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基于多尺度特征应变均匀化计算HCP多晶体塑性
Eigen-strain-based multiscale homogenization application for HCP
投稿时间:2018-06-25  修订日期:2018-08-14
DOI:
中文关键词:  晶体塑性  特征应变  均匀化  密排六方晶体
英文关键词:crystal plasticity  eigen-strain  homogenization  HCP crystal
基金项目:国家重点基础研究发展计划(2010CB832700)
作者单位E-mail
刘洋 大连理工大学 liu_vehicle_dlut@163.com 
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中文摘要:
      本文采用基于位错密度的晶体塑性模型与特征应变均匀化方法相结合分析HCP晶体结构材料的力学行为。研究目的在于开发一种计算模型用于有效捕捉以及预测微观与结构尺度的裂纹产生。首先与传统的晶体塑性有限元相比,该多尺度模型可以提高计算效率并同时保持微观尺度的捕捉精度。其次将模型与试验结果的差值为优化目标,在满足物理学定义的条件下得到合理的材料参数。最终在结构尺度的模拟,显示该模型可以获取在结构尺度与微观晶粒尺度的潜在裂纹生长区域。
英文摘要:
      A dislocation density based crystal plasticity method is applied with the eigen-strain-based homogenization to investigate the thermo-mechanical responses in titanium alloys. The objective of our study is to devise a computational model that could efficiently track and predict the crack initiation at both micro- and structural-scale. First, the proposed model is compared with the classical crystal plasticity finite element method, which shows its improvement of efficiency while retaining the accuracy in describing the response at micro-scale. Second, the parameters are obtained within the physical range and the error between simulation and experiment is treated as the optimization goal for the calibration. Finally, a structural-scale simulation shows that the proposed model can pinpoint the potential crack initiation sites throughout the structure and at grain level accuracy.
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