Elasticity

Deformation is temporary. Returns to its original shape when load is released.

Opposite to elasticity. Deformation is permanent.

Linear Elastic Materials

When elastic deformation portion in stress-strain diagram is a straight line.

Aka. alastic modulus. Can be thought of as stiffness.

\text{Young's modulus }E=\frac{\text{stress}}{\text{strain}}=\frac{\sigma}{\epsilon}

When elastic deformation portion in stress-strain diagram is not a straight line.

Equal to the tangent of the line connecting a point in the stress-strain diagram and the origin.

Equal to the instantaneous tangent on a point in the stress-strain diagram.

Types of modulus

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September 13, 2026 1 min read

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