MANUFACTURING – HEET METAL & FORMING CALCULATOR
Notch Relief Corner
A precise tool.
What is the Notch Relief Corner & How does it work?
A notch relief is a small cutβout placed at the interior corner of a sheetβmetal bend. It prevents tearing and excessive thinning when the material is forced around a tight radius, especially in highβstress applications. The size of the relief depends primarily on the sheet thickness, the bend angle, and the bend radius. Thicker material and sharper angles require larger reliefs to keep the neutral axis from stretching beyond its elastic limit. For a corner bend the most common empirical expression is: This formula balances material stretch with the geometry of the bend, giving a practical starting point for design.
N = frac{t left(1 – sinleft(theta/2right)right)}{cosleft(theta/2right)}
N = notch relief size (mm)
t = material thickness (mm)
ΞΈ = bend angle (degrees)
t = material thickness (mm)
ΞΈ = bend angle (degrees)
Parameters
Result
β
Frequently Asked Questions
What is a notch relief in sheet metal?
A notch relief is a small cut-out at the interior corner of a bend to prevent tearing and excessive thinning when material is forced around a tight radius.
How does the size of the notch relief depend?
The size depends on sheet thickness, bend angle, and bend radius. Thicker material and sharper angles require larger reliefs.
Why is a notch relief important in manufacturing?
It prevents tearing and excessive thinning of the material, especially in high-stress applications where the neutral axis must not stretch beyond its elastic limit.
What is the most common empirical expression for corner bends?
The description does not provide a specific expression, but it mentions that it is the most common empirical method used.
Can you explain how to calculate the notch relief size?
While an exact formula isn’t provided, it generally considers the material thickness, bend angle, and radius. Thicker materials or sharper bends require larger reliefs.
Results are for informational purposes only and do not constitute professional advice.