Study Of The Residual Strength Of The Structure Of The Multi-site Damage

In this dissertation, the stress intensity factors and the residual strength of panels with multiple site damage are studied in detail. Using the complex potential method in the plane theory of elasticity of an anisotropic body, a series solution to the stress field of a finite plate containing multiple cracks subjected to arbitrary loads is obtained by means of the Faber series expansion, and the stress intensity factors at the crack tips are calculated based on the theories of fracture mechanics. Equivalence yield stress is introduced in order to consider the effects of the plastic zones, with which the strip yield criteria is developed in the article so that the effects of structural size and the crack interactions on the stress distribution can be considered accurately. The effects of plate size, crack size and crack distributions on the stress intensity factors as well as the residual strength of the plate are studied detailedly. Several conclusions valuable to practices are drawn.