Abstract
A theoretical investigation has been made of the strains accumulating in the steady state creep of butt-welded joints. This was done by using a refined plate theory-Cosserat plate theory. Appropriate constitutive equations were developed for the theory which correspond to standard uniaxial and three-dimensional equations. In particular, a choice of Norton's Law, ≐ = Aσ n was made. Then, the plane strain problem of a plate containing a weld of different mechanical and creep properties was solved for the case of tensile loading. Results were obtained both numerically and analytically for a wide range of parameter values: for different ratios of the creep strengths, A, of the parent and weld metals, for values of the index, n, (including the limit n → ∞) and for values of the length, l, of the weld (including the limit l → 0).
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