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铝锂合金材料的极限应变率软化特性研究
引用本文:郭扬,李永池,姚磊,董杰.铝锂合金材料的极限应变率软化特性研究[J].爆炸与冲击,2004,24(1):54-58.
作者姓名:郭扬  李永池  姚磊  董杰
作者单位:中国科学技术大学力学和机械工程系,安徽,合肥,230026
摘    要:通过系列准静态与动态力学实验得到了铝锂合金材料的基本力学参数。证实了该种材料具有独特的应变率软化特性 ,并揭示了材料应变率软化效应的极限性特征 ,提出了极限应变率软化材料的概念 ,从而对突加载荷下粘塑性材料中也会出现双波结构的现象给出了合理的解释。为便于实际应用 ,还对实验得到的材料应力 应变曲线进行了拟合 ,提出了一种便于实际应用的材料本构关系的具体形式 ,即双幂次应变硬化 极限幂次应变率软化本构关系。

关 键 词:固体力学  极限应变率软化  本构关系  铝锂合金  动态力学实验  合金材料  极限应变率软化  软化特性  研究  alloy  property  softening  软化本构关系  应变硬化  幂次  材料本构关系  拟合  应变曲线  应力  力学实验  应用  解释  现象  波结构  粘塑性材料
文章编号:1001-1455(2004)01-0054-05
修稿时间:2003年2月9日

Study on the limit strain-rate softening property of Al-Li alloy
GUO Yang,LI Yong chi,YAO Lei,DONG Jie.Study on the limit strain-rate softening property of Al-Li alloy[J].Explosion and Shock Waves,2004,24(1):54-58.
Authors:GUO Yang  LI Yong chi  YAO Lei  DONG Jie
Abstract:In this paper, with the series of quasi static and dynamic experiments of mechanics, the basic mechanical parameters of the Al/Li alloy have been obtained. By comparison of the experimental results of different strain rates, it is shown that the Al/Li alloy has the extraordinary property of strain rate softening. Also the limit characteristics of the strain rate softening of the material are revealed, based on which the concept of limit strain rate softening material is proposed so that the existence of double wave phenomenon in viscoplastic material is reasonably explained. Furthermore, we have completed the fitting of the experimental strain stress curves, and presented one concrete form of the constitutive model of the material convenient for practical application, which is a constitutive relation of double powers strain hardening with a limit and power strain rate softening.
Keywords:solid mechanics  limit strain  rate softening  constitutive relation  Al/Li alloy  dynamic experiments
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