In this paper, an efficient elastic-plastic finite element procedure to analyze crack-closure and, its effects on fatigue crack growth under general spectrum loading, is presented. A hybrid-displacement finite element procedure is used to properly treat the stress and strain singularities near the crack-tip; and crack-growth under cyclic loading is simulated by the translation of certain ″core″ elements, near the crack-tip, in which proper stress and strain singularities were embedded. Both pure Mode I and Mode II types of cyclic loading are considered. Certain observations, based on the present numerical results, concerning various factors that cause crack growth acceleration or retardation under general spectrum loading, are presented and discussed.
|State||Published - Jan 1 2017|
|Event||Collect Tech Pap AIAA ASME Struct Struct Dyn Mater Conf 20th - St Louis, MO, USA|
Duration: Apr 4 1979 → Apr 6 1979
|Conference||Collect Tech Pap AIAA ASME Struct Struct Dyn Mater Conf 20th|
|City||St Louis, MO, USA|
|Period||04/4/79 → 04/6/79|