TiNi合金的动态伪弹性行为和率相关相变本构模型  

Dynamic pseudoelastic behavior of TiNi alloys and a strain rate dependent phase transition constitutive model

作　　者：郭扬波[1] 刘方平[1] 载翔宇[1] 唐志平[1] 虞吉林[1] 

机构地区：[1]中国科学技术大学力学和机械工程系,安徽合肥230027

出　　处：《爆炸与冲击》2003年第2期105-110,共6页Explosion and Shock Waves

基　　金：国家自然科学基金项目(10176029);国家基金委和中国工程物理研究院联合基金项目(10072058)

摘　　要：采用万能材料试验机和SHPB实验技术对TiNi形状记忆合金在10-3s-1和102s-1应变率下的伪弹性相变行为进行了实验研究。实验数据表明:TiNi合金的相变过程具有应变率效应,其原因主要是相变阻力受应变率影响———应变率越大,相变阻力越大。在三线性热弹性相变模型的基础上,考虑了应变率对相变阻力的影响,并给出了相变阻力的具体形式,建立了一个一维率相关相变本构模型。模型对TiNi合金相变行为的模拟与实验数据吻合较好。With a material test system and a split Hopkinson pressure bar, the pseudoelastic phase transition behavior of TiNi shape memory alloys, at strain rates of 10-3 and 102 s-1 has been investigated. By analyzing the experimental data, it is shown that the resistance of phase transition increase with the strain rate and obviously has a strain rate dependence. An one-dimensional phase transition constitutive model based on the trilinear thermoelastic phase transition model is established, where the strain rate effects upon the resistance of phase transition was taken into account in this article. The model applied to TINi alloy is in good agreement with the experimental data.

关 键 词：固体力学 相变本构模型 三维性热弹性理论 TINI形状记忆合金 相变阻力 应变率 

分 类 号：O344.1[理学—固体力学]