95 Creep under multiaxial stresses

The secondary creep rate under multiaxial stresses is found using the constitutive equation for metallic foams (equation (7.12)):

In uniaxial tension, we have that oe = o11 and om = o11 /3, giving 0 = o11. For uniaxial stress we have that 9<0/9<o11 = 1 and we know that

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