Simple Shear of Porous Materials at Large Strains

TLDR: In this paper, an early suggestion by Schleicher (1926) for the plastic yield condition of porous materials reads {fy(1)|335-1} where τ = ((3/2)S··S)1/2 is the Mises effective stress, S = σ − pI is the stress deviator, σ is the Cauchy stress tensor, I = (1/3)I··σ is the hydrostatic stress and (YC,YT) are the uniaxial yield stresses in compression and in tension

Abstract: An early suggestion by Schleicher (1926) for the plastic yield condition of porous materials reads {fy(1)|335-1} where τ = ((3/2)S··S)1/2 is the Mises effective stress, S = σ − pI is the stress deviator, σ — the Cauchy stress tensor, I — the 2nd order unit tensor, p = (1/3)I··σ is the hydrostatic stress and (YC,YT) are the uniaxial yield stresses in compression and in tension, respectively.