Polar coordinates极坐标 The position of a point p in polar coordinates is defined by the radial coordinate r and the angular coordinate 点P的极坐标用径向坐标r和角坐标0表示 displacements:位移 8 uu strains:应变: r 8e rre stresses:应力: Or oe tre body force:体力:KrK 徐汉忠第一版20007 弹性力学第四章 2徐汉忠第一版2000/7 弹性力学第四章 2 Polar coordinates 极坐标 • The position of a point P in polar coordinates is defined by the radial coordinate r and the angular coordinate . 一点P的极坐标用径向坐标r和角坐标表示 P (r, ) • displacements:位移： ur u • strains:应变: r  rr • stresses: 应力： r  r • body force:体力: Kr K