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Abstract:
It is increasingly being recognized that the stress and displacement fields near the tip of a crack are essentially three dimensional in nature. Exact analytical solutions for the three-dimensional crack problem, however, do not exist in general. Thus, finite-elements have been used extensively to gain an understanding of the three dimensional structure of the crack tip fields. The finite-element method has also been used to study three dimensional dynamic fracture problems. For the most part, however, special singular elements have been used to model the crack tip. The purpose of employing singular elements has been bias the near tip field to have a particular (asymptotically known) structure in order to extract the magnitude of crack tip singularities (the stress intensity factor, J-integral, et cetera).
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Pages: |
46 |
| Report Date: |
DEC 88 |
| Contract Number: |
N00014-85-J-0596 |
| Report Number: |
A765342 |
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