CN114397205A - Impact force testing device and method - Google Patents
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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
Technical Field
The invention relates to the technical field of impact testing, in particular to an impact force testing device and method.
Background
The digital display cantilever beam and the simple support beam are mainly used for measuring the impact toughness of nonmetal materials such as rigid thermoplastic molding and extrusion molding materials, rigid thermosetting molding materials, fiber reinforced thermosetting and thermoplastic composite materials and the like. The impact pendulum comprises a machine body, an impact pendulum, a sample support, a measuring device, an operating mechanism and the like.
The disadvantages of this technique are: the existing instrument is generally suitable for representing the impact behavior only by using the impact strength, and only obtaining the impact strength or the impact fracture energy; and the potential energy of the impact tester is required to be approximately matched with the fracture energy of the sample to be tested. Finally, only one result value representing the fracture toughness of the material can be obtained through manual table lookup or digital display, and key information parameters such as load-deflection, impact energy-time and the like in the whole process cannot be obtained, so that key data and information loss of the material in the in-situ acquisition process such as stress-strain, deflection-load and the like in the contact load-elastic deformation-plastic damage-complete fracture process are caused. The traditional impact test fracture method cannot acquire important change information such as microcrack germination, crack extension, delamination and penetration, fiber fracture, matrix compression deformation, interface debonding and slipping and the like in the impact process at high precision, and cannot perform comprehensive, objective and deep analysis and research on the failure mechanism of the material on a microscopic image and a dynamic video.
Therefore, an impact testing apparatus and method are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide an impact force testing device and method, which can improve the acquisition parameter range of the impact force test on a sample and facilitate the comprehensive, objective and deep analysis and research on the failure mechanism of the sample.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
an impact force testing device comprising: a frame; the mounting assembly is arranged on the rack and used for mounting a sample; the impact piece is rotatably arranged on the rack; 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 used for acquiring the rotating speed of the impact piece; the image acquisition assembly is arranged on the rack and can acquire the image information of the sample simultaneously.
Furthermore, the first side of the impact piece faces the installation assembly, the second side of the impact piece deviates from the installation assembly, and the first detection piece is arranged on the second side of the impact piece.
Further, the installation component comprises two installation parts arranged at intervals, wherein the installation parts are respectively provided with a plurality of installation parts and a plurality of installation parts on the installation parts, and the installation parts are respectively arranged in a one-to-one correspondence mode.
Further, the installed part includes mounting bracket and retaining member, the installation department is followed two the distribution direction movably of installed part is established on the mounting bracket, the retaining member is used for with the installation department locking is in on the mounting bracket.
Further, a first side of the test specimen is disposed toward the impact member and a second side of the test specimen is disposed away from the impact member; the image acquisition assembly comprises: the first acquisition part is arranged on the rack and is used for acquiring image information of a first side of the sample; the second acquisition part is arranged on the rack and is used for acquiring image information of a second side of the sample; and the third acquisition 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 comprises a reflecting member, the reflecting member is arranged on the rack and located below the sample, and the reflecting member can reflect the image information of the bottom side of the sample to the third acquisition member.
Furthermore, the impact force testing device further comprises a light supplement assembly, and the light supplement assembly is used for irradiating light rays to the sample.
Further, the rack includes: a body defining a receiving cavity, the impact member and the mounting assembly both being disposed within the receiving cavity; the protection door is movably arranged at the open end of the accommodating cavity.
Further, the impact member includes: the driving piece is arranged on the rack; one end of the swinging rod is connected to the output end of the driving piece, and the driving piece can drive the swinging rod to rotate and enable the included angle between the swinging rod and the horizontal direction to be kept fixed; an impact blade connected to the other end of the swing lever; and the electromagnetic valve is used for controlling the driving piece to release the swinging rod so that the swinging rod drives the impact blade to impact the sample.
An impact force testing method based on the impact force testing device comprises the following steps: the first detection piece, the second detection piece and the image acquisition assembly respectively acquire working signals and respectively start to acquire acting force, rotating speed and image information; the impact piece acquires a working signal and rotates to impact the sample; acquiring a relation curve of impact energy borne by an impact piece and time; the first detection piece, the second detection piece and the image acquisition assembly respectively stop acquiring acting force, rotating speed and image information after preset time.
The invention has the beneficial effects that:
the mounting assembly can stably and reliably bear the sample, so that the impact piece can keep the position unchanged when impacting the sample, and reliable information of the sample can be conveniently acquired by the first detection piece, the second detection piece and the image acquisition assembly. The first detection piece can acquire the effort that the impact piece applyed on the sample, and the second detection piece can acquire the rotational speed of impact piece, and the image information that the image acquisition subassembly can acquire the different position of sample simultaneously. Therefore, in the whole impact process, the changes of parameters such as deflection, force value, stress, strain and the like of the sample can be calculated more reliably through the acting force and the rotating speed recorded by the first detection piece and the second detection piece and the parameters of the impact piece and the sample, so that the deflection-force value, stress-strain or force-time curve in the whole impact process is recorded; meanwhile, the image acquisition assembly can obtain a picture of deformation or fracture morphology of the sample in the whole impact process, and can obtain fracture characteristics of each side face of the sample when the sample is impacted, such as important change information of microcrack germination, crack extension, delamination and penetration, fiber snapping, matrix compression deformation, interface debonding and sliding and the like, and fracture characteristics of lateral impact, penetration impact, vertical direction and parallel impact. Therefore, the fracture mode and the fracture characteristics of the sample can be analyzed more objectively and comprehensively by the change of the obtained impact deflection-load curve and the synchronous fracture morphology characteristics acquired by the image acquisition assembly, such as rapid judgment of ductile fracture, brittle fracture and brittle fracture.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of an impact force testing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partially exploded structure of an impact force testing device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a portion of a rack according to an embodiment of the present invention;
FIG. 4 is a partial schematic structural view of a mounting assembly provided in accordance with an embodiment of the present invention;
FIG. 5 is a graph showing the results of an impact force test method according to an embodiment of the present invention;
FIG. 6 is a second graph showing the test results of the impact force testing method according to the embodiment of the present invention;
fig. 7 is a third test result diagram of the impact force testing method according to the embodiment of the present invention.
Reference numerals
1. A frame; 11. a body; 12. a protective door; 13. a column; 14. collecting a support piece; 15. a support leg; 2. mounting the component; 21. a mounting member; 211. a mounting frame; 212. a locking member; 22. an installation part; 221. mounting grooves; 3. an impact member; 31. a drive member; 32. a swing lever; 33. an impact blade; 34. an electromagnetic valve; 4. a first detecting member; 5. an image acquisition component; 51. a first collecting member; 52. a second collecting member; 53. a third collecting member; 54. a reflector; 6. and a light supplement lamp.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a 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 4.
As shown in fig. 1-4, fig. 1 discloses an impact force testing device, which includes a frame 1, a mounting assembly 2, an impact member 3, a first detecting member 4, a second detecting member, and an image capturing assembly 5. The mounting component 2 is arranged on the machine frame 1, and the mounting component 2 is used for mounting a sample. The impact member 3 is rotatably provided on the frame 1. The first detecting part 4 is arranged on the impact piece 3, and the first detecting part 4 is used for acquiring the acting force applied to the test sample by the impact piece 3. The second detection piece is connected with the impact piece 3, and the second detection piece is used for acquiring the rotating speed of the impact piece 3. The image acquisition assembly 5 is arranged on the machine frame 1, and the image acquisition assembly 5 can simultaneously acquire the image information of the sample.
It will be appreciated that the mounting assembly 2 can stably and reliably carry the test sample, so that the impact member 3 can maintain a constant position when impacting the test sample, so as to facilitate reliable information acquisition of the test sample by the first detection member 4, the second detection member and the image acquisition assembly 5. The first detection piece 4 can acquire the acting force applied to the sample by the impact piece 3, the second detection piece can acquire the rotating speed of the impact piece 3, and the image acquisition assembly 5 can acquire image information of different directions of the sample at the same time. Therefore, in the whole impact process, the changes of parameters such as deflection, force value, stress, strain and the like of the sample can be calculated more reliably through the acting force and the rotating speed recorded by the first detection piece 4 and the second detection piece and the parameters of the impact piece 3 and the sample, so that the deflection-force value, stress-strain or force-time curve in the whole impact process can be recorded; meanwhile, the image acquisition assembly 5 can obtain a picture of deformation or fracture morphology of the sample in the whole impact process, and can obtain fracture characteristics of each side face of the sample when the sample is impacted, such as important change information of microcrack germination, crack extension, delamination and penetration, fiber snapping, matrix compression deformation, interface debonding and sliding and the like, and fracture characteristics of lateral impact, penetration impact, vertical direction and parallel impact. Therefore, the fracture mode and the fracture characteristics of the sample can be analyzed more objectively and comprehensively by the change of the obtained impact deflection-load curve and the synchronous fracture morphology characteristics acquired by the image acquisition assembly 5, such as rapid judgment of ductile fracture, brittle fracture and brittle fracture.
According to the impact force testing device of the embodiment, the collection parameter range of the impact force test on the sample can be better enlarged, the important change information of each impact surface of the sample is obtained on the microscopic image and the dynamic video, and the comprehensive, objective and deep analysis and research on the failure mechanism of the sample are conveniently realized.
In some embodiments, as shown in fig. 1, a first side of the impact member 3 is disposed toward the mounting assembly 2, a second side of the impact member 3 is disposed away from the mounting assembly 2, and the first sensing member 4 is disposed on the second side of the impact member 3.
It can be understood that, if the first detecting element 4 is disposed on the first side of the impact element 3, when the impact element 3 impacts the sample, although the first detecting element 4 can obtain the impact force applied to the sample, at the same time, the first detecting element 4 may be damaged, and the error of the obtained impact force is also large. In this embodiment, set up in the first detection piece 4 of second side can acquire the impact force that the impact force was used to the sample through the reaction force of impact piece 3 to can guarantee the accuracy that first detection piece 4 detected the impact force, can prevent again that first detection piece 4 from damaging the problem in the testing process.
Specifically, in the present embodiment, the first detection member 4 may be provided as a force sensor.
In some embodiments, as shown in fig. 1 and 2, the mounting assembly 2 includes two mounting members 21 disposed at intervals, a plurality of mounting portions 22 are disposed on each of the two mounting members 21, and the plurality of mounting portions 22 on each of the two mounting members 21 are disposed in a one-to-one correspondence.
It can be understood that both ends of sample can be installed respectively on an installation department 22 on an installed part 21 to realize the firm installation of sample on installation component 2, installation department 22 is equipped with a plurality ofly simultaneously, and a plurality of installation departments 22 can realize the installation of the different positions of sample on installation component 2, with the application scope who improves the test. In addition, because two installation parts 21 are arranged at intervals, the image acquisition assembly 5 can acquire the image information of the sample positioned between the two installation parts 21, and the image information acquisition of the sample is convenient to realize.
Specifically, the plurality of mounting portions 22 on each mounting member 21 are provided at intervals in the vertical direction.
Specifically, as shown in fig. 4, the side of the mounting portion 22 is provided with a mounting groove 221, so as to mount the end portion of the fixed sample, when the impact piece 3 impacts the sample, the upper side and the lower side of the sample and the side departing from the impact piece 3 can be limited by the mounting groove 221, and therefore the sample is prevented from falling off under the impact action.
In some embodiments, as shown in fig. 1 and 2, the mounting members 21 include a mounting frame 211 and a locking member 212, the mounting portions 22 are movably disposed on the mounting frame 211 along the distribution direction of the two mounting members 21, and the locking member 212 is used for locking the mounting portions 22 on the mounting frame 211.
It can be understood that, because the mounting portion 22 can be movably disposed, samples with 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, so as to ensure reliable mounting of the samples when length adjustment is realized.
Specifically, the locker 212 includes a locking wrench, which is screw-coupled to the mounting bracket 211 and the mounting part 22 to perform a locking effect.
In some embodiments, as shown in fig. 1 and 2, a first side of the test specimen is disposed toward the impactor 3 and a second side of the test specimen is disposed away from the impactor 3. The image capturing assembly 5 includes a first capturing member 51, a second capturing member 52, and a third capturing member 53. A first acquisition member 51 is provided on the gantry 1 and is used to acquire image information of a first side of the sample. A second acquisition member 52 is provided on the gantry 1 and is used to acquire image information of the second side of the sample. The third acquisition member 53 is provided on the rack 1 and is capable of acquiring image information of the bottom side of the sample.
It can be understood that through the arrangement of the first collecting element 51, the second collecting element 52 and the third collecting element 53, high-definition video images of deformation of the sample at three typical positions, i.e., the incident surface, the emergent surface and the fracture surface of the impact element 3, can be obtained in real time.
Specifically, in the present embodiment, the first pickup member 51, the second pickup member 52, and the third pickup member 53 can be each provided as a CCD camera, a high-speed camera, or the like.
Specifically, as shown in fig. 1 and 2, the gantry 1 further includes a collecting support 14, and the collecting support 14 is configured to support a first collecting member 51, a second collecting member 52, and a third collecting member 53.
In some embodiments, as shown in fig. 1 and 2, the image capturing assembly 5 further comprises a reflecting member 54, the reflecting member 54 is disposed on the rack 1 and located below the sample, and the reflecting member 54 can reflect the image information of the bottom side of the sample to the third capturing member 53.
It can be understood that, through the arrangement of the reflection member 54, the third collection member 53 can obtain the image information of the bottom side of the sample without being arranged below the sample, so that the occupied space of the third collection member 53 below the sample is effectively reduced, the integration level of the whole device is improved, meanwhile, the problem that the third collection member 53 is accidentally damaged by the impact member 3 can be prevented, and the service life of the device is prolonged.
Specifically, the reflection member 54 includes a high-definition prism capable of achieving 90 ° refraction, for example, a 45 ° prism.
In some embodiments, as shown in fig. 1 and 2, the impact force testing device further includes a light supplement assembly for illuminating light to the sample.
It can be understood that the light supplementing assembly can provide a better image acquisition environment, so that the definition of the image of the sample acquired by the image acquisition assembly 5 is effectively improved, and the data analysis of the sample is facilitated.
Specifically, as shown in fig. 2, the light supplement assembly includes a plurality of light supplement lamps 6, and the plurality of light supplement lamps 6 are annularly disposed around the sample according to the actual requirement of the sample.
In some embodiments, as shown in fig. 1 and 3, the rack 1 includes a body 11 and a guard door 12. The body 11 defines a receiving cavity in which the impact member 3 and the mounting assembly 2 are both disposed. A guard door 12 is movably disposed at the open end of the receiving cavity.
It can be understood that the protective door 12 can provide a reliable protective effect, thereby better ensuring the safety of the impact test.
In particular, the frame 1 further comprises feet 15, the feet 15 being provided on the bottom wall of the body 11.
In some embodiments, as shown in fig. 2, the impact member 3 includes a driving member 31, a swing lever 32, an impact blade 33, and a solenoid valve 34. The driving member 31 is provided 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 driving member 31 to release the swinging rod 32 so that the swinging rod 32 drives the impact blade 33 to impact the sample.
It can be understood that, through the arrangement of the electromagnetic valve 34, the control of the driving member 31 can be better realized, and the driving member 31 can drive the oscillating rod 32 to keep at the preset angle, so that the impact blade 33 can fall under the condition of different angles, and the impact on the sample can be completed.
Specifically, as shown in fig. 1 and 3, the frame 1 further includes a column 13, and the driving member 31 and the solenoid valve 34 are disposed on the column 13.
In some specific embodiments, the second detecting member is a photoelectric encoder. The photoelectric encoder is connected to the driving member 31 to acquire the output rotation speed of the driving member 31, and further, the rotation speeds of the oscillating lever 32 and the impact blade 33.
The invention also discloses an impact force testing method, based on the impact force testing device, comprising: the first detection piece 4, the second detection piece and the image acquisition assembly 5 respectively acquire working signals and respectively start to acquire acting force, rotating speed and image information; the impact piece 3 acquires a working signal and rotates an impact sample; acquiring a relation curve of impact energy received by the impact piece 3 and time; the first detection piece 4, the second detection piece and the image acquisition assembly 5 respectively stop acquiring the acting force, the rotating speed and the image information after preset time.
According to the impact force testing method provided by the embodiment of the invention, due to the adoption of the impact force testing device, the acquisition parameter range of the impact force test on the sample can be better enlarged, the important change information of each impact surface of the sample is acquired on the microscopic image and the dynamic video, and the comprehensive, objective and deep analysis and research on the failure mechanism of the sample can be conveniently realized.
Specifically, the impact force testing method using the impact force testing device described above includes:
and clicking a software start button on a human-computer interaction interface, and sending a signal relay by the software. The relay sends out synchronous working signals, so that the image acquisition assembly 5, the first detection piece 4 and the second detection piece work simultaneously to acquire data. The image acquisition assembly 5 acquires a video image of impact deformation of the sample in real time during impact. The high-speed signal collector starts to collect signals of the first detection piece 4 and the second detection piece. The impact member 3 swings down and impacts the test specimen.
And acquiring impact speed by using a photoelectric encoder and acquiring impact force by using a force sensor. And drawing a curve graph of the output force and the time, calculating the deflection through the secondary integral of a pair of force-time curves of the following formula, and drawing a curve of the output force and the deflection.
In particular, the deflection of the impact member 3 is according to formula one:
calculating, wherein t is the time for calculating the deflection after impact and the unit is second(s); s (t) is the deflection of the sample at t after impact, in meters (m); v is0Is the impact velocity in meters per second (m/s); l isPIs the pendulum length of the impact member 3, in meters (m); mHThe horizontal moment of the impact member 3 in newton meters (N · s); f (t) is the force measured after impact at t in newtons (N); mc is the mass of the energy carrier in kilograms (kg); g is the local gravitational acceleration in meters per second squared (m/s 2).
After the force-deflection curve of the sample is obtained, the force-deflection curve is obtained through a formula II
The consumed capacity reaching a certain deflection can be calculated, and finally the impact energy, W, of the sample is obtained according to the size of the samplejEnergy at a specified deflection in joules (J); sjIs a certain point on the force-deflection curve; s is deflection in meters (m); f is force in newtons (N).
And stopping data acquisition after 1 second.
The application software imports data and video pictures. Because the image acquisition assembly 5, the first detection piece 4 and the second detection piece are all synchronously acquired, the data starting points are consistent, and the curves and the video pictures are all provided with time marks. The software finds the impact initial time point through the curve waveform of the first acquisition member 51, and then automatically matches the impact force curve of the second acquisition member 52 with the impact video image, so that the characteristic points on the curve correspond to the images one to one. The manual work can carry out fine adjustment intervention, so that the brittleness and the toughness of the material can be analyzed better.
Specifically, in the embodiment, the impact speed is 2.9-3.8 m/s, the elevation angle of the impact piece 3 is 150 degrees, the impact energy is 1J-22.5J, and the distance between the center of the impact piece 3 and an impact point is 230mm or 395 mm; the accuracy of the first detecting member 4 and the second detecting member is 0.1%, the model of the first collecting member 51, the second collecting member 52 and the third collecting member 53 of the image collecting assembly 5 is 4FIBER Camera produced by MIKROTRON Gmbh, the shooting speed is 3000 frames/s, and the resolution is 896 x 328.
As shown in fig. 5-7, one specific implementation process and conclusion of the impact force testing method according to the embodiment is as follows:
fig. 5(b),5(c) are impact failure modes of the bamboo bundle laminated veneer lumber composite (IBLVL) and the Reconstituted Bamboo (RB), respectively. Under impact load, IBLVL exhibits a typical tensile failure mode following shear of the laminate, with cracks propagating through the layers in a "zigzag" pattern. While the RB main damage mode is multi-layer shear damage, cracks of the RB main damage mode also show obvious delamination and expansion.
FIG. 5(d) is a plot of energy to break versus time for both curves, both showing linear elastic and elastoplastic deformation behavior before maximum energy to break is reached. The impact fracture time of IBLVL was 10.85ms, which is 71.7% longer than RB (6.32ms), indicating that IBLVL has more impact duration and more energy absorption than RB. The IBLVL fracture energy and impact toughness were 90.5J and 13.8(J/cm2), respectively, which were improved by 109% and 127% over RB (6.07J/cm2), respectively, as shown in FIGS. 5(e) and 5 (f).
FIGS. 6 and 7 show typical dynamic deformation and failure processes for IBLVL and RB, respectively, under dynamic impact (impact velocity 2.9 m/s). The entire deformation process can be divided into three typical phases: 1) the bending load formed by the local impact of the center of one end is transmitted to the other end; 2) the material generates structural integral deformation under the impact/bending action; 3) the test piece fails to buffer failure.
1) At 0ms, the punch of the impact piece 3 just contacts the sample. And when the time is 1.32ms, the two parts are broken to different degrees, and the tiny cracks and the wedge-shaped gaps are respectively initiated and expanded in a scattered manner at the outermost ends of the impact tension sides of the IBLVL and RB samples. 2)2.64ms, the deformation of the two materials is continuously increased, cracks are expanded to the core layer, and the IBLVL is subjected to fiber pulling-out and layered 'lotus broken and silk connection' breaking; and the outermost main crack of RB has obviously expanded to the middle layer, and a plurality of fracture gaps appear, and the material is irreversibly damaged when entering a destabilization type expansion stage. 3) When the time is 3.96ms, the IBLVL deformation continues to increase, and the phenomenon that fine cracks are converged into main cracks in a Z shape is obvious; at this time, RB reaches the maximum failure deformation, and a large number of fibers are broken. 4) At 5.28ms, IBLVL reaches the maximum deformation, and the front section of the crack reaches the width section of the test sample 2/3; at this time, the RB shows the rebound phenomenon of the sample. 5) When the time is 6.27ms, the RB sample impact piece 3 rebounds and breaks away from the sample, the impact is finished, and the IBLVL is still in the sample rebound state; 6) by 10.56ms, the IBLVL impact member 3 is disengaged from the test specimen and the impact is complete, with the duration of the IBLVL and RB entire impact response phases being 10.56ms and 6.27ms, respectively.
In summary, IBLVL has better impact toughness than RB, depending on the synergy of the upper and lower layers and the core layer with each other in resisting impact and absorbing energy.
In the description herein, references to the description of "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above 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 description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. An impact force testing device, comprising:
a frame (1);
the mounting assembly (2), the mounting assembly (2) is arranged on the rack (1), and the mounting assembly (2) is used for mounting a sample;
the impact piece (3), the said impact piece (3) is set up on the said framework (1) rotatably;
the first detection piece (4), the first detection piece (4) is arranged on the impact piece (3), and the first detection piece (4) is used for acquiring the acting force applied to the sample by the impact piece (3);
the second detection piece is connected with the impact piece (3) and is used for acquiring the rotating speed of the impact piece (3);
the image acquisition assembly (5), establish image acquisition assembly (5) on frame (1), image acquisition assembly (5) can acquire simultaneously the image information of sample.
2. The impact testing device according to claim 1, wherein a first side of the impact member (3) is arranged towards the mounting assembly (2), a second side of the impact member (3) is arranged away from the mounting assembly (2), and the first detection member (4) is arranged at the second side of the impact member (3).
3. The impact force testing device according to claim 1, wherein the mounting assembly (2) comprises two mounting members (21) arranged at intervals, a plurality of mounting portions (22) are respectively arranged on the two mounting members (21), and the plurality of mounting portions (22) on the two mounting members (21) are respectively arranged in a one-to-one correspondence manner.
4. The impact force testing device according to claim 3, wherein the mounting member (21) comprises a mounting frame (211) and a locking member (212), the mounting portion (22) is movably arranged on the mounting frame (211) along two distribution directions of the mounting member (21), and the locking member (212) is used for locking the mounting portion (22) on the mounting frame (211).
5. The impact force testing device according to claim 1, wherein a first side of the test specimen is arranged towards the impact member (3) and a second side of the test specimen is arranged away from the impact member (3);
the image acquisition assembly (5) comprises:
a first acquisition member (51), wherein the first acquisition member (51) is arranged on the machine frame (1) and is used for acquiring image information of a first side of the sample;
a second acquisition member (52), wherein the second acquisition member (52) is arranged on the machine frame (1) and is used for acquiring image information of a second side of the sample;
a third acquisition element (53), said third acquisition element (53) being arranged on the machine frame (1) and being able to acquire image information of the underside of the sample.
6. The impact force testing device according to claim 5, wherein the image capturing assembly (5) further comprises a reflecting member (54), the reflecting member (54) being provided on the frame (1) and located below the test specimen, the reflecting member (54) being capable of reflecting image information of a bottom side of the test specimen to the third capturing member (53).
7. The impact force testing device according to claim 1, further comprising a light supplement assembly for illuminating the sample with light.
8. The impact force testing device according to claim 1, wherein the frame (1) comprises:
a body (11), said body (11) defining a housing cavity, said impact member (3) and said mounting assembly (2) both being disposed within said housing cavity;
a protective door (12), wherein the protective door (12) is movably arranged at the open end of the accommodating cavity.
9. The impact force testing device according to claim 1, wherein the impact member (3) comprises:
the driving piece (31), the said driving piece (31) is set up on the said framework (1);
the swing rod (32), one end of the swing rod (32) is connected to the output end of the driving piece (31), and the driving piece (31) can drive the swing rod (32) to rotate and enable the included angle between the swing rod (32) and the horizontal direction to be kept fixed;
an impact blade (33), the impact blade (33) being connected to the other end of the swing lever (32);
the electromagnetic valve (34) is used for controlling the driving piece (31) to release the swinging rod (32) so that the swinging rod (32) drives the impact blade (33) to impact the sample.
10. An impact force testing method, characterized in that the impact force testing apparatus according to any one of claims 1 to 9, comprises:
the first detection piece (4), the second detection piece and the image acquisition assembly (5) respectively acquire working signals and respectively start to acquire acting force, rotating speed and image information;
the impact piece (3) acquires a working signal and rotates to impact the test sample;
acquiring a relation curve of impact energy received by the impact piece (3) and time;
the first detection piece (4), the second detection piece and the image acquisition assembly (5) respectively stop acquiring acting force, rotating speed and image information after preset time.
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| CN118090117A (en) * | 2024-04-17 | 2024-05-28 | 江苏天宇设计研究院有限公司 | Impact test device for protective door |
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| CN114397205B (en) | 2024-07-09 |
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