Full definition
Reversible dimensional change in a material under load, proportional to stress per Hooke's Law (σ = E·ε). The material fully recovers its original shape upon load removal. Corresponds to the linear region of the stress-strain curve. Elastic modulus (E): steel ≈ 200 GPa, aluminum ≈ 70 GPa, copper ≈ 110 GPa, rubber ≈ 0.01-0.1 GPa.