About the Stress Strain Calculator
What is the Stress Strain Calculator?
Under a pulling or pushing force, a member carries stress (force per area) and stretches or shortens by a strain (change in length ÷ original length). This stress and strain calculator works out both.
Their ratio in the elastic range is Young's modulus, a measure of stiffness.
How to use the Stress Strain Calculator
- Axial Force (kN) (sample: 50)
- Cross-Sectional Area (mm²) (sample: 200)
- Original Length (mm) (sample: 1,000)
- Change in Length (mm) (sample: 1.25)
- Press Calculate Stress & Strain (results also refresh as you type). The result card shows the Stress, along with Strain, Strain in microstrain, Young's modulus (stress ÷ strain) and Reference.
Formula used
Stress σ = F ÷ A; Strain ε = ΔL ÷ L; E = σ ÷ ε
- Units = 1 N/mm² = 1 MPa
The relationship is linear only up to the elastic limit.
Worked example
These are the sample values already filled in the calculator above, and the result it returns for them:
| Input | Sample value |
|---|---|
| Axial Force (kN) | 50 |
| Cross-Sectional Area (mm²) | 200 |
| Original Length (mm) | 1,000 |
| Change in Length (mm) | 1.25 |
| Result | Value |
|---|---|
| Stress | 250 MPa |
| Strain | 0.00125 |
| Strain in microstrain | 1,250 µε |
| Young's modulus (stress ÷ strain) | 200 GPa |
| Reference | Mild steel E ≈ 200 GPa (yield about 250 MPa); aluminium ≈ 70 GPa; M25 concrete ≈ 25 GPa |
Tips for using the Stress Strain Calculator
- Keep working stresses well below yield: for Fe 250 steel, yield is 250 MPa.
- Strain gauges measure microstrain – one millionth of a unit strain.