Yield condition and dissipation function for porous materials
DOI:
https://doi.org/10.24136/atest.2018.477Keywords:
plasticity, elasticity, yield condition, strength criterion, dissipation, metals, cast iron, porous materialsAbstract
A yield condition was proposed in this paper and associated dissipation function was derived via singular Legendre transformation. As a result, an explicit form of the dissipation function was obtained, which can be used for dual formulation of perfect plasticity model. The three-parameter yield condition enables continuous transition from the Drucker-Prager to Huber-Mises yield conditions by appropriate selection of free parameters. Calibration of the free parameters based on typical experimental tests was discussed. Based on the proposed yield function, a constitutive model of elastic-plastic material was given. The model can be used for modelling porous metals and other frictional materials.
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