ABSTRACT

In this paper, we study the adiabatic kinetics of martensitic phase transition induced by shock loading. Our main goals are to reveal the effect of thermal–mechanical coupling on phase interface propagation by demonstrating the wave profiles to the impact loading. First, a kinetics and constitutive model for shape memory TiNi alloy with thermo-mechanical coupling effect was preliminarily established based on the laws of thermodynamics. Then the numerical results show that phase transformation shock waves during shock loading and unloading would be aroused due to the nonlinear hardening since adiabatic temperature rise. The shock front and the temperature interface were coupled to each other. Moreover, the adiabatic temperature rise across the transformation shock front effectively reduces the driving force of phase transition and increases the propagation velocity of phase transition wave. Finally, the theoretical results are compared with the experimental results. The comparison results reflect the intrinsic thermo-mechanical coupling characteristic of shape memory TiNi alloy with strong nonlinear constitutive behaviour and kinetics, which will be helpful for temperature controlling for TiNi alloy material and structures subjected to blast or impact loading.

摘要

在本文中，我们研究了由冲击载荷引起的马氏体相变的绝热动力学。我们的主要目标是通过展示冲击载荷的波形来揭示热-机械耦合对相界面传播的影响。首先，基于热力学定律，初步建立了具有热-机械耦合效应的形状记忆TiNi合金的动力学和本构模型。然后数值结果表明，由于绝热温升引起的非线性硬化会引起冲击加载和卸载过程中的相变冲击波。激波前沿和温度界面相互耦合。而且，相变激波前缘的绝热温升有效地降低了相变的驱动力，增加了相变波的传播速度。最后，将理论结果与实验结果进行比较。对比结果反映了具有强非线性本构行为和动力学的形状记忆TiNi合金固有的热-机械耦合特性，这将有助于TiNi合金材料和结构承受爆炸或冲击载荷的温度控制。