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 strain is crucial in understanding the behavior of materials under stress. Elastic materials can withstand a certain amount of deformation without causing permanent damage, making them suitable for applications where flexibility is required. On the other hand, plastic materials undergo permanent deformation under stress, which can be advantageous in certain applications where shape modification is desired. The ability of a material to exhibit either elastic or plastic strain depends on its intrinsic properties, such as its composition, structure, and mechanical properties. Understanding the behavior of materials under stress and strain is essential in various fields, including engineering, materials science, and physics. By studying how materials respond to external forces, researchers can develop new materials with specific characteristics tailored to different applications.
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