EXPERIMENTAL OBSERVATION AND MECHANISM ANALYSIS OF THE SHEAR FAILURE NEAR THE IMPACT INTERFACE FOR POLYPROPYLENE UNDER COMBINED COMPRESSION AND SHEAR SHOCK LOADING
(0) The impact response of polypropylene under combined compression and shear loading was investigated by using the inclined planar plate impact technique and the IMPS system.Experimental results show two findings1.Remarkable shear attenuation occurs near the impact surface when the impact velocity Uo and inclination angle reached critical values,same as observed in PMMA 1 and Nylon-66 2.2.The transverse wave velocity increases nonlinearly with the impact velocity,even close to the longitudinal wave speed,which indicates that its shear behavior is intensively related to the hydrostatic pressure. In this article,the mechanism regarding shear wave attenuation is analyzed.Firstly,a melting layer (I.e.Shear failure) of about 2-3 μm thick near the impact surface is detected with the micro-observation of recovered samples,which causes the decay of shear waves.Furthermore,the numerical modeling and simulation reveal the mechanism and process of the adiabatic layer near the impact interface and the relationship with the coarseness of the interface.With the micro-observations of nylon-66 and polypropylene,such decay behavior might be the general characteristic of polymers.
Combined Compression and Shear shock Loading shear wave attenuation adiabatic shear band
Ting Li Zhiping Tang
Key Laboratory for Mechanical Behavior and Design of Materials(LMBD),Department of Modern Mechanics,University of Science and Technology of China,Hefei,230026,China
国际会议
第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)
安徽黄山
英文
511-514
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）