Journal of Science and Technology of Composites

Determination of cohesive zone parameters in mode I delamination growth of a double cantilever beam specimen using inverse method

Document Type : Research Paper

Authors

School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

Abstract

In this study, delamination growth in mode I loading of unidirectional laminated composites with R-curve effect was investigated. To this end, a finite element simulation of delamination growth in double cantilever beam (DCB) performed using the cohesive zone model (CZM) based on traction-separation laws. By increasing the delamination length in DCB specimens, the strain energy release rate increases and for this reason the simple traction-separation law such as bilinear are not capable to predict the load-displacement curve of this specimens accurately. To solve this shortcoming, cohesive zone models with multi-linear traction-separation laws were proposed to predict delamination behavior of the DCB specimens numerically. Afterwards, by minimizing the difference between experimental and numerical load-displacement curves using optimization method based on genetic algorithm, cohesive zone parameters are characterized. A comparison of the results obtained by cohesive laws with experimental data show that four-linear cohesive law can predict the maximum bridging stress as well as the experimental load-displacement curve accurately.

Keywords

References
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Journal of Science and Technology of Composites
Volume 4, Issue 1
June 2017
Pages 83-90
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