Stress field
Open-knowledge reference entry
A stress field is the distribution of internal forces in a body that balance a given set of external forces. Stress fields are widely used in fluid dynamics and materials science. Consider that one can picture the stress fields as the stress created by adding an extra half plane of atoms to a crystal. The bonds are stretched around the location of the dislocation and this stretching causes the stress field to form. Atomic bonds further and further away from the dislocation centre are less and less stretched which is why the stress field dissipates as the distance from the dislocation centre increases. Each dislocation within the material has a stress field associated with it. The creation of these stress fields is a result of the material trying to dissipate mechanical energy that is being exerted on the material. By convention, these dislocations are labelled as either positive or negative depending on whether the stress field of the dislocation is mostly compressive or tensile.
By modelling of dislocations and their stress fields as either a positive (compressive field) or negative (tensile field) charges, we can understand how dislocations interact with each other in the lattice. If two like fields come into contact with one another they will be repelled by one another.
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This entry incorporates text from “Stress field” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.