Only the radial displacement takes place只有径向位移 人 A A Fig.4.2.1 the angle of rotation of pa will be 0=0 the angle of rotation of Pb will beββ=(BB PP)/PB=u+ou /aede)-u/rde=our/rae rre=a+B=Ou /(ra0) 徐汉忠第一版20007 弹性力学第四章徐汉忠第一版2000/7 弹性力学第四章 9 Only the radial displacement takes place只有径向位移 • the angle of rotation of PA will be =0 • the angle of rotation of PB will be  =(BB- PP)/PB=[(ur+ur /d)-ur ]/rd=ur /(r) • rr =+=ur /(r)