摘要
在总结分析现有多晶体材料微观组织三维有限元建模方法的基础上,提出了一种考虑真实晶粒与晶界形态的三维有限元建模方法,并以IMI834钛合金为例给出了详细的建模过程。通过连续切片方法与图像数值化方法构建了钛合金真实组织的三维有限元模型,并基于共用结点识别法生成了具有一定几何厚度的晶界单元,进而实现了IMI834钛合金真实组织及晶界形貌的高效表达。对获得的三维有限元模型赋予真实的晶粒取向,并通过施加边界条件实现了多晶体材料变形的仿真预测。可以发现,该多晶体材料微观组织三维有限元建模方法在模拟预测多晶体材料不均匀变形以及晶界损伤等方面具有适用性。
Based on the summary and analysis of the existing microstructure based three-dimensional( 3 D) finite element modeling methods for polycrystalline materials,a 3 D finite element modeling method considering actual grain and grain boundary morphology was proposed,and the detailed modeling process was described with the example of IMI834 titanium alloy. The 3 D finite element model was constructed by continuous sectioning method and image numeralization method. Based on the shared node recognition method,the grain boundary elements with a geometry thickness were generated,and then the high-efficiency description of actual microstructure and grain boundary morphology of IMI834 titanium alloy was realized. The actual grain orientations were mapped on the finite elements,and the simulation of the polycrystalline material was realized by applying boundary conditions. It can be found that the 3 D finite element modeling method for polycrystalline materials is applicable to predict the heterogeneous deformation and the gliding and damage of grain boundaries of polycrystalline materials.
作者
李宏伟
孙新新
詹梅
黄栋
LI Hong-wei;SUN Xin-xin;ZHAN Mei;HUANG Dong(Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第7期6-12,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51675433)。
关键词
塑性成形
多晶体材料
晶界
微观组织
多尺度建模
plastic forming
polycrystalline materials
grain boundary
microstructure
multiscale modeling
