Micromechanics analyses of interface crack |
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Authors: | Wang Tzuchiang |
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Institution: | (1) LNM, Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | A new mechanics model based on Peierls concept is presented in this paper, which can clearly characterize the intrinsic features
near a tip of an interfacial crack. The stress and displacement fields are calculated under general combined tensile and shear
loadings. The near tip stress fields show some oscillatory behaviors but without any singularity and the crack faces open
completely without any overlapping when remote tensile loading is comparable with remote shear loading. A fracture criterion
for predicting interface toughness has been also proposed, which takes into account for the shielding effects of emitted dislocations.
The theoretical toughness curve gives excellent prediction, as compared with the existing experiment data.
The project supported by the National Natural Science Foundation of China |
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Keywords: | micromechanics interface crack toughness |
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