13th International Conference on Fracture June 16-21, 2013, Beijing, China deformation mechanism. (i) σxx (ii) σyy (a)model 1 (i) σxx (ii) σyy (a)model 2 (i) σxx (ii) σyy (a)model 3 Figure 4. Kink deformation expressed using discrete dislocations 3.2.3. Dislocation Dipoles on Slip Planes under Loading Figure 5 shows the stress distribution σxx on deformed body for three dislocation dipoles on 3-slip plane model under both compression and shear loading. According to the comparison between (i) linear elasticity and (ii) hyper-elasticity models, deformed shape of specimens are similar to each other, but there appears some difference both qualitatively and quantitatively. (i) linear elasticity model (ii) hyper-elasticity model Figure 5. Distribution of stress σxx on deformed body under compression- shearing test The stress contour for the linear elasticity model is simply recognized by the superposition of intrinsic stress field of dislocations and their image field, and external loading of compression and shearing. On the other hand, the typical bending stress due to the deformed shape of specimen can be observed in the shape of stress contour for the hyper-elasticity model. -6-
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