缩颈
引伸计
十字头
材料科学
极限抗拉强度
复合材料
有限元法
应力-应变曲线
应变计
拉伸试验
压力(语言学)
延伸率
流离失所(心理学)
拉伤
结构工程
变形(气象学)
医学
心理学
语言学
哲学
内科学
工程类
心理治疗师
抗弯强度
作者
Yaohua Zhao,Yuan‐ji Guo,Qian Wei,Troy D. Topping,Andrea M. Dangelewicz,Yuntian Zhu,Terence G. Langdon,Enrique J. Lavernia
标识
DOI:10.1016/j.msea.2009.06.031
摘要
Miniature tensile specimens, having various sizes and geometries, are often used to measure the mechanical properties of bulk nanostructured materials. However, these samples are generally too small for use with conventional extensometers so that the strains are usually calculated from the crosshead displacements. This study uses experimental results and finite element modeling (FEM) to critically evaluate the influence of the specimen dimensions and strain measurement methods on the tensile curves obtained from miniature specimens. Using coarse-grained Cu as a model material, the results demonstrate that the values of strain obtained from the crosshead displacement are critically influenced by the specimen dimensions such that the uniform elongation and the post-necking elongation both increase with decreasing gauge length and increasing specimen thickness. The results provide guidance on the optimum procedures for the tensile testing of miniature specimens of both coarse-grained and nanostructured materials.
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