An Evaluation of Several Moving Singularity Finite Element Models for Fast Fracture Analysis.
Abstract
Comparison of the propagation-eigen-function element, the stationary-eigen-function element, and the quarter-point isoparametric element in terms of accuracy and efficiency leads to several conclusions. The two eigen-function elements showed similar accuracy at all crack speeds up to 0.6Cs while the isoparametric element model started showing significant differences between 0.2Cs and 0.4Cs. While the quarter-point isoparametric elements were the least expensive to use (approx. 2/3 the cost of the stationary-eigen-function element and approx. 1/2 that of the propagation-eigen-function element) their sensitivity to crack speed and the need to use indirect methods to obtain K sub I reduce their initial attractiveness. Another conclusion to be drawn from the comparison of the models is that the stationary-eigen-function element has all the attractive features of the propagation eigen-function element without the disadvantage of non-symmetric stiffness matrices. Also, because the matrices are not crack speed dependent, they do not need to be recomputed each time crack speed changes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1981
- Accession Number
- ADA103075
Entities
People
- R. B. Stonesifer
- S. N. Atluri
- T. Nishioka
Organizations
- Georgia Tech