The Parametric High-Fidelity-Generalized-Method-of-Cells (PHFGMC) micromechanicalmodel is extended to include refined local cohesive formulation for simulatingweak discontinuities in multiphase composites. The nonlinear parametricHFGMC governing equations are obtained from a two-layered (local-global) virtualwork principle and solved using a new incremental-iterative formulation. This offerscomputational efficiency over previously published work on HFGMC since thesystem of equations is symmetric. In addition, this formulation enables implementingadvanced traction-separation laws available in the literature and allows maintainingthe symmetric matrix structure for computational efficiency. Two cohesive zonemodels were integrated with the PHFGMC with unique nonlinear formulation. Thesewere the non-potential model proposed by Camanho and Davila (CD) and the potentialbased PPR model. This paper presents the newly verified modeling approachwith the new cohesive capabilities. New PHFGMC-Cohesive results are shown to bein good agreement with those from a finite element analysis for various configurationsand loading patterns. Progressive damage in composites using the PHFGMCCohesivemodel is also demonstrated.
展开▼
