In the theory of elastic thin plates, to solve the problem of rectangular overhanging plates with complicated boundary conditions is very hard for long.
对于具有复杂边界条件的矩形外伸板，在弹性薄板理论中是一个较难解决的问题。
2
A new boundary integral equation is introduced to analyze plane elastic problems with cracks, and the boundary element numerical method based on this equation is established.
给出一个适用于平面断裂力学分析的新边界积分方程，在此方程的基础上建立了边界元数值计算方法。
3
For scholars and engineers the bending of reinforced concrete plates, especially free boundary plates, on elastic foundation has long been a concerned problem.