MSE306Chap4Dislocations

MSE306Chap4Dislocations - Materials Structure At some...

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Materials Structure At some length scale, the assumption that materials may be represented as a “continuum” fails. In reality, materials are composed of atoms or molecules that are often arranged in a lattice (or crystal). Very frequently the materials we wish to describe are polycrystalline and multi- phase. Crystal lattices invariably contain defects: point, line and planar defects . Throughout the rest of the course it our understanding of material’s behavior will be in light of these structural aspects….
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Cleavage failure - normal stress perpendicular to the applied stress. Orowan - assumed no crack present and that all the atoms on the plane separate at once. a ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 ( 29 . produced. . energy surface to work equate d, distance the determine to E K 3 cos ... 2 ng substituti and 1 ating differenti and 2 elasticity isotropic assuming sin 1 0 0 0 0 0 0 0 a d E a a d d K a da d a a da d d d E a da d a a d K π = = -
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This note was uploaded on 11/24/2009 for the course MSE 306 taught by Professor Smith during the Spring '09 term at UVA.

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MSE306Chap4Dislocations - Materials Structure At some...

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