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Formulation of anisotropic damage in quasi-brittle materials and ...

I2(0) = 1.;. I2(1) = 1.;. I2(2) = 0.;. I2(3) = 0.;. I2xI2 = I2^I2;. I4(0,0) = 1.;. I4(1,1) = 1.;. I4(3,3) = 1.;. J4 = I4 - 1./2. * I2xI2;.



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