Initial stress method

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Initial stress method


This method involve an explicit relationship between increments of stress and strains. Thus, elasto-plasticty is described by:






where Eep represents the generalized tangent constitutive matrix.


For perfect plasticity in the absence of hardening or softening the tangent consitutive matrix can be obtained particularizing the equation 51:








The body loads Fbi in the stress redistribution process are reformed at each iteration by summing the following integral for all elements that posses yielding Gauss integration points:






This method is used in conjunction with the forward Euler approach to integrating the elasto-plastic rate equation, extrapolating from the point at which the yield surface is crossed.










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