CN101504347B - Material dynamic double-pressing and shearing experimental device based on Hopkinson rod - Google Patents
Material dynamic double-pressing and shearing experimental device based on Hopkinson rod Download PDFInfo
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- CN101504347B CN101504347B CN2008100175034A CN200810017503A CN101504347B CN 101504347 B CN101504347 B CN 101504347B CN 2008100175034 A CN2008100175034 A CN 2008100175034A CN 200810017503 A CN200810017503 A CN 200810017503A CN 101504347 B CN101504347 B CN 101504347B
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Abstract
The invention relates to a double compression shear experimental device for material dynamics based on a Hopkinson rod. The experimental device comprises a strain foil (5), an impact rod (3), an incident rod (4) and a transmission rod (7); the experimental device is characterized in that one of the adjacent ends of the incident rod (4) and the transmission rod (7) is a V-shaped groove or a wedgy head, while the other end is a wedgy head or a V-shaped groove; included angles between the bevels of the V-shaped groove and the wedgy head and the axes of the incident rod (4) and the transmission rod (7) are the same and between 30 and 80 degrees; and two test samples are symmetrically clamped between the bevels of the V-shaped groove and the wedgy head. The experimental device does not need to make large change to the Hopkinson pressure rod, only needs to reprocess one incident rod (4) of which one end is provided with the wedgy head or the V-shaped groove and a pressure rod of which one end is provided with the V-shaped or the wedgy head and adopts a test sample of the conventional Hopkinson pressure rod to simultaneously apply the impact load combining compression shear on two test samples. The experimental device has the characteristics that equipment has small occupied area, attractive appearance, elegance and simple operation.
Description
One, technical field:
The present invention relates to the dynamic mechanical proving installation of material, is a kind of material dynamic double-pressing and shearing experimental device based on the Hopkinson bar specifically.
Two, background technology:
In actual applications, material mechanical property and destructive process generally all be to be under the complex stress condition, promptly be subjected to normal direction and tangential acting force simultaneously, and tangential force wherein often plays a part to the destruction of material very important.Therefore, the understanding material is cut the research focus that mechanical response feature under the compound loading just becomes association area in pressure.
At present, with regard to dynamic pressure is cut experimental technique, mainly contain three classes at present:
The first kind is the swash plate striking experiment, this technology is carried out the parallel bump of film flying by the gas big gun and is loaded, the shortcoming of this method is that shock Wave is arranged in the experimentation, therefore relates to the response of structure problem, causes being difficult to intuitively obtain stress-strain relationship of material from experiment;
Second class is based on the pressure of Hopkinson torsion bar and turns round loading technique, this technology is to change into pressing on existing Hopkinson torsion bar basis turning round compound loading and realizing pressing and cut loading, but its shortcoming is to press, the shear stress ripple is difficult to arrive simultaneously, and truly dynamic pressure is not cut loading at last;
The 3rd class is to adopt the sample of particular design, as hat or other shape, utilize the Hopkinson depression bar that sample is pressed and cut dynamic load, but the shortcoming of these class methods is to cut compound loading to having realized pressing, but often, be difficult to carry out the experiment test and the analysis of quantification because the transformation of sample makes complex-shaped, the processing difficulties of sample, stress state undesirable.
In recent years, the Lu Fangyun of University of Science and Technology for National Defence etc. transforms traditional Hokinson depression bar again, has proposed a kind of new pressure and has cut the compound loading technology.They are made into the rear end face of the incident bar of Hopkinson depression bar the lozenges of two 45s by original plane, replace original single transmission bar with two transmission bars of installing perpendicular to lozenges, utilized the geometric effect on inclined-plane and end-face friction effect to realize the plane pressure of sample is cut compound loading.But the shortcoming of this method is to need to use two transmission bars, has increased the complicacy and the floor area of system.
Three, summary of the invention
For the complexity, the floor area that overcome the experimental system that exists in the prior art big, and complex-shaped, the processing difficulties of sample, stress state are undesirable, be difficult to carry out the experiment test of quantification and the deficiency of analysis, the present invention proposes a kind of material dynamic double-pressing and shearing experimental device based on the Hopkinson bar.
The technical solution adopted in the present invention is: coaxial order is equipped with drop bar, incident bar and transmission bar on the material dynamic double-pressing and shearing experimental device of Hopkinson bar, accompany two identical samples between incident bar and the transmission bar, data acquisition system (DAS) is by sticking on the foil gauge image data on incident bar and the transmission bar.In the adjacent termination of described incident bar and transmission bar, the termination of incident bar is V-shaped groove or sphenocephaly, the termination of transmission bar is sphenocephaly or V-shaped groove, and promptly the incident bar V-shaped groove cooperates with the sphenocephaly of transmission bar, or the sphenocephaly of incident bar cooperates with the V-shaped groove of transmission bar; The axis angle of the inclined-plane of V-shaped groove and sphenocephaly and incident bar and transmission bar is identical and between 30 ° to 80 °.Between the inclined-plane that is clipped in V-shaped groove and sphenocephaly of two sample symmetries.
In the experimental provision of the present invention, because the incident bar end face adjacent with transmission bar made into the inclined-plane of two symmetries by the plane of traditional Hopkinson depression bar, and the axial angle of the inclined-plane of incident bar and transmission bar abutting end and bar equates, therefore can the inclined-plane that is clipped in two bars with two identical sample symmetries between.During experiment, because the geometric effect on inclined-plane, when the compression stress wave that produces when drop bar bump incident bar arrives incident bar with end face that sample contacts, originally the wave of compression of axially propagating along bar will be decomposed into the wave of compression and the shearing wave that is parallel to the inclined-plane perpendicular to the rod end inclined-plane, wave of compression component wherein will apply compressive load to the sample that is clipped between incident bar and transmission bar inclined-plane, simultaneously under the effect of end-face friction effect, the shearing wave component also is applied on the sample, has realized simultaneously sample being applied compression and shearing impact load.
The present invention need not the Hopkinson depression bar is carried out big change, only need process one one end again and be the depression bar that wedge shape and one one end have V-shaped groove.Adopt traditional Hopkinson depression bar sample to apply simultaneously and press the shock load of cutting combination two samples.Equipment total system floor area is little, and is elegant in appearance, simple to operate.
Four, description of drawings:
Fig. 1 is that incident bar is a V-shaped groove, and rod end and axis angle are the structural representation based on the material dynamic double-pressing and shearing experimental device of Hopkinson bar on 60 ° on inclined-plane;
Fig. 2 is that transmission bar is a V-shaped groove, and rod end and axis angle are the structural representation based on the material dynamic double-pressing and shearing experimental device of Hopkinson bar on 30 ° on inclined-plane;
Fig. 3 is that incident bar is a V-shaped groove, and rod end and axis angle are the structural representation based on the material dynamic double-pressing and shearing experimental device of Hopkinson bar on 80 ° on inclined-plane;
Fig. 4 is that transmission bar is a V-shaped groove, and rod end and axis angle are the structural representation based on the material dynamic double-pressing and shearing experimental device of Hopkinson bar on 45 ° on inclined-plane.
Wherein:
1, high-pressure air source 2, drop bar trigger mechanism 3, drop bar 4, incident bar 5, foil gauge
6, sample 7, transmission bar 8, data acquisition system (DAS)
Wherein:
Five, embodiment:
Embodiment one
As shown in Figure 1: present embodiment comprises drop bar 3, incident bar 4, transmission bar 7, two identical samples 6, drop bar trigger mechanism 2 and high-pressure air source 1.In the present embodiment, the end machining forming V-shape groove that incident bar 4 and transmission bar 7 are adjacent, and the termination of transmission bar with matching 7 is a sphenocephaly, and the axis angle of the inclined-plane of the V-shaped groove of incident bar 4 and transmission bar 7 sphenocephalies and bar is 60 °.Incident bar 4 has an end and the coaxial relative installation of the first end of transmission bar 7 wedge shapes of V-shaped groove, and two samples 6 are clipped in respectively in the middle of two inclined-planes.The other end of incident bar is provided with drop bar 3, drop bar trigger mechanism 2 and high-pressure air source 1.Data acquisition system (DAS) 8 is arranged in addition, and it is by sticking on foil gauge 5 image data on incident bar 4 and the transmission bar 7.
During experiment:
1. adjust the position of incident bar 4 and transmission bar 7, make the V-shaped groove of incident bar 4 relative with the lozenges of transmission bar 7;
2. between the lozenges with the V-shaped groove that is installed in incident bar 4 respectively of two identical sample 6 symmetries and transmission bar 7;
3. set data acquisition system (DAS) 8, wait for and triggering;
4. inflate to trigger mechanism 2 by high-pressure air source 1, and emission drop bar 3;
5. drop bar 3 impacts incident bar 4 under the driving of high pressure gas, at first in incident bar 4, produce compression stress wave, because the geometric effect on inclined-plane, this compression stress wave will be decomposed into compression and shearing wave when reaching incident bar 4 with end face that sample 6 contacts, and be loaded into simultaneously on the sample 6, and be transmitted into transmission bar 7, so just realized pressing and cut dynamic syndicated loading.
6. data acquisition system (DAS) 8 realizes data acquisition by the foil gauge 5 that sticks on incident bar 4 and the transmission bar 7.
Embodiment two
As shown in Figure 2: present embodiment comprises drop bar 3, incident bar 4, transmission bar 7, two identical samples 6, drop bar trigger mechanism 2 and high-pressure air source 1.In the present embodiment, be that with the difference of embodiment one incident bar 4 end that contacts with sample is processed to sphenocephaly, and transmission bar 7 contacts an end and is processed to V-shaped groove with sample, and the inclined-plane of the V-shaped groove of the sphenocephaly of incident bar 4 and transmission bar 7 and the axis angle of bar are 30 ° simultaneously.The coaxial relative installation of V-shaped groove one end of first end of the wedge shape of incident bar 4 and transmission bar 7, two samples 6 are clipped in respectively in the middle of two inclined-planes.The other end of incident bar is provided with drop bar 3, drop bar trigger mechanism 2 and high-pressure air source 1.Data acquisition system (DAS) 8 is arranged in addition, and it is by sticking on foil gauge 5 image data on incident bar 4 and the transmission bar 7.
During experiment:
1. adjust the position of incident bar 4 and transmission bar 7, make the V-shaped groove of incident bar 4 relative with the lozenges of transmission bar 7;
2. between the lozenges with the V-shaped groove that is clipped in incident bar 4 respectively of two identical sample 6 symmetries and transmission bar 7;
3. set data acquisition system (DAS) 8, wait for and triggering;
4. inflate to trigger mechanism 2 by high-pressure air source 1, and emission drop bar 3;
5. drop bar 3 impacts incident bar 4 under the driving of high pressure gas, at first in incident bar 4, produce compression stress wave, because the geometric effect on inclined-plane, this compression stress wave will be decomposed into compression and shearing wave when reaching incident bar 4 with end face that sample 6 contacts, be loaded on the sample 6, and be transmitted into transmission bar 7, so just realized pressing and cut dynamic syndicated loading.
6. simultaneously, data acquisition system (DAS) 8 realizes data acquisition by the foil gauge 5 that sticks on incident bar 4 and the transmission bar 7.
Embodiment three
As shown in Figure 1: present embodiment comprises drop bar 3, incident bar 4, transmission bar 7, two identical samples 6, drop bar trigger mechanism 2 and high-pressure air source 1.In the present embodiment, the end machining forming V-shape groove that incident bar 4 and transmission bar 7 are adjacent, and the termination of transmission bar with matching 7 is a sphenocephaly, and the axis angle of the inclined-plane of the V-shaped groove of incident bar 4 and transmission bar 7 sphenocephalies and bar is 80 °.Incident bar 4 has an end and the coaxial relative installation of the first end of transmission bar 7 wedge shapes of V-shaped groove, and two samples 6 are clipped in respectively in the middle of two inclined-planes.The other end of incident bar is provided with drop bar 3, drop bar trigger mechanism 2 and high-pressure air source 1.Data acquisition system (DAS) 8 is arranged in addition, and it is by sticking on foil gauge 5 image data on incident bar 4 and the transmission bar 7.
During experiment:
1. adjust the position of incident bar 4 and transmission bar 7, make the V-shaped groove of incident bar 4 relative with the lozenges of transmission bar 7;
2. between the lozenges with the V-shaped groove that is installed in incident bar 4 respectively of two identical sample 6 symmetries and transmission bar 7;
3. set data acquisition system (DAS) 8, wait for and triggering;
4. inflate to trigger mechanism 2 by high-pressure air source 1, and emission drop bar 3;
5. drop bar 3 impacts incident bar 4 under the driving of high pressure gas, at first in incident bar 4, produce compression stress wave, because the geometric effect on inclined-plane, this compression stress wave will be decomposed into compression and shearing wave when reaching incident bar 4 with end face that sample 6 contacts, and be loaded into simultaneously on the sample 6, and be transmitted into transmission bar 7, so just realized pressing and cut dynamic syndicated loading.
6. data acquisition system (DAS) 8 realizes data acquisition by the foil gauge 5 that sticks on incident bar 4 and the transmission bar 7.
Embodiment four
As shown in Figure 2: present embodiment comprises drop bar 3, incident bar 4, transmission bar 7, two identical samples 6, drop bar trigger mechanism 2 and high-pressure air source 1.In the present embodiment, be that with the difference of embodiment one incident bar 4 end that contacts with sample is processed to sphenocephaly, and transmission bar 7 contacts an end and is processed to V-shaped groove with sample, and the inclined-plane of the V-shaped groove of the sphenocephaly of incident bar 4 and transmission bar 7 and the axis angle of bar are 45 ° simultaneously.The coaxial relative installation of V-shaped groove one end of first end of the wedge shape of incident bar 4 and transmission bar 7, two samples 6 are clipped in respectively in the middle of two inclined-planes.The other end of incident bar is provided with drop bar 3, drop bar trigger mechanism 2 and high-pressure air source 1.Data acquisition system (DAS) 8 is arranged in addition, and it is by sticking on foil gauge 5 image data on incident bar 4 and the transmission bar 7.
During experiment:
2. adjust the position of incident bar 4 and transmission bar 7, make the V-shaped groove of incident bar 4 relative with the lozenges of transmission bar 7;
2. between the lozenges with the V-shaped groove that is clipped in incident bar 4 respectively of two identical sample 6 symmetries and transmission bar 7;
3. set data acquisition system (DAS) 8, wait for and triggering;
4. inflate to trigger mechanism 2 by high-pressure air source 1, and emission drop bar 3;
5. drop bar 3 impacts incident bar 4 under the driving of high pressure gas, at first in incident bar 4, produce compression stress wave, because the geometric effect on inclined-plane, this compression stress wave will be decomposed into compression and shearing wave when reaching incident bar 4 with end face that sample 6 contacts, be loaded on the sample 6, and be transmitted into transmission bar 7, so just realized pressing and cut dynamic syndicated loading.
6. simultaneously, data acquisition system (DAS) 8 realizes data acquisition by the foil gauge 5 that sticks on incident bar 4 and the transmission bar 7.
Claims (1)
1. material dynamic double-pressing and shearing experimental device based on the Hopkinson bar, comprise foil gauge (5), drop bar (3), incident bar (4) and transmission bar (7), it is characterized in that a termination in incident bar (4) termination adjacent with transmission bar (7) is V-shaped groove or sphenocephaly, another termination is sphenocephaly or V-shaped groove; The axis angle of the inclined-plane of this V-shaped groove and sphenocephaly and incident bar (4) and transmission bar (7) is identical and all between 30 ° to 80 °; Being installed between V-shaped groove and sphenocephaly or sphenocephaly and the corresponding inclined-plane of V-shaped groove of two samples (6) symmetry.
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| CN104198307A (en) * | 2014-09-03 | 2014-12-10 | 安徽理工大学 | Integrated dynamic one-way compression-shear stress-strain testing device |
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| CN101806689B (en) * | 2010-04-23 | 2011-12-14 | 中南大学 | Method for measuring dynamic shear strength of brittle material by using concentric cylindrical sample |
| CN102169069B (en) * | 2011-05-30 | 2012-09-05 | 浣石 | Three-dimensional impact loading experiment device |
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| CN103471938B (en) * | 2013-08-24 | 2015-04-29 | 中国人民解放军陆军军官学院 | T-shaped Hopkinson torsion bar device |
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| CN104458446B (en) * | 2014-12-10 | 2017-01-11 | 中国科学院工程热物理研究所 | Device and method for testing shearing characteristics of non-metallic materials |
| CN107389476B (en) * | 2017-06-26 | 2019-12-13 | 宁波大学 | Large-deformation impact compression experimental method for material |
| CN107367431A (en) * | 2017-08-30 | 2017-11-21 | 中国科学院武汉岩土力学研究所 | A kind of stress wave transflector experimental system based on plane fluctuation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104198307A (en) * | 2014-09-03 | 2014-12-10 | 安徽理工大学 | Integrated dynamic one-way compression-shear stress-strain testing device |
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