材料的塑性泊松比μ_p和弹塑性泊松比μ_(ep)

PLASTIC POISSONS RATIO p AND ELASTICPLASTIC POISSON'S RATIO epOF MATERIAL

本文在塑性变形体积不可压缩的条件下导出了以塑性应变εｐ定义的塑性泊松比μｐ和以弹塑性总应变εｅｐ定义的弹塑性泊松比μｅｐ的计算式，指出在小变形范围内可以看作μｐ＝０．５，而μｅｐ则总是小于０．５；当变形较大时，无论是μｐ还是μｅｐ均远小于０．５。

from the condition of incompressibility of the volume under the circumstances of plastic deformationthis paper derives plasticelastic poisson's ratio P,which is defined by the plastic ratio p which is defined by the plastie strain p and elasticplastic poisson's ratio ep which is defined by the whole elastic plastic strain ep are derived. It also points out that there is indeed p=05 within the region of small deformation,but ep will never be biger than 05, and when the deformation is larger,no matter whether it is p and ep it will be far less than 05 In this paper the counting formula is provided for solving the problem of large deformation