The effective yielding characterization of ductile matrix composites containing randomly located yet unidirectionally aligned elastic spheroidal reinforcements is investigated. The ensemble-volume averaging procedure is employed to micromechanically derive the effective yield function of composites based on the probabilistic spatial distribution of aligned spheroidal particles and the particle-matrix interaction. The proposed effective yield surfaces of composites are shown to be convex. The initial effective yield criterion of composites under axisymmetric loading is specifically discussed.

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