Engineering Strain
Engineering Strain
Strain is the fractional change in length — the deformation measure paired with stress in every material test.
The engineering strain is ε = ΔL/L_0. where ΔL is the change in length and L_0 the original length.
Inputs
dL := 0.6 mm=0.6 mm
L_0 := 200 mm=200 mm
Divide extension by original length.
eps := dL/L_0=3e-03
Results
Strain is dimensionless (often given as a percentage or microstrain). Paired with stress it gives the modulus and reveals the material’s stiffness.
Assumptions & limitations
- Small (engineering) strain.
- Uniform gauge length.
- Based on original length.