If the dislocations are in the right alignment with respect to each other, the local stress fields they create will repel each other.
42.
The creation of these stress fields are a result of the material trying to dissipate mechanical energy that is being exerted on the material.
43.
The general work theorem establishes an energy relationship between any statically-admissible stress field and any kinematically-admissible strain field that can be defined in the body.
44.
By convention these dislocations are labeled as either positive or negative depending on whether the stress field of the dislocation is mostly compressive or tensile.
45.
Dislocations may be pinned due to stress field interactions with other dislocations and solute particles, creating physical barriers from second phase precipitates forming along grain boundaries.
46.
All tectonic plates have internal stress fields caused by their interactions with neighboring plates and sedimentary loading or unloading ( e . g . deglaciation ).
47.
The NW-SE orientation of the maximum horizontal stress derived from the observed focal mechanism is at a high angle to the regional stress field for North America.
48.
Thus, the contact zone between sample and the end plates does not buildup unnecessary shear friction, and a linear / isotropic stress field within the specimen is sustained.
49.
By modeling of dislocations and their stress fields as either a positive ( tensile field ) charges we can understand how dislocations interact with each other in the lattice.
50.
Dislocation propagation is impeded because of the stress field of the grain boundary defect region and the lack of slip planes and slip directions and overall alignment across the boundaries.
