The Quarterly Journal of Mechanics and Applied Mathematics Advance Access published online on April 27, 2007
The Quarterly Journal of Mechanics and Applied Mathematics, doi:10.1093/qjmam/hbm008
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DYNAMIC CRACK-TIP SINGULAR STRESS IN A CYLINDRICALLY ORTHOTROPIC ELASTIC SOLID

( Mathematics & Computer Science, Adelphi University, Garden City, NY 11530, USA )
( Mechanical Engineering, Yamagata University, Yonezawa, Yamagata 992, Japan )
payton{at}panther.adelphi.edu
Received 25 September 2006.
Revise 5 March 2007.
| Abstract |
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Anti-plane wave motion is induced in a cylindrically orthotropic elastic solid containing a semi-infinite stress-free crack, by a point impulsive body force. First, the static version of the problem is solved for the fracture stress 
z. Here, a global solution is obtained and then examined at the crack tip in order to determine the nature of the spatial singularity. Next, the dynamic problem is treated and it is found that the dominant spatial singularity for 
z at the crack tip is the same as in the static case. However, the dynamic part of the stress intensity factor, T, may introduce a further singularity. Several equivalent expressions are presented for T, one of which is examined in some detail.