[SY-J1] Symposium J-1

[SY-J1] A-DiSC (Adaptive Discrete-Smeared Crack) Model for Multi-Scale Progressive Damage Analysis of Composite Structures

Invited

^○Tong-Earn Tay, Xin Lu, Vincent Beng-Chye Tan (National University of Singapore, Singapore)

Laminated fibre-reinforced composite structures often fail in a complex progressive damage process involving interaction of mulitple failure mechanisms, including matrix cracking, interfacial delamination, local micro-buckling and fibre rupture. Modeling these multi-scale mechanisms in a single simulation with sufficient fidelity to the physics while retaining computational efficiency still presents a formidable challenge. Discrete crack models (DCMs)^1-3 offer excellent fidelity, especially for modeling multiple crack interactions, but are impractical and inefficient for structures larger than coupon sizes. Recently, an adaptive DCM has been proposed to improve computational efficiency⁴. On the other hand, smeared crack models (SCMs)^5,6 are suitable for describing diffuse damage such as micro-cracks but unable to properly account for local coupling effects and final fracture. In this presentation, an adaptive discrete-smeared crack model (A-DiSC) is proposed, whereby the DCM is initially used to model matrix cracks and their interaction with delaminations via cohesive interface elements, but non-critical cracks are later converted to diffused damage using SCM. The transitional region from DCM to SCM is effected through satisfaction of certain criterion based on the principle of energy conservation³. The proposed A-DiSC model is applied to the tensile failure analysis of open-hole composite laminates.