摘要
The compressive stress-strain relationships of 6061A1 alloy over wide temperatures and strain rates are investigated. The dynamic impact experiments are performed using an im- proved high temperature split Hopkinson pressure bar apparatus. The experimental results are compared with those obtained by the modified Johnson-Cook constitutive model. It is found that the dynamic mechanical behavior depends sensitively on temperature under relatively low strain rates or on strain rate at relatively high temperatures. The good agreement indicates that it is valid to adopt the parameter identification method and the constitutive model to describe and predict the mechanical response of materials.
The compressive stress-strain relationships of 6061A1 alloy over wide temperatures and strain rates are investigated. The dynamic impact experiments are performed using an im- proved high temperature split Hopkinson pressure bar apparatus. The experimental results are compared with those obtained by the modified Johnson-Cook constitutive model. It is found that the dynamic mechanical behavior depends sensitively on temperature under relatively low strain rates or on strain rate at relatively high temperatures. The good agreement indicates that it is valid to adopt the parameter identification method and the constitutive model to describe and predict the mechanical response of materials.
基金
Project supported by the State 973 Program of China (No. 2013CB03570)
the National Natural Science Foundation of China (Nos. 11272259, 11002104, 10902090 and 11021202)
