Elastic interaction between screw dislocations and a blunting interfacial crack

Sheng Long Lee, Wen shinn Huang, Sham Tsong Shiue

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Using the conformal mapping technique, the elastic interaction between a screw dislocation and an interfacial crack emanating from a semielliptic hole is investigated. We have derived the complex potential, the stress field, the strain energy, the force on the dislocation, the stress intensity factor at the crack tip, the critical stress intensity factor KD for dislocation emission and the critical stress intensity factor Kc for brittle fracture. From the image force, we find that there are zero-force points near the surface of the semielliptic hole if the applied stress is sufficiently large. The ductile vs. brittle behaviour of two-phase material can be determined by the relative magnitudes of D and Kc. A two-phase material with a larger shear modulus ratio and sharp crack will be more brittle. Finally, our results can be reduced to several special cases.

Original languageEnglish
Pages (from-to)41-50
Number of pages10
JournalMaterials Science and Engineering A
Volume142
Issue number1
DOIs
StatePublished - 15 Aug 1991

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