Abstract
Micromechanical modeling of fracture behavior of unidirectional composites has been performed by predefining the statistical distribution of fracture planes in the fiber and fiber-matrix interfaces in 2D. Five fiber segments of 2, 3, 4, 5, & 6 micron length have been randomly assembled to generate a fiber of length 900 micron. Mixed mode cohesive elements have been used to define fracture planes between fiber segments and to define fiber-matrix debonding. Experimentally determined Weibull strength distribution for S-2 glass has been used to define the stochastic normal and shear tractions for fiber fracture. Rate dependent traction and mode II energy release rate for fiber-matrix debonding have been determined by microdroplet experiments and simulations, and have been used to define the fiber-matrix interfaces. Finally, experimentally determined rate dependent non-linear matrix behavior of DER353 epoxy has been used to model the rate dependent large deformation behavior of matrix resin. Using these stochastic distribution of crack planes and rate dependent properties, punch shear simulations have been conducted to understand rate depedendent micromechanical fracture behavior and predict the rate dependent punch shear strength and punch shear modulus of unidirectional S-2 glass/DER 353 composites.
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