HOMOGENIZED RESPONSE OF COMPOSITE MATERIALS SUBJECTED TO MIXED MODE LOADING CONDITIONS
The aim of this paper is to study the effects of damage initiation and evolution due to microcracking along an a-priori unknown path on the homogenized constitutive properties of elastic composite materials. A micro-mechanical approach based on homogenization techniques and fracture mechanics concepts is presented. The crack propagation process is driven by the maximum energy release rate criterion, which is used to predict incremental changes in crack path, whereas a coupled stress energy criterion is adopted to predict crack initiation within originally undamaged microcon stituents or at bimaterial interfaces. To this aim a novel strategy for quasi-automatic simulation of propagation of arbitrary cracks in 2D finite element models has been implemented by taking advantage of a generalized J-integral formulation, accounting for material non-homogeneity and crack propagation under mixed mode loading conditions. Numerical simulations are carried out for two typical 2D composite microstructures: a porous composite material with initial edge cracks and a particle reinforced composite material with an initially undamaged inclusion/matrix interface. Results highlight the capability of the proposed approach to provide the nonlinear macroscopic response of composite materials for different prescribed macro-strain path directions.
crack initiation mixed mode crack propagation homogenization periodic composites contact finite elements
Domenico Bruno Fabrizio Greco Paolo Lonetti Paolo Nevone Blasi
Department of Structural Engineering, University of Calabria, Cosenza, Italy
国际会议
广州
英文
272-281
2010-12-17（万方平台首次上网日期，不代表论文的发表时间）