An elastic wave scattering problem relating to the rapid movement of a fracture in a plate: Part II — Numerical results
✍ Scribed by Naresh Vasudevan
- Publisher
- Springer Netherlands
- Year
- 1990
- Tongue
- English
- Weight
- 603 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0374-3535
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✦ Synopsis
In Part I of this two part paper, we developed analytical expressions for the crack face displacements due to an applied point traction as well as a moving point source of dilatation. In this sequel to Part I, we present numerical results for the crack face displacements in the form of displacement-time records at fixed locations on the crack face. For the stationary point traction problem, the results are more or less in keeping with the predictions made in Part I, with the Rayleigh pulse giving a large contribution for an applied step load.
In the case of the moving point microfracture with a step time dependence, in addition to the diffracted compressional, shear and Rayleigh arrivals there is observed the evolution of a new pulse whose amplitude and position on the time record shifts changes if the calculations are done for a different crack speed. Results are also presented for a microfracture with an oscillatory time dependence. Once again, the first arrival of the surface pulse appears to be the most prominent arrival on the record. Further explorations of the parameters and source functions would be required before comparisons with experimental data can be made. * N. Vasudevan: An elastic wave scattering problem relating to the rapid movement of a fracture in a plate, Part I -Theory. J. Elasticity 22 (1989) 95-119.