尺寸效应下的紫铜薄板力学性能试验研究  

Experimental Investigation into Mechanical Properties of Copper Sheet with Size Effects

作　　者：张赛军[1] 龚小龙[1] 李健强[1] 周驰[1] 袁宁[1] 

机构地区：[1]华南理工大学机械与汽车工程学院∥广东省精密装备与制造技术重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2016年第10期8-14,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51375172);材料成形与模具技术国家重点实验室开放基金资助项目(P2014-02);华南理工大学中央高校基本科研业务费专项资金资助项目(20152208)~~

摘　　要：通过对0.1、0.2、0.4、0.6、0.8和1.0 mm厚的T2紫铜薄板在不同温度(450、650和850℃)下的热处理,获得不同的晶粒尺寸的试样,并采用数字图像相关性(DIC)方法对单向拉伸试验中的变形进行了测量,获得了相关力学性能参数(屈服强度、抗拉强度、最大均匀应变和断裂应变)与晶粒尺寸和板料厚度之间的关系.实验结果表明:所考察的退火T2紫铜薄板的力学性能参数均表现出明显的尺寸效应,抗拉强度、最大均匀应变和断裂应变均随材料厚度的减小或晶粒尺寸的增大而减小,且与厚度晶粒尺寸比呈近似指数关系.The tensile samples 1.0 mm T2 copper at 450, 650 of different grain sizes were obtained by heating 0. 1, 0. 2, 0.4, 0.6, 0. 8 and and 850 ℃. Then, the deformation of the samples in uniaxial tension tests was measured by the digital image correlation （DIC） method, and the relationships between the relevant parameters （namely, the yield strength, the tensile strength, the maximum uniform strain and the fracture strain） and the grain size as well as the sheet thickness are evaluated. Experimental results show that the mechanical properties of the annealed T2 copper sheet show an obvious size effect; specifically, the tensile strength, the maximum uniform strain and the fracture strain decrease with the decrease of the sheet thickness or the increase of the grain size, and they all have an approximate exponential relationship with the ratio of the sheet thickness to the grain size.

关 键 词：尺寸效应 数字图像相关性 力学性能 T2紫铜 

分 类 号：TH142.3[一般工业技术—材料科学与工程]