Elastic Strain Formula |
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\( \epsilon_e \;=\; \dfrac{ \sigma }{ E }\) (Elastic Strain) \( \sigma \;=\; \epsilon_e \cdot E \) \( E \;=\; \dfrac{ \sigma }{ \epsilon_e }\) |
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| Symbol | English | Metric |
| \( \epsilon_e \) (Greek symbol epsilon) = Elastic Strain | \(in \;/\; in\) | \(mm \;/\; mm\) |
| \( \sigma \) (Greek symbol sigma) = Stress | \(lbf \;/\; in^2\) | \(Pa\) |
| \( E \) = Young's Modulus | \(lbf \;/\; in^2\) | \(Pa\) |
Elastic strain, abbreviated as \( \epsilon_e \) (Greek symbol epsilon), is the portion of deformation that occurs in a material when a load or stress is applied and is fully reversible once the load is removed. In this strain, the material obeys Hooke’s law, meaning the strain is directly proportional to the applied stress, and the material returns to its original shape and dimensions after unloading. Elastic strain arises from the stretching or compression of atomic bonds without permanently changing the material’s internal structure. This type of strain occurs up to the material’s elastic limit or yield point and is typical of normal operating conditions for most structural components.
