2/18/2023 0 Comments Thermoplastic yield strengthGood agreement was found between the experimental results and the proposed model.In mechanical testing empirical correlations are often used for estimating yield stress values from hardness values. In the range between 0.2 and 0.35, both failure modes were observed in the populations tested. At vf above 0.35, a brittle failure mechanism dominated. For filler volume fractions below 0.2, yielding of the composite by combined microcavitation and shear deformation was the principal failure mechanism. Maleic anhydride grafted PP (MPP) was used to promote adhesion. CaCO3 was either treated with stearic acid to prevent adhesion between constituents or used as received. The properties of calcium carbonate filled PP homopolymer were measured over a wide range of filler volume fractions. Upper and lower bounds for brittle failure strength are characterized using a strength‐of‐materials approach and stress concentration factors for both “perfect” and “zero” adhesion. The particulate concentration and the matrix ductility are the prime factors in controlling the brittle failure of the composite. When there is no adhesion between constituents, a modified version of an equation by Nicolais and Narkis adequately describes a lower bound for the tensile yield strength. Utilizing Sjoerdsma's model for interacting stress concentration fields, one can determine the concentration dependence of the yield strength below the critical filler volume fraction. When there is perfect adhesion between constituents, an upper bound for tensile yield strength is found to be 1.33 times the matrix yield strength above a critical volume of particulate concentration. The effects of the filler volume fraction and strength of adhesion on the mode of tensile failure of a particulate reinforced polypropylene (PP) are investigated using finite element simulation (FES). The yield strength of particulate reinforced thermoplastic composites The yield strength of particulate reinforced thermoplastic composites
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