Stress & Strain Calculator

Calculate engineering stress, strain and an implied secant modulus for a uniform member under axial load.

Use consistent measurements from one uniform tensile or compressive member. The modulus result is meaningful only in the linear-elastic range.

Engineering stress (σ)100 MPa14.504 ksi
Engineering strain (ε)0.00050.05%
Secant modulus (σ / ε)200 GPa29,007.6 ksi

Important: this reports engineering stress and strain only. It does not check yield, ultimate strength, buckling, fatigue, stress concentration, bending, shear, connections or material nonlinearity.

Method

Engineering stress is σ = F / A and engineering strain is ε = ΔL / L0. Dividing stress by strain gives a secant modulus for the stated measurements.

Worked example

A 10 kN force on a 100 mm² bar gives 100 MPa stress. If a 1,000 mm gauge length extends 0.5 mm, strain is 0.0005 (0.05%) and the implied secant modulus is 200 GPa.

Important limits

This is not a structural-design check. It assumes uniform axial loading and uses engineering, rather than true, stress and strain. Verify material data, yield, buckling, fatigue, connections and the applicable design code separately.

References

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