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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27149


    Title: ELASTIC INTERACTION BETWEEN SCREW DISLOCATIONS AND A BLUNTING INTERFACIAL CRACK
    Authors: LEE,SL;HUANG,WS;SHIUE,ST
    Contributors: 機械工程學系
    Keywords: FREE ZONE MODEL;WELDED SURFACE CRACK;FRACTURE;DUCTILE;TIP
    Date: 1991
    Issue Date: 2010-06-29 18:09:00 (UTC+8)
    Publisher: 中央大學
    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 K(D) for dislocation emission and the critical stress intensity factor K(c) 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 K(D) and K(c). 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.
    Relation: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
    Appears in Collections:[機械工程研究所] 期刊論文

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