Abstract
A modified plasticity theory for sintered powder materials, taking into account the real complex state of porosity and micro-defects (cracks, non-metallic inclusions, etc.) is proposed. Equations for plastic flow were developed and methods for calculating the true mechanical properties are suggested. The yield criterion derived, in conjuction with simple uniaxial compression tests conducted on specimens of the porous material, may evaluate the real state of the material porosity related to micro-defects which may constitute the sources for the initiation and propagation of cracks, even in high compressive stress fields such as those developed in most manufacturing processes, as well as the formation of new pores during plastic deformation.
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