Application of Dynamic Fracture Mechanics Concepts to Composites
Annual rept. 1 Jun 98-31 May 99
NOTRE DAME UNIV IN DEPT OF AEROSPACE AND MECHANICAL ENGINEERING
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The report is divided into five chapters covering new analytical solutions for dynamic cracks in orthotropic composites. Each chapter stands alone and has been submitted, accepted or prepared for publication in a refereed journal. First, closed form solutions for uniformly loaded semi-infinite cracks in orthotropic materials are presented. Next, solutions regarding the stress intensity factor at the tip of propagating cracks in orthotropic materials are presented. In addition, closed form, dynamic Greens functions solutions are given for semi-infinite cracks in orthotropic materials. Previously, in last years report, numerical Greens function solutions were presented for this case the first time. These newer, closed form solutions are much easier to produce and implement in more complex solutions. The problem of having a crack in transversely isotropic material rotated with respect to the crack front is also solved with some effort. The methodology used in finding all these solutions may be used in other problems including penetration mechanics. Such applications are currently being explored. Finally, experimental investigation of the application of these solutions to dynamic crack initiation in composites under impact conditions is being completed.
- Laminates and Composite Materials