The Crack Growth Behavior in electrolyte membrane under Mechanical-electrochemical Loading
As the key component of SOFC (solid oxide fuel cell),a theoretical framework has been built to illustrate the coupling effect between oxygen vacancy concentration and stress field in early works.Here,the coupling theory is expanded and more affecting factors are taken into consideration.An electrolyte membrane with a macro crack is studied by a modified multi-scale method under fully coupling effect.It can be observed that the crack propagates with the increase of remote loadings,and the fracture mode is brittle fracture.The local stress concentration at the crack tip influences significantly the electromechanical fields and the fracture toughness of the stoichiometric sample (Ce0.8Gd0.2O1.9) may be reduced from 0.9493MPa?m1/2 of uncoupled value to 0.5142MPa?m1/2.It can be concluded that the coupling effect is important for the electrolyte in the working environment; especially in the case of the existence of a crack.
electrolyte membrane mechanical-electrochemical coupling multi-scale simuation fracture toughness
Yun J Chen Yi Sun Yi Z Liu Chen Wang
Department of Astronautic Science and Mechanics,Harbin Institute of Technology,Harbin 150001,PR China
国际会议
北京
英文
1-8
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）