Delamination Of Composite Material Using Virtual Crack Closure Technique And Cohesive Zone Method For Automotive Structure And Semi-structure

This paper studied Mode Ι delamination of Composite material using Virtual Crack ClosurernTechnique and Cohesive Zone methods for Automobile Application. Quasi-Isotropic glassrnfiber/epoxy composite material is developed using Autodesk composite simulation designrnsoftware. Mode Ι isotropic delamination propagation of quasi-isotropic composite materialrnmodeled on [email protected] for both Virtual Crack Closure Technique and Cohesive Zone rnmethods. Virtual Crack Closure Technique with different mesh density as well different viscosityrnto overcome convergence difficulty are investigated. In Cohesive Zone method interface isrnassumed as damageable homogenous zero thickness layer of cohesive element between tworncomposite layers. Load-Displacement curve is investigated by varying interfacial strength, penaltyrnstiffness and viscosity to improve convergence by lowering either both or one, but excessivelyrnlowering is done taking care of over-softening. Design of quasi-isotropic composite with stackingrnsequence of [(-45rn0rn0rn0 rn,45rn0rn,902rn, 02rn )2 ]s has Elastic modulus of 30900MPa, Shear modulus of rn10300MPa and Poisson’s ratio of 0.293, using this material property critical delamination loadrnand displacement are obtained from the analytical method , Virtual Crack Closure Technique andrnCohesive Zone methods simulation are 32N,5.9mm and 32.35 N,4.9mm and 30.82N, 5.58mmrnrespectively.

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