82 State of Stress at a point.一点的应力 Problem 1: When the six stress components o Oy O, txy tx ty at a certain point P are known, we want to find the stress acting on any inclined plane passing through the point. Let the outward normal to the inclined plane be n and the direction cosines of n be I=coS(N, x)m=cos(N, y) n=cos(N Z 问题1:已知1P点的σ、,TT2过P 点的斜面的法线方向余弦,m,n,求斜面上应力 徐汉忠第一版20007 弹性力学第二章 4徐汉忠第一版2000/7 弹性力学第二章 4 8.2 State of Stress at a point. 一点的应力 • Problem 1: When the six stress components x y z xy xz yz at a certain point P are known, we want to find the stress acting on any inclined plane passing through the point. Let the outward normal to the inclined plane be N and the direction cosines of N be l=cos(N,x) m=cos(N,y) n=cos(N z) • 问题1：已知 1.P点的x y z xy xz yz 2.过 P 点的斜面的法线方向余弦l,m,n,求斜面上应力