Elastic strain is reversible under certain conditions from "summary" of Stress and Strain by Winthrop Dickinson Means
When a material is subjected to external forces, it may undergo deformation. This deformation can be either elastic or plastic in nature. Elastic deformation occurs when the material is able to return to its original shape and size once the external forces are removed. On the other hand, plastic deformation results in permanent changes in the material's shape and size. Elastic strain, as the name suggests, is reversible under certain conditions. This means that when a material is under the influence of external forces causing elastic deformation, it will return to its original shape and size once those forces are removed. This property of elastic strain is what allows materials like rubber bands to stretch and then snap back into place. The reversibility of elastic strain is dependent on the material's ability to store and release energy as the external forces are applied and removed. When the material is deformed elastically, it stores energy in the form of potential energy. This energy is then released when the external forces are removed, allowing the material to return to its original state. However, it is important to note that the reversibility of elastic strain is not indefinite. There are certain conditions under which the material will not be able to return to its original shape and size. For example, if the external forces applied to the material exceed its elastic limit, the material will undergo plastic deformation and will not be able to return to its original state.- Elastic strain is reversible under certain conditions due to the material's ability to store and release energy as external forces are applied and removed. This property of materials allows them to deform elastically and return to their original shape and size, provided that the forces applied do not exceed the material's elastic limit.
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