Strain can be elastic or plastic, depending on the material from "summary" of Stress and Strain by Winthrop Dickinson Means
When a material is subjected to an external force, it undergoes deformation, which is characterized by strain. This strain can either be elastic or plastic, depending on the material being tested. In the case of elastic strain, the material deforms under the applied force but returns to its original shape once the force is removed. This means that the material can recover its initial dimensions after being deformed. Elastic strain is reversible and does not result in any permanent changes to the material. On the other hand, plastic strain occurs when the material deforms under the applied force and does not return to its original shape once the force is removed. This type of strain results in permanent deformation of the material. Plastic strain is irreversible and leads to changes in the material's shape and properties. The distinction between elastic and plastic strai...
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