Computational-Experimental Approach to Hierarchical Modeling of Damage and Failure in Non-Uniform Composite Materials

摘要

Progress has been made in advancing the state of the art in multiple- scale modeling of damage in composite materials, as delineated below. Interfacial Debonding Analysis in Multiple Fiber Reinforced Composites: Decohesion at multiple fiber interfaces of elastic fiber reinforced composites is modeled by the Voronoi cell finite element model (VCFEM). Interfacial debonding is accommodated by cohesive zone models and simulations are compared with results from experiments, performed using cruciform specimens of fiber polymer-matrix composites. A Multi-level Computational Model for Multi-scale Damage Analysis in Composite and Porous Materials: An adaptive multi-level methodology is developed to create a hierarchy of computational sub-domains with varying resolution for multiple scale problems. It concurrently predicts variables at the structural and microstructural scales and tracks microstructural damage. VCFEM conducts microstructural analysis, while a displacement based FEM code executes the macroscopic analysis. The adaptive process increases efficiency and accuracy. Experimental-Computationai Investigation Of Damage Evolution In Discontinuously Reinforced Composite: A combined experimental-computational approach to study the evolution of microscopic damage to cause failure in commercial SiC particle reinforced DRA's. Aspects of microstructural geometry that are most critical for damage nucleation and evolution are accomplished. Micromechanical modeling of 2D micrographs are conducted with VCFEM. Inferences on the initiation and propagation of damage are made from the 2D simulations.