EFFECT OF BOUNDARIES AND INTERFACES ON SHEAR-BAND LOCALIZATION
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The emergence of general stationary-wave solutions, exemplified by Rayleigh surface waves and Stoneley interface waves, is taken as a criterion for the onset of localization in the presence of geometrical features such as free boundaries and interfaces. The stationary-wave solutions yield the possible orientations of the emerging shear bands. The influence of interfaces in crystalline solids and of free boundaries in pressure-sensitive frictional materials is investigated within this general framework. It is found that grain boundaries in polycrystals can act as both barriers to, and as sources of, shear bands. The analysis of pressure-sensitive frictional materials reveals a mismatch in orientation between the shear bands in the interior and on the boundary of the solid. The implications of this misorientation for the global behavior of specimens tested in plane strain compression are discussed. 1991.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
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NEEDLEMAN, A., & ORTIZ, M.
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