According to the stress and Galerkin's variational principles, the mixed variational equations for the laminated shell are presented, from which the state equation is obtained.
根据应力变分原理和伽辽金变分原理，导出叠层圆柱壳的混合变分方程，并将其转换成状态方程。
2
Giving up any assumptions about displacement models and stress distribution, the state equation for the axisymmetric problems of thick closed laminated cylindrical shells is established.
抛弃任何有关应力或位移模式的人为假设，在轴对称情况下，对强厚度叠层闭口柱壳建立其状态方程。
3
Based on the third order zigzag displacement model, a bending theory for laminated composite plates in an initially stressed state is derived by use of the principle of virtual work.