A B C DE F G H I J K L M N O P Q R Sa-Sq St-Sy T U V W X Y Z
Permission ASM International Copyright © 2001 ASM International®. All Rights Reserved.
Y-block
A single keel block.
yellow brass
A name sometimes used in reference to the 65Cu-35Zn type of brass.
yield
(1) Evidence of plastic deformation in structural materials. Also known as plastic flow or creep. See also flow. (2) The ratio of the number of acceptable items produced in a production run to the total number that were attempted to be produced. (3) Comparison of casting weight to the total weight of metal poured into the mold.
yield point
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 materials–those that exhibit a localized, heterogeneous type of transition from elastic to plastic deformation–produce 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 at which a sudden drop in the flow curve occurs is called the upper yield point. The constant load shown on the flow curve is the lower yield point.
yield point elongation
In materials that exhibit a yield point, the difference between the elongation at the completion and at the start of discontinuous yield.
yield strength
The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An offset of 0.2% is used for many materials, particularly metals. Compare with tensile strength.
yield stress
The stress level of highly ductile materials at which large strains take place without further increase in stress.
Young’s modulus
A term used synonymously with modulus of elasticity. The ratio of tensile or compressive stresses to the resulting strain. See also modulus of elasticity.