کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
278149 | 1430278 | 2012 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A thermomechanical constitutive model for phase transformations in silicon under pressure and contact loading conditions A thermomechanical constitutive model for phase transformations in silicon under pressure and contact loading conditions](/preview/png/278149.png)
Most of the technologically relevant abrasive machining techniques for silicon (Si) such as lapping, sawing and grinding are based on the interaction of the silicon surface with a hard particle or asperity. It has been long established that the governing deformation mechanism for Si under such contact loading conditions is stress induced phase transformation. The present work introduces a novel phenomenological constitutive model for phase transformations of silicon set up in a thermomechanical framework of broad applicability. Taking into account experimental observations as well as first principle and molecular dynamics calculations, it captures both the cd-Si → β-Si transition upon compression and the β-Si → a-Si transition upon rapid decompression, which are most relevant for indenter loading. The model was numerically implemented in analogy to incremental plasticity and successfully applied for finite-element (FE) simulations of nanoindentation.
Journal: International Journal of Solids and Structures - Volume 49, Issues 11–12, 1 June 2012, Pages 1316–1324