کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1703286 | 1012370 | 2015 | 14 صفحه PDF | دانلود رایگان |
Surface effects, usually embodied as surface tension or surface energy, become considerable in nanostructured materials. With attention to static finite deformations, we present a theoretical analysis about the surface energy effects on the evolution of a nanovoid in a plastic material. The following improvements have been incorporated based on the previous studies: (a) the initial configuration is assumed to be the equilibrium state, which is reached by applying the surface tension onto a fictitious stress-free configuration; (b) both cases of applying compressive and tensile hydrostatic stress is discussed. This illustrative solution provides some reasonable physical interpretations of the following “unconventional” phenomena: (a) when the void radius is smaller than some critical value, finite plastic flow happens in the process from the fictitious stress-free configuration to the initial configuration, which will dramatically influence the subsequent responses; (b) size effects exist, i.e., the growth of nanovoids is closely related to their sizes; (c) the tension–compression asymmetry becomes stronger with decreasing the void size; (d) void shrinkage instability can arise.
Journal: Applied Mathematical Modelling - Volume 39, Issue 17, 1 September 2015, Pages 5091–5104