Abstract
The elastic and elastic-plastic analysis of a biaxially loaded, stiffened panel has been carried out using the finite element method. The elastic-plastic analysis was accomplished assuming Prandtl-Reuss material behavior. The influence of biaxial load ratios on crack openings, stresses in the stringer, plastic zone size and (J) was studied. The analytical results of crack openings and stresses in the stringer are compared to the experimental results. It is found that contrary to the behavior of unstiffened structures, the (J) values and crack openings increase for positive biaxial load ratios in cracked stiffened structures.
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