International Journal of Aerospace and Lightweight Structures (IJALS)Volume 2 Number 2 (2012)
A Comparative Study for the Progressive Failure Analysis of Double-Notched Glass/Epoxy Composite Laminates
This work proposes a comparative study for the progressive damage analysis of doublenotched glass/epoxy composites with layups [90/0]s and [45/90/−45/0]s. The material property degradation method (MPDM) is used to model the intra-lamina failure whereas cohesive elements (CE) are employed to account for the delamination at the interfaces. Different fracture mechanics-based and continuum damage mechanics-based failure theories are considered in the MPDM-CE approach and a comparative study of these failure theories is presented. The predictions are compared with the experimental results reported by Hallett andWisnom . Reasonably good agreement between experiment and simulation is obtained, showing that the MPDM-CE approach can effectively predict the progressive failure in double-notched glass/epoxy composite laminates. Furthermore, it is significantly revealed that a modification scheme for the progressive failure modeling of fiber failure may be necessary to improve the strength prediction of notched composites.
Keywords: Progressive failure, Double-notched composite, Material Property Degradation Method (MPDM), Cohesive element, Failure criterion.