Numerical Simulation for Compressive Failure of CFRP Laminates with Various Shaped Holes

The effect of stress concentration on compressive failure behavior of carbon-fiber reinforced plastic e laminates with open holes was experimentallyand numerically investigated. Theaspectratiooftheellipticholewaschangedtodeterminethedependenceofthefailurebehavior on stress concentration.Thefiniteelement analysiswas implemented byusing theABAQUS 2017 softwareand a dynamicexplicit solving method.Continuum shellelementsincorporating Hashin’s failure criteria and cohesive interaction, which is a combined function of the general contact definition and cohesive traction-separation law, were used to model lamina and interlaminar damagegrowths,respectively.Thedamage initiationsweredefined bycritical stresses,while the damage evolutions were defined byenergyassumptions of softening behavior for the continuum shell elements and cohesive interactions.The numerical results of the stresses at initial damage occurrences and ultimate failures agreed wellwith the experimental results for the specimens of variousaspectratios.Moreover,thenumericalandexperimentalresultsofthedamagebehaviorof the0°plywerein good agreement.Furthermore,wediscussed internaldamagesand delamination behaviors,which aredifficult to observethrough experiments,based on thenumericalresults.