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假定材料的屈服是一种宏观的滑移现象,而此滑移又是在许多随机取向截面上的颗粒微观滑移的基础上产生的。若假定微观滑移的条件是τn=τcr(式中τn是某一随机取向截面上的剪应力,τcr是沿该面滑移的临界剪应力),由于该截面取向可以是任意的,因此在研究宏观滑移和屈服条件时,必须取全部随机取向截面上的τn和τcr的均方值来考虑,亦即研究均方剪应力(?)和临界均方剪应力(?),下面首先计算均方剪应力。
It is assumed that the yield of the material is a macroscopic slip phenomenon, which is generated on the basis of the microscopic slip of particles on many randomly oriented sections. If it is assumed that the microscopic slip condition is τn=τcr (where τn is the shear stress at a randomly oriented cross-section and τcr is the critical shear stress that slides along the plane), since the cross-section orientation can be arbitrary, When studying macroscopic slip and yield conditions, the mean square values of τn and τcr on all randomly oriented sections must be considered. That is, the mean square shear stress (?) and the critical mean square shear stress (?) must be considered. Mean square shear stress.