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- W1607054536 abstract "Ductile cracked structures yield locally under load to form a plastic zone (pz) around their crack tips. As the crack behavior strongly depends on this pz size, and as most cracked structures design routines depend on it, its precise estimation is a problem of major practical importance. The first classical pz estimates are based only on the stress intensity factor (SIF), but their precision is limited to very low nominal stresses. Improved estimates have been proposed considering the T-stress, obtained from the Williams series zero order term. However, neither SIF, nor SIF+T-stress based estimates can reproduce linear elastic (LE) stress fields that satisfy all boundary conditions in cracked components. In particular, the nominal stresses far from the crack tip, which have a major influence on the predicted pz size and shape. To prove this point, this paper first presents the complete LE stress field solution for the Griffith plate, using three different methods to arrive in the same analytical solution: the first is based on its Westergaard stress function, the second starts from the equivalent Inglis plate (considering its elliptical notch root as equal to about half the crack tip opening displacement), and the third is based on the complete Williams series. Next it introduces the equilibrium corrections necessary to compensate for the stress limitation inside the plastic zone. Then it compares pz estimates generated from this complete solution with classical SIF and SIF+T-stress pz estimates for various nominal stress to yield strength ratios, demonstrating the importance of using correct stress fields to evaluate such pz, particularly for the relatively high ratios used in high-performance structures. Finally, it speculates that for more complex structures, where the component geometry and type of loading may also significantly influence pz sizes and shapes, the plastic zones can be better estimated by a similar approach." @default.
- W1607054536 created "2016-06-24" @default.
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- W1607054536 date "2011-02-25" @default.
- W1607054536 modified "2023-09-27" @default.
- W1607054536 title "Comparing improved crack tip plastic zone estimates considering corrections based on T-stresses and on complete stress fields" @default.
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