A Thermodynamic Constitutive Model for Stress Induced Phase Transformation in Shape Memory Alloys

In this paper a thermodynamic constitutive model is developed for stress induced phase transformation in single crystalline and polycrystalline shape memory alloys (SMAs). Volume fractions of different martensite variants are chosen as internal variables to describe the evolution of microstructure state in the material. This model is then used in prediction the transformation behavior of a SMA (Cu-Al-Zn-Mn) under complex thermomechanical load (including complete and incomplete transformation in mechanical cycling, and proportional/non-proportional loading). (C) 2002 Elsevier Science Ltd. All rights reserved.

易燃混合气体爆炸完全基元反应模型数值模拟

采用完全基元反应模型和高精度ENO 格式对易燃混合气体爆炸过程进行了数值研究。对H2/O2/Ar 混合 气体起爆和爆轰波传播过程的数值模拟结果表明, 计算的爆轰波阵面参数和实验相当符合。对爆轰波反应区化学 反应的研究表明, 参与反应的不同组分具有不同类型的变化特征, 这些特征为爆炸灾害的预防设计提供了线索。