MECHANICAL MODELING OF INITIATION OF LOCALIZED YIELDING UNDER PLANE-STRESS CONDITIONS IN RIGID-RIGID POLYMER ALLOYS
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Twodimensional Finite Element Method simulations, which involve consideration of the nonlinearity of a material, have been conducted to gain understanding about the rigidrigid polymer toughening concept we proposed. The simulation results for the plane stress condition indicate that as long as the inclusion phase possesses (i) a 60% difference in the tangent modulus from that of the matrix at any given strain level prior to failure or (ii) smaller yield or craze stain than the yield strain of the matrix, then, localized shear yielding will occur around the inclusion. A toughened rigidrigid polymer alloy system can then be obtained. The plain strain case is also discussed with an implementation of the rigidrigid polymer toughening concept. Copyright 1991 Society of Plastics Engineers