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infinite sing islocation lo ce) is indica n picture s rve. S.

infinite sing islocation lo ce) is indica n picture s rve. S.

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Consider an infinite single crystal with a dislocation loop. In the top picture, the dislocation loop (only ¼ is shown since we only illustrate a quarter space) is indicated by the thin dashed curve. The plan view in the bottom picture shows the complete dislocation loop by the thick dark curve. Please note the positive direction of the dislocation loop is ABA*, and the Burgers vector is in x2 direction, as drawn near letter B and letter C in the top. X2 (1) If the solid is subjected to a shear stress as shown in the top picture, please schematically illustrate the evolution of the dislocation loop. Justify your answer. (2) Using the Peach-Koehler force, F = (T.b)x5, derive the В X1 force acting on a small segment of dislocation at B and on a small segment of dislocation at A A B*
Transcribed Image Text:Consider an infinite single crystal with a dislocation loop. In the top picture, the dislocation loop (only ¼ is shown since we only illustrate a quarter space) is indicated by the thin dashed curve. The plan view in the bottom picture shows the complete dislocation loop by the thick dark curve. Please note the positive direction of the dislocation loop is ABA*, and the Burgers vector is in x2 direction, as drawn near letter B and letter C in the top. X2 (1) If the solid is subjected to a shear stress as shown in the top picture, please schematically illustrate the evolution of the dislocation loop. Justify your answer. (2) Using the Peach-Koehler force, F = (T.b)x5, derive the В X1 force acting on a small segment of dislocation at B and on a small segment of dislocation at A A B*
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