SHEET METAL CAM & FLAT PATTERN ENGINEERING

Sheet Metal Corner Relief & Notch Calculator

Compute corner tear relief notch geometry (circular, teardrop, rectangular, obround), minimum notch radius (R ≥ Ri + T), stress concentration reduction, and unfolded flat blank DXF parameters.

1. Material & Thickness

Material Alloy

Sheet Metal Thickness (T) [mm]

Nominal material thickness (0.5 mm - 10.0 mm).

Inside Bend Radius (Ri) [mm]

Internal radius formed by punch tip (typically 1.0T to 2.0T).

2. Corner & Notch Geometry

Relief Notch Style

Flange 1 Height (H1) [mm]

Flange 2 Height (H2) [mm]

Corner Relief Dimensions & Verification

Min Relief Diameter (Dr)

4.00 mm

R_min = Ri + T rule

Notch Setback Depth

3.41 mm

Beyond tangent intersection

Stress Concentration (Kt)

1.15

Ratio vs baseline crack threshold

Post-Bend Corner Gap

0.60 mm

Clearance between folded lips

FLAT BLANK CORNER NOTCH DXF PROFILE:

CAD Relief Formula:

                            R_relief ≥ Inside_Radius + Sheet_Thickness
                        

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