Screw dislocations interacting with two asymmetrical interfacial cracks emanating from an elliptical hole  

Screw dislocations interacting with two asymmetrical interfacial cracks emanating from an elliptical hole

在线阅读下载全文

作  者:曾鑫 方棋洪 刘又文 P. H. Wen 

机构地区:[1]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body , Hunan University [2]College of Mechanical and Vehicle Engineering, Hunan University [3]School of Engineering and Material Sciences, Queen Mary, University of London

出  处:《Chinese Physics B》2013年第1期356-362,共7页中国物理B(英文版)

基  金:Project supported by the National Natural Science Foundation of China (Grant Nos. 11172094 and 11172095);the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-11-0122);the Science Fund of State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, China (Grant Nos. 61075005 and 51075001);the Fundamental Research Funds for the Central Universities (Hunan University), China

摘  要:The interaction between screw dislocations and two asymmetrical interfacial cracks emanating from an elliptic hole under loads at infinity is studied. The closed-form solution is derived for complex potentials. The stress intensity factor and the critical applied stress for the dislocation emission are also calculated. In the limiting cases, well-known results can be obtained from the present solutions. Moreover, new exact solutions for a screw dislocation interacting with some complicated cracks are derived. The results show that the shielding effect increases with the increase in the length of the other cracks and the minor semi axis, but decreases with the increase of dislocation azimuth. The repulsion acting on the dislocation from the other phase and the other crack extend in the horizontal direction, which makes the dislocation emission at the crack tip take place more easily, but the minor semi axis of the elliptical hole extending in the vertical direction makes it more difficult.The interaction between screw dislocations and two asymmetrical interfacial cracks emanating from an elliptic hole under loads at infinity is studied. The closed-form solution is derived for complex potentials. The stress intensity factor and the critical applied stress for the dislocation emission are also calculated. In the limiting cases, well-known results can be obtained from the present solutions. Moreover, new exact solutions for a screw dislocation interacting with some complicated cracks are derived. The results show that the shielding effect increases with the increase in the length of the other cracks and the minor semi axis, but decreases with the increase of dislocation azimuth. The repulsion acting on the dislocation from the other phase and the other crack extend in the horizontal direction, which makes the dislocation emission at the crack tip take place more easily, but the minor semi axis of the elliptical hole extending in the vertical direction makes it more difficult.

关 键 词:interfacial crack elliptic hole shielding effect dislocation emission 

分 类 号:O346.1[理学—固体力学] TB33[理学—力学]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象