Elasticity

1 min read Updated Fri Apr 24 2026 03:19:45 GMT+0000 (Coordinated Universal Time)

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