کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
798444 | 1467172 | 2006 | 28 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Quantum mechanics based multiscale modeling of stress-induced phase transformations in iron Quantum mechanics based multiscale modeling of stress-induced phase transformations in iron](/preview/png/798444.png)
The ground state crystal structure of Fe, ferromagnetic body-centered cubic (bcc), undergoes a stress-induced martensitic phase transformation to a hexagonally close-packed (hcp) structure. Both bcc and hcp have been observed to coexist over a large range deformations, such that the nonlinearities in the constitutive behavior of each phase need to be included for an accurate description. We present herein a methodology to construct high-fidelity quantum mechanics based nonlinear elastic energy densities, amenable to be included in microstructural optimization procedures like sequential lamination. We use the model to show that the transition pressure (TP) has a strong dependence on relatively small amounts of shear deformation, and to investigate the value of the TP under uniaxial compressions, presumably found in shock-loaded materials. Results hint that more complex deformation patterns may need be present to be consistent with measured experimental values.
Journal: Journal of the Mechanics and Physics of Solids - Volume 54, Issue 6, June 2006, Pages 1276–1303