A new four - node axisymmetric element ach8 is derived based on the combined hybrid variational principle , which uses wilson ' s displacements and linear stress suffering from energy compatibility . the resulting element exhibits excellent results in displacements and stresses and is suitable for nearly incompressible materials without any locking phenomena , insensitive to mesh distortion 本文首先基于組合雜交變分原理推導出4節(jié)點的軸對稱元ach8 ,其位移插值采用wilson非協(xié)調位移模式,應力在等參坐標系下采用關于wilson位移完全能量協(xié)調的不完全線性多項式。