铝-锂合金应变率负敏感效应及动态韧性现象

THE INVERTED STRAIN-RATE SENSITIVITY OF Al-Li ALLOYES AND THEIR PROPERTIES OF DYNAMIC DUCTILITY

本文从实验上揭示了铝-锂合金奇特的应变率负敏感效应和动态韧性特性,并应用作者所建议的无屈服型粘塑性本构模型对其力学行为从理论上进行了描述和讨论。

In this research.the specimens of 270AI-Li alloy subjected to three different thermal-heated conditions are tested by different static and dynamic experimental method. Through comparision of the static and dynamic experimental results, it is shown that Al-Li alloyes have the unusual effects of inverted strain-rate sensitivity and properties of dynamic ductility. Furthermore, for the purpose of practical applications, the above mechanical behaviours of the Al-Li alloy are described and discussed theoretically by use of the no-yield visco-plastic model which was proposed by the authors. The theoretical calculated curves show consistency with the experimental very well.