Elastodynamic near-tip fields for a rapidly propagating interface crack

J. D. Achenbach*, Z. P. Bažant, R. P. Khetan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The elastodynamic stress field near a crack tip rapidly propagating along the interface between two dissimilar isotropic elastic solids is investigated. Both anti-plane and in-plane motions are considered. The anti-plane displacements and the in-plane displacement potentials are sought in the separated forms rqF(θ), r and θ being polar coordinates centered at the moving tip. The mathematical statement of the problem reduces to a second-order linear ordinary differential equation in θ, which can be solved analytically. Formulation of the boundary and interface conditions leads to an eigenvalue problem for the singularity exponent q. For the in-plane problem, root q is found to be complex. Thus, the stresses exhibit violent oscillations within a small region around the crack tip, and the solutions have physical significance only outside this region. The angular stress distributions are plotted for various crack speeds, and it is found that at a high enough speeds the direction θ of maximum stress moves out of the interface. This result indicates that a running interface crack may move into one of the adjoining materials.

Original languageEnglish (US)
Pages (from-to)797-809
Number of pages13
JournalInternational Journal of Engineering Science
Issue number9
StatePublished - 1976

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Mechanics of Materials
  • Mechanical Engineering


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