Elastic–plastic property closures for hexagonal close-packed polycrystalline metals using first-order bounding theories
Elastic–plastic property closures for hexagonal close-packed polycrystalline metals using first-order bounding theories
复制标题
使用一阶边界理论的六方密排多晶金属的弹塑性闭合
DOI：
10.1016/j.actamat.2006.12.010
复制
发表时间：
2007
期刊：
影响因子：
9.4
通讯作者：
S. Kalidindi
中科院分区：
文献类型：
--
作者：
Xianping Wu;G. Proust;M. Knezevic;S. Kalidindi
属性闭包描述了给定材料系统中宏观(同质化)属性的理论上可行的完整组合。最近提出了一种新的光谱框架，称为微结构敏感设计(MSD)，并被证明能够描述许多复合材料系统中的弹塑性性质闭合。特别是，它被成功地应用于立方多晶，其中假设晶体织构对感兴趣的宏观尺度性质具有主导影响。将这些过程应用于六角形多晶体造成了显著的计算困难，因为与立方体多晶体相比，需要在傅立叶空间中以更大数量的维度来表示HCP多晶体中的织构。本文报道了用MSD谱框架描述HCP多晶的弹塑性闭合的新计算方案。本文的重点继续放在晶体织构对材料的宏观各向异性弹性刚度、宏观各向异性拉伸屈服强度和宏观R比(拉伸变形模式中横向应变之比)的影响上。
Property closures delineate the complete set of theoretically feasible combinations of macroscale (homogenized) properties in a given material system. A novel spectral framework called microstructure sensitive design (MSD) was recently formulated and demonstrated to be capable of delineating elastic–plastic property closures in a number of composite material systems. In particular, it was successfully applied to cubic polycrystals, where it was assumed that the crystallographic texture had a dominant influence on the macroscale properties of interest. Application of these procedures to hexagonal polycrystals posed significant computational difficulties, because of the need to represent the texture in the hcp polycrystals in a much larger number of dimensions in the Fourier space compared with what was needed for the cubic polycrystals. This paper reports new computational schemes for delineating elastic–plastic closures for hcp polycrystals using the spectral framework of MSD. The primary focus of this paper continues to be on the influence of the crystallographic texture (in the hcp polycrystal) on the components of the macroscale anisotropic elastic stiffness, macroscale anisotropic tensile yield strength, and the macroscale R ratios (ratio of the transverse strains in tensile deformation mode) exhibited by the material.