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Study of constitutive mode and dynamic mechanical properties of composites at different temperatures

BAI Zhen_ping 1, HAN Xiao_ping 2 (1. Xi'an Institute of Technology, Xi'an 710032, China; 2. Northwestern Polytechnic University, Xi'an 710072, China)  
Impact tensile experiments of glass_cloth/epoxy laminates under different temperatures are carried out, the curves of stress_strain are measured, and the Young's modulus, tensile strength and Poisson's ratio of the laminates are obtained. A study of failure process for the laminates under different conditions is also conducted. The experiment results show that the dynamic response of the laminates is clearly dependent upon temperatures and strain rates and there exists dynamic toughness in the laminates. A design method of tensile sample of composite laminates is reported. According to the experimental results, a constitutive equation of glass_cloth/epoxy laminates is developed, and with which strain rate dependence and thermo_softening effect of the laminates can be described clearly.
【CateGory Index】: TB33
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