通过对 0. 1、0. 2、0. 4、0. 6、0. 8 和 1. 0mm 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 of different grain sizes were obtained by heating 0. 1,0. 2,0. 4,0. 6,0. 8 and 1. 0mm T2 copper at 450,650 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.