Can a three-dimensional composite really provide better mechanical performance compared to two-dimensional composite under compressive loading?

2018 ◽  
Vol 38 (2) ◽  
pp. 49-61 ◽  
Author(s):  
M Tarfaoui ◽  
M Nachtane
Keyword(s):  
Mechanical Performance ◽  
Split Hopkinson Pressure Bar ◽  
Compressive Loading ◽  
Three Dimensional ◽  
Woven Composites ◽  
Two Dimensional ◽  
Hopkinson Pressure Bar ◽  
Out Of Plane ◽  
Split Hopkinson ◽  
Pressure Bar

A series of split Hopkinson pressure bar tests on two-dimensional and three-dimensional woven composites were presented in order to obtain a reliable comparison between the two types of composites and the effect of the z-yarns along the third direction. These tests were done along different configurations: in-plane and out-of-plane compression test. For the three-dimensional woven composite, two different configurations were studied: compression responses along to the stitched direction and orthogonal to the stitched direction. It was found that three-dimensional woven composites exhibit an increase in strength for both: in-plane and out-of-plane tests.

A comparative study on dynamic mechanical performance of concrete and rock

2015 ◽  
Author(s):  
Xia Zhengbing ◽  
Zhang Kefeng ◽  
Deng Yanfeng ◽  
Ge Fuwen
Keyword(s):  
Mechanical Performance ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
Peak Strain ◽  
Hopkinson Pressure Bar ◽  
Dynamic Mechanical ◽  
Strain And Strain Rate ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Relationship Of

Recently, engineering blasting is widely applied in projects such as rock mineral mining, construction of underground cavities and field-leveling excavation. Dynamic mechanical performance of rocks has been gradually attached importance both in China and abroad. Concrete and rock are two kinds of the most frequently used engineering materials and also frequently used as experimental objects currently. To compare dynamic mechanical performance of these two materials, this study performed dynamic compression test with five different strain rates on concrete and rock using Split Hopkinson Pressure Bar (SHPB) to obtain basic dynamic mechanical parameters of them and then summarized the relationship of dynamic compressive strength, peak strain and strain rate of two materials. Moreover, specific energy absorption is introduced to confirm dynamic damage mechanisms of concrete and rock materials. This work can not only help to improve working efficiency to the largest extent but also ensure the smooth development of engineering, providing rich theoretical guidance for development of related engineering in the future.

Dynamic Deformation Behavior of Rubber under High Strain Rate Compressive Loading

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1415-1420 ◽  
Author(s):  
Ouk Sub Lee ◽  
Myun Soo Kim ◽  
Kyoung Joon Kim ◽  
Si Won Hwang ◽  
Kyu Sang Cho
Keyword(s):  
Strain Rate ◽  
Deformation Behavior ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Deformation ◽  
Compressive Loading ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Transition Points ◽  
Dynamic Deformation Behavior ◽  
Pressure Bar

A specific experimental method, the split Hopkinson pressure bar (SHPB) technique is used to determine the dynamic material properties under the impact compressive loading condition with strain-rate of the order of 103/s~104/s. The dynamic deformation behavior of rubber materials widely used for the isolation of vibration from varying structures under dynamic loading is determined by using the Split Hopkinson Pressure Bar technique. The relationships between the stresses at transition points of rubber materials and the strain rate are found to be bilinear. However, an interesting relationship between the strains at transition points of rubber materials and the strain rate, which needs further investigation, is noted.

Split Hopkinson pressure bar testing of 3D woven composites

2011 ◽  
Vol 71 (9) ◽  
pp. 1196-1208 ◽  
Author(s):  
M. Pankow ◽  
A. Salvi ◽  
A.M. Waas ◽  
C.F. Yen ◽  
S. Ghiorse
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Woven Composites ◽  
Hopkinson Pressure Bar ◽  
3D Woven Composites ◽  
Split Hopkinson ◽  
Pressure Bar

The mechanical properties of copper zinc and aluminium tested in compression

1972 ◽  
Vol 327 (1568) ◽  
pp. 23-46 ◽  
Keyword(s):  
Mechanical Behaviour ◽  
Split Hopkinson Pressure Bar ◽  
Compressive Loading ◽  
Strain Curve ◽  
Hopkinson Pressure Bar ◽  
Gas Gun ◽  
Split Hopkinson ◽  
Copper Zinc ◽  
Pressure Bar ◽  
Wave Induced

The mechanical behaviour of some metals has been investigated experimentally for compressive loading cycles of approximately 100 and 370 μs duration and for steady-state compressive loading. For the dynamic measurements the split Hopkinson pressure bar technique has been used in which cylindrical specimens are sandwiched between two rods and deformed under the action of a compressive stress wave induced by impacting the free end of one of the rods with a projectile launched by a light gas gun. The experimental results show that for the available range of strain rates the stress-strain curve is independent of strain rate. These results are compared with the mechanical behaviour predicted by a particular form of nonlinear mechanical equation of state.

Feasibility of Two-Dimensional Numerical Analysis of the Split-Hopkinson Pressure Bar System

1974 ◽  
Vol 41 (1) ◽  
pp. 137-144 ◽  
Author(s):  
L. D. Bertholf
Keyword(s):  
Numerical Analysis ◽  
Numerical Solutions ◽  
Split Hopkinson Pressure Bar ◽  
Material Strength ◽  
Two Dimensional ◽  
Hopkinson Pressure Bar ◽  
Interface Friction ◽  
Elastic Plastic ◽  
Split Hopkinson ◽  
Pressure Bar

The feasibility of two-dimensional numerical analysis of the split-Hopkinson pressure bar experiment is proven. A general elastic-plastic artificial viscosity computer program is shown to give an adequate solution for two-dimensional elastic response of a pressure bar subjected to a Heaviside step loading in time which is applied uniformly over the end. This elastic solution agrees with other numerical solutions and with asymptotic series solutions. An elastic specimen is used to verify the split-Hopkinson pressure bar numerical analysis and a numerical solution is also obtained for an elastic-plastic specimen. Special emphasis is placed on the two-dimensional response of the specimen including the sliding between the bars and the specimen with two extremes of interface friction. For large interface friction it is found that induced multidimensional stresses give the appearance of increased material strength which may be misconstrued as a strain-rate effect.

Dynamic Response of Soil Under S.H.P.B. Loading

1995 ◽  
Author(s):  
J. F. Semblat ◽  
G. Gary ◽  
M. P. Luong
Keyword(s):  
Grain Size ◽  
Dynamic Response ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Testing ◽  
Three Dimensional ◽  
Hopkinson Pressure Bar ◽  
Promising Tool ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Deviatoric Stresses

Abstract Soil dynamic response has been little investigated under fast loading conditions. Split Hopkinson Pressure Bar method leads to the determination of dynamic behaviour of various materials. A special experimental device called three-dimensional S.H.P.B provides dynamic response of soil specimens in both axial and radial directions (oedometric tests). Comparisons with other loading paths (mean and deviatoric stresses) give usefull elements on granular soil behaviour under high strain rates. The results are also analysed at grain-size scale (grain-size distribution, fracture energy). Experimental results show that 3D-Split Hopkinson Pressure Bar is a promising tool for laboratory dynamic testing on soils.

Dynamic Compressive Performance of Concrete Exposed to High Temperature Based on Microstructure Analysis

2013 ◽  
Vol 357-360 ◽  
pp. 1389-1394 ◽  
Author(s):  
Shao Wei Yang ◽  
Zhi Guo Liu ◽  
Yong Wei Wang ◽  
Zi Rui Liu ◽  
Heng Jing Ba
Keyword(s):  
High Temperature ◽  
Split Hopkinson Pressure Bar ◽  
Compressive Loading ◽  
Hopkinson Pressure Bar ◽  
Normal Concrete ◽  
Mechanics Performance ◽  
Compressive Performance ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Gauge Measurement

Combined with strain gauge measurement method, the modified split Hopkinson pressure bar was adopted to investigate the behavior of normal concrete and steel fiber reinforcement concrete exposed to 400°C and 800°C under axial impact compressive loading. The experimental results show that compared with normal temperature, the compressive strength and elasticity modulus of normal concrete exposed to 400°C and 800°C decrease obviously. The transformation of concrete exposed to high temperature in microstructure is analyzed by SEM. The influence of high temperature on macro mechanics performance is discussed.

Analysis of the Impact of the Frequency Range of the Tensometer Bridge and Projectile Geometry on the Results of Measurements by the Split Hopkinson Pressure Bar Method

2013 ◽  
Vol 20 (4) ◽  
pp. 555-564 ◽  
Author(s):  
Wojciech Moćko
Keyword(s):  
Test Bench ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Deformation ◽  
Spectral Width ◽  
Hopkinson Pressure Bar ◽  
Computing Environment ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
The Impact ◽  
Bench Model

Abstract The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient

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