Analysis of interfacial de-bonding failure on stiffened composite panel

Abstract

Abstractor This article aimed at the interfacial de-bonding between the stringer and skin when the structure is under post-buckling loads. A four-point bending test was set up, and the cohesive zone model (CZM) was employed considering the effects of through-thickness compression on the inter-laminar shear failure of composite laminates. The numerical result is in good agreement with the experimental one. The results indicate that: embedded defect at the flange/skin interface has a slight influence on the load capacity of the structure, but embedded defect at the flange/radius-filler interface has a significant influence on the load capacity of the structure, and delamination always initiated at the flange/radius-filler interface. The presence of inner corner defects in the filled area has a greater impact on the load capacity of the structure, the load capacity is in direct proportion to the width of corner defects.