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Biglari, Farid
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article
Evaluation of fracture mechanics parameters for a range of weldment geometries with different mismatch ratios
Abstract
<p>The elastic-plastic fracture mechanics J-integral parameter and its analogous creep fracture mechanics parameter C<sup>*</sup>, are widely employed to characterise the material's fracture and crack growth behaviour over a range of temperatures and loading configurations. Experimentally the non-linear component of the J-integral and C<sup>*</sup> parameter are evaluated using the geometry dependent fracture mechanics parameter the η factor. For weldments, the η factor is dependent on the relative size and yield strength properties of the base (parent) and weld materials and their mismatch ratio. In this work, the η factor has been evaluated for six fracture geometries using non-linear finite element method for a power law hardening material, and the results have been compared with literature where available. The obtained results, which fall within the best upper/lower bounds, are tabulated for each geometry and the recommended η for a range of mismatch factors are given as a function of the normalised crack length.</p>