MSE306Chap4Dislocations-2

MSE306Chap4Dislocations-2 - Burgers Circuit To determine...

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Burgers Circuit To determine the Burgers vector… Simple, confusing, important construct Requires convention (FS/RH) Perhaps confusing because answer is not absolute, depends upon convention Important for determining reactions to applied stresses and dislocation-dislocation interactions
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Burgers Circuit May be taken about 0, one, or many dislocations.
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Edge, Screw, Mixed Edge – Burgers vector, b , is perpendicular to line vector Screw - Burgers vector, b , is parallel to line vector, t or ξ Mixed – Burgers vector, b , is inclined to line vector, t or ξ Can be described in terms of edge and screw components Please review text for details
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b1 + b2 = b3; b3 – b4 = b5 What does this tell us about where dislocations lines can end? *** What about dislocation reactions? Continuity very important concept! often confuses students* Analogous to Kirchhoff’s law of current flow… Burgers vector of a dislocation (or collection of dislocations) is continuous Net Burgers vector equal on opposite sides of nodes b1 b2 b3 b4 b5 ?
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Generalities and Orders of Magnitude after Veyssière, in Mechanics and Materials
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MSE306Chap4Dislocations-2 - Burgers Circuit To determine...

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