Numerical, micro-mechanical prediction of crack growth resistance in a fibre-reinforced/brittle matrix compositeMicromechanics fracture models are incorporated into three distinct fracture process zones which contribute to the crack growth resistance of fibrous composites. The frontal process zone includes microcracking, fiber debonding, and some fiber failure. The elastic process zone is related only to the linear elastic creation of new matrix and fiber fracture surfaces. The wake process zone includes fiber bridging, fiber pullout, and fiber breakage. The R-curve predictions of the model compare well with empirical results for a unidirectional, continuous fiber C/C composite. Separating the contributions of each process zone reveals the wake region to contain the dominant crack growth resistance mechanisms. Fractography showed the effects of the micromechanisms on the macroscopic fracture behavior.
Document ID
19910067293
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jenkins, Michael G. (Oak Ridge National Laboratory TN, United States)
Ghosh, Asish (Philips Display Components Co. Ann Arbor, MI, United States)
Salem, Jonathan A. (NASA Lewis Research Center Cleveland, OH, United States)