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立方晶系多晶体细观马氏体相变有限元模拟

FINITE ELEMENT ANALYSIS ON MICROSCOPIC MARTENSITIC TRANSFORMATION OF CUBIC SYSTEM POLYCRYSTAL
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摘要 从马氏体相变切变机理入手,考虑相变体积变化,定义相变机械驱动能及其等效驱动应力,并在假设细观化学驱动能均匀的前提下,建立细观动力学模型.在此模型基础上,通过Marc软件二次开发,开展弹塑性立方晶系多晶体单向拉伸下的应力耦合细观马氏体相变有限元模拟.有限元模型的每个单元同时代表一个材料主轴随机分布的晶粒,屈服准则采用立方晶系单参数Hill准则,细观相变率与细观等效驱动应力关系取指数形式.三个多晶体样本模拟显示:1)细观马氏体相变分布不均匀,且不均匀程度随增量步增加呈先快后慢的减弱;2)多晶体宏观相变率-宏观拉伸应力模拟曲线呈指数态势,但在整个加载过程中,相变量均较细观模型的小. 从马氏体相变切变机理入手,考虑相变体积变化,定义相变机械驱动能及其等效驱动应力,并在假设细观化学驱动能均匀的前提下,建立细观动力学模型.在此模型基础上,通过Marc软件二次开发,开展弹塑性立方晶系多晶体单向拉伸下的应力耦合细观马氏体相变有限元模拟.有限元模型的每个单元同时代表一个材料主轴随机分布的晶粒,屈服准则采用立方晶系单参数Hill准则,细观相变率与细观等效驱动应力关系取指数形式.三个多晶体样本模拟显示:1)细观马氏体相变分布不均匀,且不均匀程度随增量步增加呈先快后慢的减弱;2)多晶体宏观相变率-宏观拉伸应力模拟曲线呈指数态势,但在整个加载过程中,相变量均较细观模型的小.
出处 《固体力学学报》 CAS CSCD 北大核心 2011年第S1期47-52,共6页 Chinese Journal of Solid Mechanics
关键词 立方晶系多晶体 细观马氏体相变 弹塑性 有限元模拟 cubic system polycrystal microscopic martensitic transformation elasto-plastic finite element simulation
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