AS 1391:2020 pdf Metallic materials — Tensile testing — Method of test at room temperature
1 Scope
This part of ISO 6892 specifies the method for tensile testing of metallic materials and defines the
mechanical properties which can be determined at room temperature.
NOTE Annex A contains further recommendations for computer controlled testing machines.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE In what follows, the designations “force” and “stress” or “extension”, “percentage extension”, and “strain”,respectively, are used on various occasions (as figure axis labels or in explanations for the determination of different properties). However, for a general description or point on a curve, the designations “force” and “stress” or “extension”, “percentage extension”, and “strain”, respectively, can be interchanged.
3.1 gauge length
length of the parallel portion of the test piece on which elongation is measured at any moment
during the test
3.1.1 original gauge length
length between gauge length (3.1) marks on the test piece measured at room temperature before the test
3.1.2 final gauge length after fracture
length between gauge length (3.1) marks on the test piece measured after rupture, at room temperature,the two pieces having been carefully fitted back together so that their axes lie in a straight line
3.2 parallel length
length of the parallel reduced section of the test piece
Note 1 to entry: The concept of parallel length is replaced by the concept of distance between grips for unmachined test pieces.
3.3 elongation
increase in the original gauge length (3.1.1) at any moment during the test
3.4 percentage elongation
elongation expressed as a percentage of the original gauge length (3.1.1)
3.4.1 percentage permanent elongation
increase in the original gauge length (3.1.1) of a test piece after removal of a specified stress, expressed as a percentage of the original gauge length
3.4.2 percentage elongation after fracture
A permanent elongation of the gauge length after fracture, (L u − L o ), expressed as a percentage of the original gauge length (3.1.1)
Note 1 to entry: For further information, see 8.1.
3.5 extensometer gauge length
initial extensometer gauge length used for measurement of extension by means of an extensometer
Note 1 to entry: For further information, see 8.3.
3.6 extension
increase in the extensometer gauge length (3.5), at any moment during the test
3.6.1 percentage extension
extension expressed as a percentage of the extensometer gauge length (3.5)
Note 1 to entry: e is commonly called engineering strain.
3.6.2 percentage permanent extension
increase in the extensometer gauge length, after removal of a specified stress from the test piece,
expressed as a percentage of the extensometer gauge length (3.5)
3.6.3 percentage yield point extension
in discontinuous yielding materials, the extension between the start of yielding and the start of uniform work-hardening, expressed as a percentage of the extensometer gauge length (3.5)
Note 1 to entry: See Figure 7.
3.6.4 percentage total extension at maximum force
total extension (elastic extension plus plastic extension) at maximum force, expressed as a percentage of the extensometer gauge length (3.5)
Note 1 to entry: See Figure 1.
AS 1391:2020 pdf Metallic materials — Tensile testing — Method of test at room temperature
