什么是 Strain Calculator？
Calculate engineering strain with this free strain calculator. Find axial strain ε = ΔL/L₀, shear strain γ = δ/h, elastic strain from Hooke's law ε = σ/E, thermal strain ε = αΔT, and lateral Poisson strain ε_lat = −ν·ε_axial. Results in dimensionless strain, microstrain (με), and percent. Metric and imperial units with material presets for E, α, and ν. Runs instantly in your browser.
如何使用 Strain Calculator
- Choose axial, shear, Hooke's law, thermal, or Poisson strain mode.
- Select metric or imperial units.
- Enter deformation dimensions, stress and modulus, thermal α and ΔT, or axial strain and ν.
- Optionally enter original length for thermal ΔL or lateral dimension for width change.
- Review ε, microstrain, percent strain, and calculation steps.
常见用例
- Converting tensile test elongation to engineering strain
- Elastic strain from known stress and steel modulus
- Thermal expansion strain for a bridge or rail temperature swing
- Lateral contraction from axial load using Poisson's ratio
- Materials homework on ε, γ, and Hooke's law
常见问题
- What is engineering strain?
- Engineering (Cauchy) strain ε = ΔL/L₀ is the change in length divided by the original length. It is dimensionless; multiply by 10⁶ for microstrain (με) as used on strain gauges.
- How does Hooke's law relate stress and strain?
- In the elastic range, ε = σ/E where E is Young's modulus. Doubling stress doubles strain until the proportional limit is exceeded.
- What is thermal strain?
- Materials expand when heated: ε_thermal = α × ΔT, where α is the coefficient of thermal expansion. Enter α in ×10⁻⁶ per °C or °F to match your temperature units.
- What is Poisson's ratio?
- When a bar stretches axially, it usually contracts laterally. Poisson's ratio ν links them: ε_lateral = −ν × ε_axial. Steel is about 0.3; rubber approaches 0.5.
- What is microstrain?
- Microstrain με = ε × 10⁶. A strain of 0.001 equals 1000 με — a typical value for structural steel near yield.
