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Split Hopkinson Pressure Shear Bar Testing Technique

Author: ZhaoPengZuo
Tutor: LuFangYun
School: National University of Defense Science and Technology
Course: Engineering Mechanics
Keywords: Hopkinson bar compression shear test High strain rate LiNbO3 Stress wave SHPB
CLC: O347.41
Type: Master's thesis
Year: 2007
Downloads: 223
Quote: 4
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Abstract


This article is based on the clear understanding and solving SHPSB (split Hopkinson pressure shear bar, Split Hopkinson Pressure ShearBar) experimental techniques exist theoretical and experimental problems, improve SHPSB experimental techniques. First, existing domestic and dynamic techniques combined compression and shear loading experiments were reviewed, focusing on the principle of SHPSB experimental techniques, based on this experiment are given SHPSB technology needs analysis study. Brief elastic bending wave theory, analysts pointed out that the transmission lever for SHPSB experimental perturbations can bend elastic bending waves described. Using the LS-DYNA3D finite element analysis software on the transverse rod under the impact of stress wave propagation and impact of both horizontal and vertical rod stress wave propagation simulation study results show that the rod bending waves and longitudinal wave propagation decoupled. Careful experiments on SHPSB numerical simulation and experimental analysis of the sample rod stress state. Experimental results show that the technique SHPSB axial load on the sample average stress line, which indicates SHPSB experimental techniques the dynamic response of the material is obtained having an average response of the mechanical loading. While the study found, the transmission lever compression strain gauge load is equal to the measured sample average compression under load, experimental techniques described SHPSB compression test is reasonable. Analysis of the sample, the average shear interface and transmission poles in different locations mean shear, the results show that the transmission lever in the location of the shear stress meter is equal to the average shear average shear specimen interface, indicating that the measured shear stress meter data is valid. Design improves SHPSB shear stress meter calibration experiment experimental method for shear stress meter calibration experiments were carried out to obtain a piezoelectric coefficient of shear stress meter. Analyzes and summarizes the results of the four possible influence factors intuitively given its impact on the experimental results. SHPSB comparative sample free of the contact SHPB experiments and experimental results prove indirectly processing the measured incidence of strain gauge strain strain loading the sample of the incident is reasonable. Experiments designed plugging experimental results were compared with SHPSB, the experimental results show that the experimental technique can reasonably reflect SHPSB mechanical properties of materials. Finally, experimental results using the long sample SHPSB sample destruction and recycling instructions SHPSB form of indirect experimental techniques are reasonable. Finally experimental techniques that need improvement and development aspects, especially the improvement of shear testing technology and multi-dimensional stress calculation or measurement methods.

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Deformation solid dynamics > Stress wave > Elastic wave
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