Abstract
With regard to the quantitative modelling of delayed hydride cracking (DHC), it has been shown in Part I [9] that when a lenticular shaped hydrided region, i.e. one whose length is large compared with its thickness, forms at a planar surface or at the surface of a very blunt notch, the compressive stress σH induced within the region is markedly influenced by the unconstrained transverse precipitation strains as well as the unconstrained normal strain. The σH values are approximately the same irrespective of whether we assume that (a) the overall unconstrained expansion strain associated with hydride precipitation is confined entirely to the normal direction or (b) the strain is partitioned approximately equally between the three orthogonal directions. Thus, assuming the strain to be entirely in the normal direction allows for both precipitation strain scenarios.
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