This standard defines the terminology that is used in mechanical testing of metallic materials and forms a common basis for standards and general use.
2 General Terms
2.1
crack growth
Δα
crack extension
change in crack length
Note: It is expressed in millimetres (mm).
2.2
fracture toughness crack length
α length of crack measured from load line to crack tip in the CT specimen, from the perpendicular bisector of the central crack to crack tips in the MT specimen, and from the specimen front face to crack tip in the bend specimen
2.3
fatigue crack length
crack size
α a linear measure of a principal planar dimension of a crack from a reference plane to the crack tip
Note: It is expressed in millimetres (mm).
2.4
ductility
ability of a material to deform plastically without fracturing
2.5
elastic limit
maximum stress that a material is capable of sustaining without any permanent strain remaining upon complete release of the stress
