STRAIN. A measure of the relative change in the size or shape of a body. Linear strain is the change per unit length of a linear dimension. True strain (or natural strain) is the natural logarithm of the ratio of the length at the moment of observation to the original gage length. Conventional strain is the linear strain over the original gage length. Shearing strain (or shear strain) is the change in angle (expressed in radians) between two lines originally in right angles. When the term “strain” is used alone it usually refers to the linear strain in the direction of applied stress.
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SHAKER-HEARTH FURNACE. A continuous type furnace that uses a reciprocating shaker motion to move the parts along the hearth.
SUPERHEATING. Heating above the temperature at which an equilibrium phase transformation should occur without actually obtaining the transformation.
SPRING TEMPER. A temper of nonferrous alloys and some ferrous alloys characterized by tensile strength and hardness about two-thirds of the way from […]
STRAIN HARDENING. An increase in hardness and strength caused by plastic deformation at temperatures below the recrystallization range.