Abstract
The microplastic behavior of several MMC is invesbgated by means of tension and compression tests. This behavior is assymetric: the proportionnal limit is higher in tension than in compression but the work hardening rate is higher in compression. These differences are analysed in terms of maxium of the Tresca's shear stress at the interface (proportionnal limit) and of the emission of dislocation loops during the cooling (work hardening rate). On another hand, a model is proposed to calculate the value of the yield stress, describing the composite as a material composed of three phases: inclusion, unaffected matrix and matrix surrounding the inclusion having a gradient in the density of the thermally induced dilocations
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