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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TRANSGRANULAR CRACKING. Cracking or fracturing that occurs through or across a crystal or grains. Also called transcrystalline cracking.
ULTIMATE STRENGTH. The maximum conventional stress (tensile, compressive or shear) that a material can withstand.
SOLUTION HEAT TREATMENT. Heating an alloy to a suitable temperature, holding at that temperature long enough to cause one or more constituents to […]
TOUGHNESS. The ability of a metal to absorb energy and deform plastically before fracturing.