A New Combined Compression-shear Loading Technique at High Strain Rates
一种新的高应变率复合压剪实验技术

Based on the modified split Hopkinson bar(SHB),a new planar dynamic loading technique combining compression-shear under strain rates in range of 10~2~10~3s~-1 is proposed in this paper.In order to generate shear and compressive stresses simultaneously in specimen,the oblique-plate impact experiment is introduced.The end surface of the input bar is improved in the shape of cut-cone.The main purpose of this work is to acquire the constitutive equation under complex stresses loaded at high strain-rates.Related theoretic analysis and numerical simulation prediction of the technique are presented.The stress wave propagation in the specimen is calculated by using the explicit dynamic FEM-code LS-DYNA.A preliminary test is carried out.The results of the simulation and test show that the combined compression-shear loading can be realized in the specimen by this technique,Therefore a systematic understanding on complicated mechanical properties of the materials can be obtained with this technique.