题目

英语翻译
Outwardly directed normal stresses are called tension or tensile stresses and are considered positive.Shear stresses on a positive face of an element are positive if they act in the positive direction of a reference axis;such is the case in Fig.2-1a.The first subscript of a shear-stress component is the coordinate normal to the element face.The shear-stress component os parallel to the axis of the second subscript.Since the element shown is in static equilibrium,the negative faces will have shear stresses acting in the opposite direction;these are also considered positive.

提问时间：2021-03-18

答案

向外的正应力是拉伸或拉伸应力和剪切应力被认为是积极的.在一个元素的正面积极的如果他们的行为在一个基准轴的正方向；在fig.2-1a.the第一下标剪切应力分量的坐标单元法线面临的情况就是这样.剪应力分量操作系统平行...