Protective Sportswear
The standard is written for a snapped blade, not a button. Halve the tip radius and a third of the resistance goes with it.
— N
Force the construction withstands against the specified tip
Layers are treated as adding linearly, which flatters a real stack: loosely assembled layers slip and share load poorly, and the second layer rarely contributes its full share. This is also a quasi-static model and a lunge is dynamic, with the blade arriving at speed against a moving body — the standard test method exists precisely because that combination is not predictable from fabric properties. Layers needed is returned as a fraction and must be rounded up to a whole layer. **This is a decision-support estimate only.** Fencing protective equipment is life-safety equipment governed by FIE and national federation standards, and conformity can only be established by certified testing of the finished garment.
Fencing Plastron Puncture Resistance & Safety Margin — free, with the formula and a worked example, at Textile School.