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eng.metal-forming-spring-back Calculator
Calculates spring-back angle and final bend angle after sheet metal forming from material properties and tooling geometry. Spring-back in high-strength steel is 3–5× greater than in mild steel — progressive die tooling over-bends to compensate for the predicted spring-back.
Inputs
Bend Radius Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Material Thickness Mm
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Yield Strength Mpa
Stress at which permanent deformation begins. Design loads should stay below this — apply a safety factor of 1.5–3×.
Youngs Modulus Gpa
Reference formula or conversion factor shown for context.
Results
spring-back factor Rf/Ri
A dimensionless multiplier applied in the calculation.
spring-back angular correction (°)
Sample size or count used in the calculation.
R/t ratio
The proportional relationship between two quantities.
Rf/Ri = 1 - 3(σy/E)(R/t) + 4(σy·R/(E·t))³
Reference formula or conversion factor shown for context.
high-strength steel
Sample size or count used in the calculation.
practice
Reference formula or conversion factor shown for context.