eli5 How does razor blade dull on hairs when razor blades are made of steel and they are much higher on mohs scale?
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The Mohs hardness scale is not used by materials scientists and engineers and it not relevant to materials performance.
The tensile strength is a much more relevant property.
The tensile strength of a beard hair is around 150-270 MPa, while the tensile strength of steel is around 400-800MPa.
Due to geometrical factors, stress concentrator etc, beard hair could easily cause yielding and plastic deformation in a razor, dulling it.
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