65% copper and 35% zinc. Also known as High Brass. A copper-zinc alloy, named for its yellow hue. Formerly a very popular alloy, but now largely replaced by Cartridge Brass.
The first stress in a material less than the maximum obtainable stess at which an increase in strain occurs without an increase in stress. Also known as upper yield stress.
The first stress in a material, usually less than the maximum attainable stress, at which an increase in strain occurs without an increase in stress. Only certain metals exhibit a yield point. If there is a decrease in stress after yielding, a distinction may be made between upper and lower yield points.
The load per unit of original cross section at which, in soft steel, a marked increase in deformation occurs without increase in load.
The stress at which a material exhibits a specified deviation from propertionality of stress and strain. An offset of 0.2% is used for many metals.
The stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain. The deviation is expressed in terms of strain. Also known as proof stress.
The coefficient of elasticity of stretching. For a stretched wire, Young’s Modulus is the ratio of the stretching force per unit cross-sectional area to the elongation per unit length. The values of Young’s Modulus for metals are of the order 10(12) dynes per square cm.
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