Knife edge

A knife edge is the thin, sharpened region of a blade that performs cutting by concentrating force over a small contact area.

Cutting: The separation of material by applying force through a tool or other means. A knife edge cuts by concentrating force to initiate and extend a separation.
Blade: The flat or curved part of a cutting tool that carries its cutting edge. The knife edge is the blade's sharpened boundary.
Chef's knife: A broad kitchen knife designed for chopping, slicing, and other food preparation tasks. Its relatively long edge supports varied cutting motions in food preparation.
Bluntness: The condition of a cutting edge that has lost the geometry needed to cut effectively. A blunt edge requires more force because it does not concentrate stress as effectively.
Wedge: A simple machine with a sloping surface that converts applied force into forces that separate materials. A knife edge acts as a wedge driven into the material being cut.
Steel: An iron-based alloy containing carbon, often with other alloying elements. Many knife edges are made from steel because it can combine hardness and toughness.
Razor: A tool with a very thin edge designed to cut hair close to the skin. Its fine edge illustrates the low cutting force achievable with a thin apex.
Edge retention: A cutting edge's ability to maintain useful sharpness during use. It describes how long a knife edge remains effective before requiring maintenance.
Edge angle: The angle formed by the converging faces of a blade near its cutting edge. It affects sharpness, strength, and the force needed to cut.
Hardness: A material's resistance to localized deformation, scratching, or indentation. Hardness helps an edge resist deformation during cutting.

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