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Charpy test sample with a notch. In mechanical engineering and materials science, a notch refers to a V-shaped, U-shaped, or semi-circular defect deliberately introduced into a planar material. In structural components, a notch causes a stress concentration which can result in the initiation and growth of fatigue cracks.
Sometimes the goal is merely the notch itself, but usually this is a precursor to some other process: such as bending a corner in sheet or joining two tubes at a tee joint, notching one to fit closely to the other. Notching is a low-cost process, particularly for its low tooling costs with a small range of standard punches.
Particularly rugged and forbidding cols in the terrain are usually referred to as notches. They are generally unsuitable as mountain passes, but are occasionally crossed by mule tracks or climbers' routes. Derived from the French col ("collar, neck") from Latin collum, "neck", [2] the term tends to be associated more with mountain than hill ...
nock (equipment) – The notch at the rear end of an arrow; also the notches at the ends of the bow limbs to which the bowstring is attached, or looped over; nock (practice) – The act of setting an arrow in a bow; nocking point (equipment) – The point on a bow string over which an arrow nock is placed
Glass cutter, showing hardened steel cutting wheel (far left), notches for snapping, and ball (on end of handle) for tapping. A glass cutter is a tool used to make a shallow score in one surface of a piece of glass (normally a flat one) that is to be broken in two pieces, for example to fit a window.
A dictionary with thumb indexes (on the right). A thumb index, also called a cut-in index [1] or an index notch, [2] is a round cut-out in the pages of dictionaries, encyclopedias, Bibles and other large religious books, and various sectioned, often alphabetic, reference works, used to locate entries starting at a particular letter or section.
Notch may refer to: Notch (engineering), an indentation or slit in a material; Nock (arrow), notch in the rearmost end of an arrow; Markus Persson (born 1979), a Swedish video game designer known by his online alias "Notch" Notch (musician) (born 1973), a hip hop, R&B, reggae, dancehall and reggaeton artist
In a bow and arrow, two notches near the bow's respective ends, for attaching the bowstring Nock (arrow) , in an arrow, the notch in the fletched (feathered) end of the arrow, for engaging the bowstring