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    National Tsing Hua University Institutional Repository > 工學院  > 材料科學工程學系 > 期刊論文 >  Comparison of the effects of dislocations around internal and surface cracks on fracture

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/62108

    Title: Comparison of the effects of dislocations around internal and surface cracks on fracture
    Authors: K.M. Lin;C.T. Hu;Sanboh Lee
    教師: 李三保
    Date: 1987
    Publisher: Elsevier
    Relation: Materials Science and Engineering,Volume 95,November 1987,Pages 167-174
    Keywords: dislocations around internal
    surface cracks
    Abstract: By comparing the results of internal cracks obtained by Louat with those on surface cracks obtained by Juang and Lee, we find that the physical variables of an internal crack of length 21 are equivalent to the counterparts of a surface crack of length l. If the dislocation is not very close to the free surface, the magnitude of each physical variable of the surface crack is between those of counterparts of the internal crack with the number m of dislocations inside the crack equalling — 1 and 0. For short cracks, each physical variable is proportional to m. As a result, an internal microcrack appears in the region containing this dislocation. In contrast, for long cracks, we compared the first-order terms for both cracks, and the zero-order terms were found to be the same as those of a semi-infinite crack. Finally, the validity of the action-reaction law is proved for both types of crack.
    URI: http://www.elsevier.com/wps/find/homepage.cws_home
    Appears in Collections:[材料科學工程學系] 期刊論文

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