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Fracture Modeling of Damaged Stiffened Panels under Lateral Pressure Load

Numerical modelling and simulations were carried out in order to analyze fracture mechanisms for stiffened panels, damaged by a single and multiple cracks, and subjected to lateral pressure. For that purpose finite element models for stiffened panel specimens were developed using shell elements. Material property data used in the simulation were obtained from the tensile test and fracture test on a centrally notched tension specimen. By implementing elastic plastic fracture mechanics concepts (EPFM) critical pressures associated with fracture onset in the specimens were assessed based on the critical J-integral and CTOD parameters. Simulated critical pressure loads for stiffened panel specimens were compared with experimental results and a good agreement was observed. The developed procedure can be applied to real thin-walled structures.

Modeling; Elastic-plastic fracture mechanics; J-integral; CTOD; Stiffened panel

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