Fracture Toughness of Whisker Reinforced Ceramics
By use of a probabilistic fracture model, a numerical simulation method for deformation and fracture behavior of whisker reinforced ceramics is developed first. A crack in whisker reinforced ceramics is regarded as the crack with a cohesive stress acting on the crack surface, and then the tension-softening relation is derived on the basis of a micromechanical study. After the numerical simulation method is constructed by incorporating the tension-softening relation in an FEM scheme, we simulate the load-load point displacement relationship for an edge-cracked bend specimen of a SiC whisker/alumina composite. The fracture toughness determined from the simulated maximum load is consistent with that obtained from experiment.
P. W. R. Beaumont and Y. Shibuya
M. Katagiri et al., "Fracture Toughness of Whisker Reinforced Ceramics", Key Engineering Materials, Vol. 430, pp. 41-46, 2010