کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
278173 | 1430269 | 2012 | 9 صفحه PDF | دانلود رایگان |
Fatigue crack advance induced by the application of cyclic quasistatic loads is investigated both numerically and analytically using a lattice spring model. The system has a quasi-one-dimensional geometry, and consists in two symmetrical chains that are pulled apart, thus breaking springs which connect them, and producing the advance of a crack. Quasistatic crack advance occurs as a consequence of the plasticity included in the springs which form the chains, and that implies a history dependent stress–strain curve for each spring. The continuous limit of the model allows a detailed analytical treatment that gives physical insight of the propagation mechanism. This simple model captures key features that cause well known phenomenology in fatigue crack propagation, in particular a Paris-like law of crack advance under cyclic loading, and the overload retardation effect.
► Cyclic fatigue propagation is observed in lattice spring models.
► Fatigue is originated in the plasticity included in the spring behavior.
► Analytical results for crack advance are provided in limiting cases.
► Paris like curves and the overload effect are qualitatively reproduced.
Journal: International Journal of Solids and Structures - Volume 49, Issues 23–24, 15 November 2012, Pages 3224–3232