【摘要】 根据分离式Hopkinson压杆实验以及准静态实验得到的泡沫铝材料在不同温度以及不同应变率下的应力-应变曲线,分析了泡沫铝本构方程中温度效应与应变率效应之间的耦合关系,即温度越高,泡沫铝的应变率效应越显著。基于Sherwood和Frost提出的泡沫材料本构关系框架,对常温下的应变率敏感系数进行了温度项修正,修正后的本构方程在高温高应变率下与实验结果具有较好的一致性。最终得到泡沫铝在一定密度范围内包含温度项、应变率项较为完备的本构方程。更多还原

【Abstract】 The results of split Hopkinson pressure bar(SHPB)and quasi-static compression tests for aluminum foam at different strain rates and temperatures are used to explore its constitutive relation. It is revealed that there is a coupling of the temperature effect and the strain rate effect,namely the higher the temperature is,the more significant the strain rate effect of the aluminum foam is.In the framework of Sherwood and Frost constitutive relation,with appropriate correction of the strain rate sensitivity coefficient considering the coupling effects between temperature and strain rate,a constitutive equation of aluminum foam is proposed.The results show that the revised constitutive equation can fit the experimental results well in the density,temperature and strain rate ranges considered.更多还原