NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
53rd NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
Session ID : 1F5
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Consideration on Dislocation Behavior in Surface-Layer
*TATSURO MORITA
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Abstract
This study was conducted to consider the behavior of dislocations in materials with surface-layers. For this purpose, we investigated the values of the force due to the externally applied stress and the image force acting on a screw dislocation in the semi-infinite elastic body with the surface-layer whose shear modulus is different from that of the substrate. The image force was derived using the concept of image dislocations. The result of the analysis predicted that the shear modulus lower than that of the substrate is desirable for the surface-layer to suppress the movement of dislocations escaping from the surface without the increase in the possibility of fracture of the surface-layer due to the generation of high stress in the layer.
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© 2004 Committee for Mechanics and Structure,Science Council
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