

Claims (10)

1. an impact force testing device, is characterized in that, comprises: rack(1); an installation assembly (2), the installation assembly (2) is arranged on the rack (1), and the installation assembly (2) is used for installing the sample; an impact piece (3), the impact piece (3) is rotatably provided on the frame (1); A first detection piece (4), the first detection piece (4) is provided on the impact piece (3), and the first detection piece (4) is used to obtain the impact of the impact piece (3) on the impact piece (3). the force on the specimen; a second detection piece, the second detection piece is connected to the impact piece (3), and the second detection piece is used to acquire the rotational speed of the impact piece (3); An image acquisition assembly (5) is provided on the rack (1), and the image acquisition assembly (5) can simultaneously acquire image information of the sample. 2 . The impact force testing device according to claim 1 , wherein the first side of the impact piece ( 3 ) is disposed toward the mounting assembly ( 2 ), and the second side of the impact piece ( 3 ) is disposed. 3 . Disposed away from the mounting assembly (2), the first detection piece (4) is arranged on the second side of the impact piece (3). 3. The impact force testing device according to claim 1, wherein the mounting assembly (2) comprises two mounting parts (21) arranged at intervals, and the two mounting parts (21) are respectively provided with A plurality of mounting parts (22) are provided on the two mounting parts (21) in a one-to-one correspondence respectively. 4. The impact force testing device according to claim 3, wherein the mounting member (21) comprises a mounting bracket (211) and a locking member (212), and the mounting portion (22) is along two The distribution direction of the mounting member (21) is movably provided on the mounting frame (211), and the locking member (212) is used for locking the mounting portion (22) on the mounting frame (211). )superior. 5. The impact force testing device according to claim 1, characterized in that the first side of the sample is arranged toward the impact member (3), and the second side of the sample is away from the impact member (3). 3) Setting; The image acquisition component (5) includes: a first collecting part (51), the first collecting part (51) is arranged on the frame (1) and is used for acquiring image information of the first side of the sample; a second collection member (52), the second collection member (52) is arranged on the frame (1) and used for acquiring image information of the second side of the sample; A third collection member (53), the third collection member (53) is provided on the rack (1) and can acquire image information of the bottom side of the sample. 6 . The impact force testing device according to claim 5 , wherein the image acquisition assembly ( 5 ) further comprises a reflector ( 54 ), and the reflector ( 54 ) is arranged on the frame ( 1 ). 7 . On and below the sample, the reflector (54) can reflect the image information of the bottom side of the sample to the third collection member (53). 7 . The impact force testing device according to claim 1 , wherein the impact force testing device further comprises a supplementary light component, and the supplementary light component is used for irradiating light to the sample. 8 . 8. The impact force testing device according to claim 1, wherein the frame (1) comprises: a body (11), the body (11) defines an accommodating cavity, and the impact piece (3) and the mounting assembly (2) are both disposed in the accommodating cavity; A protective door (12) is movably provided at the open end of the accommodating cavity. 9. The impact force testing device according to claim 1, wherein the impact member (3) comprises: a driving member (31), the driving member (31) is arranged on the frame (1); A swinging rod (32), one end of the swinging rod (32) is connected to the output end of the driving member (31), and the driving member (31) can drive the swinging rod (32) to rotate and make the swinging The angle between the rod (32) and the horizontal direction is kept fixed; an impact blade (33), the impact blade (33) is connected to the other end of the swing rod (32); A solenoid valve (34), the solenoid valve (34) is used to control the driving member (31) to release the swing rod (32), so that the swing rod (32) drives the impact blade (33) to impact the said sample. 10. An impact force testing method, characterized in that, based on the impact force testing device according to any one of claims 1-9, comprising: The first detection part (4), the second detection part and the image acquisition component (5) respectively acquire working signals and start to acquire the force, rotational speed and image information respectively; The impact piece (3) acquires the working signal and rotates the impact sample; Obtain the relationship curve of impact energy and time received by the impact piece (3); The first detection element (4), the second detection element and the image acquisition component (5) respectively stop acquiring the force, rotational speed and image information after a preset time.

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