期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 47, 期 24, 页码 3341-3351出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2010.08.014
关键词
Multi-physics; Titanium; Failure; Embrittlement; Alpha-case
类别
资金
- Air Force Summer Faculty Fellowship Program (AF SFFP) [FA9550-09-C-0114]
- Air Force Research Laboratory
This manuscript provides a new coupled thermo-chemo-mechanical computational model for titanium structures subjected to extreme loading and environment. The proposed model accounts for the formation of oxygen enriched (alpha-case) titanium, as well as the coupling effects between the response characteristics of mechanical and oxygen infiltration processes into titanium at high temperature environment. The formation of alpha-case at the surface of the structure is modeled as diffusion of oxygen into the titanium substrate. The mechanical response of the structure is idealized using the Johnson-Cook model, which is generalized to account for the effects of oxygen induced embrittlement and hardening. The interplay between mechanical damage, oxygen infiltration and temperature on the chemo-mechanical response is evaluated using numerical simulations. The fully coupled mechanical and diffusion processes are solved based on a staggered coupling algorithm. The capabilities of the computational model are assessed by the analysis of a panel composed of Ti-6Al-2Sn-4Zr-2Mo titanium alloy subjected to thermal shock loading. (C) 2010 Elsevier Ltd. All rights reserved.
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