A Zener-Stroh crack near an interface

✍ Scribed by H. Fan; Z.M. Xiao

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 760 KB
• Volume: 34
• Category: Article
• ISSN: 0020-7683
• DOI: 10.1016/s0020-7683(96)00196-5

✦ Synopsis

A micro crack can be initiated by coalescing dislocations piled up along a slip plane. This mechanism was firstly proposed by Zener and later on analyzed by Stroh. The micro crack is thus called Zener-Stroh crack, which is a counterpart of the well-known Griffith crack in linear elastic fracture mechanics. In the present paper, we consider a Zener-Stroh crack initiated near a bi-material interface. Due to image force acted on the dislocations, a Griffith crack mechanism is introduced even where the crack is purely loaded by net dislocations. It is seen that the stress intensity factor, which consists of a Zener-Stroh component and a Griffith component, and the critical crack length are strongly affected by the presence of the interface. ,o 1997 Elsevier Science Ltd.