CN108871980B - Dynamic double-shear test device - Google Patents
Dynamic double-shear test device Download PDFInfo
- Publication number
- CN108871980B CN108871980B CN201810880232.9A CN201810880232A CN108871980B CN 108871980 B CN108871980 B CN 108871980B CN 201810880232 A CN201810880232 A CN 201810880232A CN 108871980 B CN108871980 B CN 108871980B
- Authority
- CN
- China
- Prior art keywords
- double
- shear
- rod
- sample
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a dynamic double-shear test device, which comprises: an incident rod, a transmission tube and a double-shearing sample; the double-shear sample is arranged between the incident rod and the transmission tube, and after the incident rod is impacted, the incident rod generates stress waves and loads the double-shear sample; the double shear sample generates a longitudinal shear force at the shear plane and transmits a stress wave of the longitudinal shear force to the transmission tube during loading. The method and the device can test the longitudinal shear strength of the fiber/matrix interface under the impact load.
Description
Technical Field
The invention relates to the technical field of material mechanics test, in particular to a dynamic double-shear test device.
Background
In the field of national defense and industrial production, structural members of different materials are often subjected to impact loads, such as bird strikes of aircraft, hail strikes and space debris strikes of spacecraft, while in relation to our lives, collision avoidance of automobiles, and crash resistance of mobile phones, etc.
Therefore, it is often necessary to perform an impact loading test on a test material, such as a typical dynamic loading of a hopkinson rod, to obtain a real mechanical response of the material at different loading rates, so as to guide the setting of material parameters in finite element simulation, wherein the hopkinson rod is proposed by a hopkinson father and is continuously developed by a later person on the basis of the proposition. The method is characterized in that a test material is placed between two rods, an acceleration pulse is generated through accelerated mass quick impact or explosive explosion, the acceleration pulse is transmitted in the incident rod in the form of stress waves, when the stress waves are transmitted to a sample between the two rods, the sample can be loaded, the sample can transmit a part of the stress waves to a transmission rod, meanwhile, the stress waves in the incident rod and the transmission rod are recorded through strain gauges attached to the incident rod and the transmission rod and at a certain distance from the end parts of the rods, if the incident rod and the transmission rod are kept in an elastic state, the stress waves in the rods are transmitted at an elastic wave speed without distortion, and therefore the strain gauges can measure the time-varying history of the load acting on the ends of the rods.
At present, the dynamic shear test of the material mainly comprises a single shear test method and a double shear test method, wherein the single shear test method is easy to generate bending moment on a shear surface instead of a pure shear state due to the loading state of the single shear test method, or the test failure is caused because a fracture surface is not a shear surface. The double shearing method is mainly applied to cap-shaped samples at present, but the processing is difficult and the method is mainly applied to metal materials. At present, a standard experiment method does not exist in a test experiment under a dynamic load of longitudinal shear strength of a fiber/matrix interface, the existing experiment method comprises microscopical mechanical experiments such as single fiber extraction, single fiber extrusion and single fiber breakage and a single shear practical experiment based on ASTM5379, the microscopical mechanical experiments are difficult to operate and need to be corrected in a later period, the data dispersibility is large, and the single shear practical experiment based on ASTM5379 is difficult to realize dynamic loading. Based on this, an effective dynamic double-shearing experimental technology is urgently needed to be provided on the basis of finite element simulation verification.
Disclosure of Invention
The main objective of the present invention is to provide a dynamic double shear test apparatus to solve the above problems in the prior art, wherein:
according to an embodiment of the present invention, a dynamic double shear test apparatus is provided, which includes: an incident rod, a transmission tube and a double-shearing sample;
the double-shear sample is arranged between the incident rod and the transmission tube, and after the incident rod is impacted, the incident rod generates stress waves and loads the double-shear sample;
the double shear sample generates a longitudinal shear force at the shear plane and transmits a stress wave of the longitudinal shear force to the transmission tube during loading.
Wherein, still include: an entrance rod joint and a transmission tube joint arranged between the entrance rod and the transmission tube;
the incident rod joint is used for clamping the double-shearing sample, and the double-shearing sample clamped by the incident rod joint is clamped in the transmission pipe joint;
after the incident rod is impacted, stress waves generated by the incident rod are transmitted to the incident rod joint, so that the double-shear sample is loaded;
the double-shear sample generates longitudinal shear force at a shear surface in the loading process and transmits stress waves of the longitudinal shear force to the transmission pipe joint;
the transmission pipe joint transmits stress waves to the transmission pipe;
wherein the double shear sample comprises: the clamping device comprises a clamping part and two supporting parts positioned on two sides of the clamping part; the clamping part is approximately square, and four corners of the clamping part are chamfered at 45 degrees; the two supporting parts are respectively connected with the clamping part, and a 45-degree gap is formed in a connecting area of the two supporting parts and the clamping part.
The cross-sectional area of the contact surface of the incident rod and the contact surface of the incident rod joint are the same.
The transmission pipe joint is connected with the transmission pipe through fine threads.
Wherein, still include: a striker rod that strikes the entrance rod after being driven.
The incident rod is made of a titanium rod, and the transmission tube is made of an aluminum tube.
The double-shear test sample is formed by paving a unidirectional fiber bundle in a silicon rubber mold and pouring resin for curing.
According to the technical scheme of the invention, the stress of each area on the shearing surface of the double-shearing sample can be ensured to be uniform, and the longitudinal shear strength of the fiber/matrix interface can be tested under the impact load by establishing a finite element model of the dynamic double-shearing device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an overall structure for performing dynamic double shearing according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a double shear sample according to an embodiment of the present invention;
FIG. 3 is a schematic view of an incident rod union according to an embodiment of the present invention;
FIG. 4 is a schematic view of a transmissive tube joint according to an embodiment of the present invention;
FIG. 5 is a schematic view of a dynamic double shear integral joint assembly according to an embodiment of the present invention.
[ notation ] to show
1 high-pressure air chamber
2 transmitting device
3 gun barrel
4 impact rod
5 incident rod
6 incident rod joint
7 double shear test specimen
8 transmission pipe joint
9 transmission tube
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
According to the embodiment of the invention, a dynamic double-shear test device is provided, which is used for testing the longitudinal shear strength of a fiber/matrix interface under an impact load.
Referring to fig. 1, a dynamic double shear test apparatus according to an embodiment of the present invention includes: the device comprises a high-pressure air chamber 1, a launching device 2, a gun barrel 3, a striking rod 4, an incident rod 5, an incident rod joint 6, a double-shear sample 7, a transmission pipe joint 8 and a transmission pipe 9. In the embodiment of the invention, the double shearing device is correspondingly improved on the basis of the traditional Hopkinson pressure bar (SHPB).
FIG. 2 is a schematic illustration of a double sheared sample according to an embodiment of the present invention. Referring to fig. 2, the double shear coupon 7 comprises: a holding end 71 and two support ends 72. Wherein, the two supporting ends 72 have the same size and shape, and the two supporting ends 72 are respectively located at two sides of the holding end 71. As shown, the double shear test piece 7 may be visually referred to as having a "candy-like" shape. In an embodiment, the thickness of the double shear specimen 7 may be 6 mm. The clamping end 71 is a cube, four corners of the clamping end 71 are 45-degree chamfers, 2mm and 45-degree notches are reserved in the area where the two supporting ends 72 are connected with the clamping end 71, and the design of the notches can ensure that stress of each area on the shearing surface of the sample is uniform.
As can be seen from FIG. 2, the shaded area of the double-shearing sample is a fiber bundle, the axial direction of the fiber is shown as the drawing shading, and the unidirectional fiber bundle is laid in the gap of the silicon rubber mold and is poured with resin for curing and molding.
Fig. 3 is a schematic view of an incident rod union 6 for holding the double shear specimen 7 according to an embodiment of the present invention. Referring to fig. 3, the entrance rod adapter 6 is clamped to the clamping end 71 of the double shear specimen 7.
Fig. 4 is a schematic diagram of a transmissive tube joint according to an embodiment of the present invention, and referring to fig. 4, a transmissive tube joint 8 includes a cylindrical base and 4 protrusions provided on the base, and the double shear sample 7 held by the incident rod joint 6 is captured in the transmissive tube joint 8.
Fig. 5 is a schematic diagram of a dynamic double shear integral joint assembly according to an embodiment of the present invention, and referring to fig. 5, the two support ends 72 of the double shear test piece 7 are snapped into the protrusions of the transmissive tube joint 8. In an embodiment, a gap of 0.2mm may be reserved between the two supporting ends 72 of the double-shear sample 7 and the transmission tube joint 8, and a gap of 0.2mm may be reserved between the incident rod joint 6 and the incident rod 5.
During the experiment, high-pressure nitrogen is filled in the high-pressure air chamber 1, after the launching device 2 releases the high-pressure nitrogen, the impact rod 4 in the acceleration gun barrel 3 impacts the incident rod 5 to generate stress waves, and the stress waves can be completely transmitted to the double-shear sample 7 for loading due to the fact that the materials and the sectional areas of the contact surfaces of the incident rod 5 and the incident rod joint 6 are the same. The double shear sample 7 transmits a stress wave to the transmissive tube junction 8 during loading by interfacial longitudinal shear forces in the longitudinal direction of the fiber generated at the shear plane of the double shear sample 7.
The transmission pipe joint 8 can be made of an aluminum pipe with an inner diameter 16 and an outer diameter 30, the transmission pipe joint 8 is connected with the transmission pipe 9 through fine threads, and a concave surface in the transmission pipe joint 8 is in contact with the end surface of the transmission pipe 9. Thereby, the stress wave energy on the transmissive tube joint 8 is efficiently propagated into the transmissive tube 9 without excessive loss. Finally, strain signals are converted into voltage signals through strain gauges on the incident rod 5 and the transmission tube 9 by using an 1/2 electric bridge, and the voltage signals are collected by a data collection system, wherein the collection frequency is 10 MHz. Finite element simulation and experiments in the whole experimental process verify that the double-shearing test sample is in a stress balance state in the experimental process, and the error between the longitudinal shearing stress of a real interface and the strength measured by the experiment is within 10%.
Compared with the existing experimental device, the experimental device has the following advantages:
1. the stress state on the shearing surface is a pure shearing stress state;
2. the final failure mode of the sample is broken along a preset shearing surface, and the failure mode is easily ensured;
3. the failure of the base material can be effectively avoided under the condition that the strength difference of the interface strength is not large compared with that of the base material;
4. the experimental device is simple to operate, the joint can be replaced, the experiment is accurate and efficient, and the error is small.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (5)
1. A dynamic double shear test device, comprising: an incident rod, a transmission tube and a double-shearing sample;
the double shear test piece comprises: the clamping device comprises a clamping part and two supporting parts positioned on two sides of the clamping part; the clamping part is approximately square, and four corners of the clamping part are chamfered at 45 degrees; the two supporting parts are respectively connected with the clamping part, and a 45-degree gap is formed in a connecting area of the two supporting parts and the clamping part; the double-shearing sample is formed by paving a unidirectional fiber bundle in a silicon rubber mold and pouring resin for curing;
the double-shear sample is arranged between the incident rod and the transmission tube, and after the incident rod is impacted, the incident rod generates stress waves and loads the double-shear sample;
the double-shear sample generates a longitudinal shear force at a shear surface in a loaded process and transmits a stress wave of the longitudinal shear force to the transmission tube;
the dynamic double shear test device further comprises: an entrance rod joint and a transmission tube joint arranged between the entrance rod and the transmission tube;
the incident rod joint is used for clamping the double-shearing sample, the incident rod joint is clamped on the clamping part of the double-shearing sample, the transmission pipe joint comprises a cylindrical base and 4 bulges arranged on the base, and two support parts of the double-shearing sample are clamped in the bulges of the transmission pipe joint;
after the incident rod is impacted, stress waves generated by the incident rod are transmitted to the incident rod joint, so that the double-shear sample is loaded;
the double-shear sample generates longitudinal shear force at a shear surface in the loading process and transmits stress waves of the longitudinal shear force to the transmission pipe joint; the transmissive tube joint transmits stress waves to the transmissive tube.
2. The device of claim 1, wherein the cross-sectional area of the contact surface of the input rod and the input rod connector is the same.
3. The device of claim 1, wherein the connector of the transmission tube is coupled to the transmission tube with a fine thread.
4. The apparatus of claim 1, further comprising: a striker rod that strikes the entrance rod after being driven.
5. The device of claim 1, wherein the entrance rod is made of a titanium rod and the transmission tube is made of an aluminum tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880232.9A CN108871980B (en) | 2018-08-03 | 2018-08-03 | Dynamic double-shear test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880232.9A CN108871980B (en) | 2018-08-03 | 2018-08-03 | Dynamic double-shear test device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108871980A CN108871980A (en) | 2018-11-23 |
| CN108871980B true CN108871980B (en) | 2021-06-25 |
Family
ID=64307718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810880232.9A Active CN108871980B (en) | 2018-08-03 | 2018-08-03 | Dynamic double-shear test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108871980B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122355A (en) * | 2020-01-13 | 2020-05-08 | 济南大学 | Dynamic impact shearing device and method for realizing ultrahigh controllable strain rate |
| CN113504131B (en) * | 2021-07-09 | 2022-06-14 | 中国矿业大学 | Test system and test method for testing II-type dynamic fracture toughness of rock under different normal stresses |
| CN114459924B (en) * | 2022-01-19 | 2024-02-13 | 武汉理工大学 | Functional part and test device for testing performance of automobile anti-collision material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203643279U (en) * | 2013-12-09 | 2014-06-11 | 北京有色金属研究总院 | Device for measuring dynamic shearing property of material |
| CN104048883A (en) * | 2014-03-03 | 2014-09-17 | 四川大学 | Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof |
| US20160178496A1 (en) * | 2014-12-22 | 2016-06-23 | Rolls-Royce Plc | Output member |
| CN107796711A (en) * | 2017-09-20 | 2018-03-13 | 天津大学 | A kind of method for testing complete sample and structural plane dynamic shear strength |
| CN108204918A (en) * | 2018-02-01 | 2018-06-26 | 东南大学 | A kind of composite material dynamic shear test method |
| CN108254264A (en) * | 2017-12-25 | 2018-07-06 | 北京有色金属研究总院 | A kind of metal material dynamic shearing deformation and the standard experimental method in situ of failure behaviour |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6431009B2 (en) * | 1999-01-08 | 2002-08-13 | Fred I. Grace | Dynamic shear test sample and method |
| CN105784505B (en) * | 2016-03-04 | 2018-08-07 | 中国科学院武汉岩土力学研究所 | II type fracture toughness test method |
-
2018
- 2018-08-03 CN CN201810880232.9A patent/CN108871980B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203643279U (en) * | 2013-12-09 | 2014-06-11 | 北京有色金属研究总院 | Device for measuring dynamic shearing property of material |
| CN104048883A (en) * | 2014-03-03 | 2014-09-17 | 四川大学 | Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof |
| US20160178496A1 (en) * | 2014-12-22 | 2016-06-23 | Rolls-Royce Plc | Output member |
| CN107796711A (en) * | 2017-09-20 | 2018-03-13 | 天津大学 | A kind of method for testing complete sample and structural plane dynamic shear strength |
| CN108254264A (en) * | 2017-12-25 | 2018-07-06 | 北京有色金属研究总院 | A kind of metal material dynamic shearing deformation and the standard experimental method in situ of failure behaviour |
| CN108204918A (en) * | 2018-02-01 | 2018-06-26 | 东南大学 | A kind of composite material dynamic shear test method |
Non-Patent Citations (3)
| Title |
|---|
| TC4在动态载荷下的剪切行为研究;苏冠龙 等;《***与冲击》;20150731;第35卷(第4期);527-535 * |
| 双剪切试样用于短纤维金属基复合材料的蠕变响应研究;岳珠峰 等;《金属学报》;20030131;第39卷(第1期);104-108 * |
| 金属材料剪切力学性能及测试方法研究;丁晓燕;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20161215;4-9，17，18页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108871980A (en) | 2018-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108871980B (en) | Dynamic double-shear test device | |
| CN104913985B (en) | Concrete impact based on nonequilibrium condition is curved to draw the measure device and assay method damaged | |
| CN104048883B (en) | The method of testing brittle material dynamic shearing fracture toughness and enforcement device thereof | |
| CN108195679B (en) | Device for measuring tensile strength of wire rod micro sample and test method | |
| CN105259039A (en) | Micro-force testing system based on cantilever beam and testing method of micro-force testing system | |
| CN101482472A (en) | One-dimensional lamination crack tension test method based on Hopkinson principle | |
| GB2587397A (en) | Split-Hopkinson pressure bar device | |
| CN101236152B (en) | Bullet impact method for testing coating/ thin film basal body interface bond strength | |
| CN115901501A (en) | Dynamic torsion-stretching/compressing synchronous combined loading device and loading method | |
| CN209945901U (en) | Test device for double-sided shearing of concrete material by Hopkinson bar | |
| CN211122349U (en) | Hopkinson pull rod device with dynamic and static combination loading in high-temperature environment | |
| CN111579404A (en) | Dynamic uniaxial bidirectional compression experimental method for brittle material | |
| CN111307567A (en) | Testing assembly and testing method for dynamic tension-shear mechanical parameters of brittle material | |
| CN214408804U (en) | Ultrasonic excitation acquisition device for concrete micro-crack detection | |
| CN116337591B (en) | Separated Hopkinson pressure bar experimental device suitable for complex stress state of material | |
| CN107884271B (en) | Impact-pulling converter for rock dynamic direct tensile test and impact-pulling test method | |
| CN207633216U (en) | A kind of intelligent strand tapered anchorage based on Piezoelectric Impedance method | |
| CN205138897U (en) | Test system of doing all can a little based on cantilever beam | |
| CN106596257A (en) | Anchorage device, clamp and connector static load anchoring test total strain measurement apparatus and method thereof | |
| CN114199705A (en) | Device and method for dynamic shear test of coal rock material | |
| CN113237775A (en) | Device for testing dynamic tensile mechanical properties of fiber monofilaments at high temperature | |
| Sharma et al. | Evaluation of material properties of SA 516, Gr. 70 using Split Hopkinson Bar technique under tensile and compressive high strain-rate loading | |
| CN109738271B (en) | Analysis method for dynamic failure load of rivet connection area | |
| CN110161116B (en) | Displacement and acoustic emission integrated sensing device | |
| KR20160082354A (en) | Impact test system using energy frame with improved strain rate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |