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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There was a scientific study on this subject a few years ago and they found out that microstructures and the angle of cut drives the process of dulling the blade edge.
When a razorblade slices through a hair that is fixed to the skin, the hair bends away from the blade – thus changing the cutting angle. At some angles, the blade is subject to a large shear force that is perpendicular to the sharp edge. The team believe this causes the deformation and chipping of the blade
[https://physicsworld.com/a/bending-hairs-and-compliant-microstructures-make-razor-blades-dull/](https://physicsworld.com/a/bending-hairs-and-compliant-microstructures-make-razor-blades-dull/)
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