关键词: 复变应力函数, 分区广义变分原理, 应力强度因子, 加筋板

Abstract:

An analytical method is proposed to determine the stress intensity factor of" a stiffened panel with cracks in sheet and in stringer on the basis of complex stress functions and zonal generalized variational principles. The crack boundary conditions are satisfied exactly by complex stress functions and the other boundary conditions are satisfied approximatively by zonal generalized variational principles. As an example we consider a stiffened panel with a central crack in the sheet and an edge crack in the stringer. The load is uniform tensile stress applied normally to the crack plane. The expressions of stress intensity factors are giren.

Key words: Complex stress function, Zonal generalized variational principle, Stress intensi- ty factor, Stiffened panel