Predicting cohesive zone parameters in mode I delamination growth of laminated composites using inverse method

The main purpose of this study is to investigate the delamination growth in unidirectional double cantilever beam (DCB) specimen with large scale bridging effect. To this end, the cohesive zone model with the multi-linear traction-separation law is proposed to predict the delamination behavior of the DCB specimen numerically. By minimizing the difference between experimental and numerical load-displacement curves using an optimization method based on the genetic algorithm, cohesive zone parameters are characterized. A comparison of results obtained by cohesive law with experimental data shows that four-linear cohesive law can predict the maximum bridging stress as well as the experimental load-displacement curve accurately.

کلیدواژه ها:

Large scale bridging ، R-curve effect ، Delamination ، Cohesive law ، Genetic algorithm