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dc.contributor.authorLin, KMen_US
dc.contributor.authorLin, HCen_US
dc.contributor.authorChen, KCen_US
dc.contributor.authorChang, HLen_US
dc.date.accessioned2014-12-08T15:01:54Z-
dc.date.available2014-12-08T15:01:54Z-
dc.date.issued1997-03-31en_US
dc.identifier.issn0921-5093en_US
dc.identifier.urihttp://hdl.handle.net/11536/655-
dc.description.abstractThe behaviour of a screw dislocation around a circular surface crack was analyzed using the conformal mapping method. The effects of the crack length l and its radius of curvature R on the shielding effect and the strain energy were discussed in detail. It was found that for a dislocation being fixed at a constant distance from the crack tip and located on a plane tangent to crack surface at the tip, there exists a critical crack length l* corresponding to a maximum shielding effect induced by the dislocation on the circular surface crack. The l* increases with R and approaches infinity as the crack becomes planar (i.e. R --> infinity). The shielding effect vanishes as the crack disappears. It increases rapidly with l if 0 < l much less than l*, regardless of R. After reaching the maximum, it decreases slightly for larger R but significantly for smaller R as the crack becomes longer. The shielding is more pronounced for larger R than that for smaller R, with the difference increasing with crack length. As a result, a surface microcrack propagates initially in a rather brittle manner then becomes more ductile. When the crack gets longer, it still keeps ductile for a less curved or a planar crack but becomes relatively brittle for a severely curved crack. In addition, the strain energy is also significantly influenced by crack length and increases rapidly with l when l is rather small, regardless of R. With increasing l, it becomes less affected by l, and the variation with R is still not obvious, with larger R corresponding to a slightly higher strain energy. (C) 1997 Elsevier Science S.A.en_US
dc.language.isoen_USen_US
dc.subjectscrew dislocationsen_US
dc.subjectcircular surface cracksen_US
dc.subjectelastic interactionen_US
dc.subjectconformal mapping methoden_US
dc.titleElastic interaction between screw dislocations and a circular surface cracken_US
dc.typeArticleen_US
dc.identifier.journalMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSINGen_US
dc.citation.volume224en_US
dc.citation.issue1-2en_US
dc.citation.spage216en_US
dc.citation.epage220en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
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