中国机械工程Issue(5)：689-693,5.DOI:10.3969/j.issn.1004132X.2015.05.021
基于应变梯度塑性理论的微塑性成形力学性能
Mechanical Properties of Micro Plastic Forming Based on Strain Gradient Theory
摘要
Abstract
The unilateral stretching,microhardness,and microbending tests of T2 copper samples with different thicknesses show that the mechanical behavior of material is relevant to the intrinsic characteristics of material:the tensile strength of sheet material with thickness of 30μm is increased by 28% compared with that of the sheet material with thickness of 150μm,the tensile strength of the fine grain with average grain size D of 50μm is improved by 33% compared with that of the coarse grain with average grain size D of 120μm,with the “the finer,the stronger”characteristic displayed. When the ratio of the indentation depth to the sheet thickness is more than 0•2,the deeper the inden-tation is,the harder the indentation is,with the “the deeper,the harder”characteristic displayed. The springback angle decreases as the thickness of the sheet increases.When the thickness of sheet is less than a certain value (0•06 mm),the strain gradient hardening effect of the material makes the change of springback angle with the change of sheet thickness stronger.This change is substantially consistent with the results predicted by using the strain gradient plastic theory.关键词
T2 紫铜/力学性能/应变梯度理论/微塑性成形Key words
T2 red copper/mechanical property/strain gradient theory/micro plastic forming分类
矿业与冶金引用本文复制引用
郭幼丹,程晓农..基于应变梯度塑性理论的微塑性成形力学性能[J].中国机械工程,2015,(5):689-693,5.基金项目
国家自然科学基金资助项目(50772044) （50772044）
福建省自然科学基金资助项目(2014J01200) （2014J01200）
福建省教育厅科技计划资助项目(JA12197) （JA12197）
