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This paper describes a two-dimensional (2D) finite element simulation forfracture and fatigue behaviours of pure alumina microstructures such as thosefound at hip prostheses. Finite element models are developed using actual Al2O3microstructures and a bilinear cohesive zone law. Simulation conditions aresimilar to those found at a slip zone in a dry contact between a femoral headand an acetabular cup of hip prosthesis. Contact stresses are imposed togenerate cracks in the models. Magnitudes of imposed stresses are higher thanthose found at the microscopic scale. Effects of microstructures and contactstresses are investigated in terms of crack formation. In addition, fatiguebehaviour of the microstructure is determined by performing simulations undercyclic loading conditions. It is shown that crack density observed in amicrostructure increases with increasing magnitude of applied contact stress.Moreover, crack density increases linearly with respect to the number offatigue cycles within a given contact stress range. Meanwhile, as appliedcontact stress increases, number of cycles to failure decreases gradually.Finally, this proposed finite element simulation offers an effective method foridentifying fracture and fatigue behaviours of a microstructure provided thatmicrostructure images are available.

Two-dimensional finite element simulation of fracture and fatigue behaviours of alumina microstructures for hip prosthesis