Problem1. 2: Stress components oN tN acting on any inclined plane斜面上应力aNN Plane problems: projection of XN YN on the normaN will give oN, projection ofXNYN perpendicular to the normal n will give tN XNYN(XN=ox+ m y YN=mo+3)投影到法线方 向为σN,投影到和法线垂直的方向为c ON=IXN+m YN=120x+mo\+2lmwy 40 4) IN-IYN-m XN=Im(oy- 0x)+(2-m)xy(2.3.5) 徐汉忠第一版20007 弹性力学第二章徐汉忠第一版2000/7 弹性力学第二章 7 Problem1.2: Stress components N N acting on any inclined plane 斜面上应力 N N • Plane problems: projection of XN YN on the normal N will give N , projection of XN YN perpendicular to the normal N will give N XN YN(XN=lx+m yx YN=my+lxy)投影到法线方 向为 N ，投影到和法线垂直的方向为 N N=lXN+m YN=l2 x +m2y+2lmxy (2.3.4) N=lYN - m XN=lm (y - x )+(l2 - m2 )xy (2.3.5)