AS 2291:2020 pdf Metallic materials — Tensile testing — Method of test at elevated temperature
1 Scope
This document specifies a method of tensile testing of metallic materials at temperatures higher than room temperature.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:Tension/compression testing machines — Calibration and verification 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 terms and definitions given in ISO 6892-1 apply with the
following exceptions and supplements.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
In general, all test piece geometries/dimensions are based on measurements taken at room temperature.
The exception may be the extensometer gauge length (see 3.3 and 10.2.2).
NOTE The following properties are generally not determined at elevated temperature unless required by relevant specifications or agreement:
— permanent set strength (R r );
— percentage permanent elongation;
— percentage permanent extension;
— percentage yield point extension (A e );
— percentage total extension at maximum force (A gt );
— percentage plastic extension at maximum force (A g );
— percentage total extension at fracture (A t ).
3.1 original gauge length
gauge length measured at room temperature before heating of the test piece and before
application of force
3.2 percentage elongation after fracture
permanent elongation at room temperature of the gauge length after fracture (L u − L o )
Note 1 to entry: It is expressed as a percentage of the original gauge length (L o ) (3.1).
Note 2 to entry: For further details, see ISO 6892-1.
3.3 extensometer gauge length
length within the parallel portion of the test piece used for the measurement of extension (3.4) by means of an extensometer
3.4 extension
increase in the extensometer gauge length (L e ) (3.3) at a given moment during the test
3.5 percentage extension
extension (3.4) expressed as a percentage of the extensometer gauge length (L e ) (3.3)
3.6 percentage reduction of area
maximum change in cross-sectional area which has occurred during the test (S o − S u )
Note 1 to entry: It is expressed as a percentage of the original cross-sectional area (S o ), where S o and S u are calculated from the dimensions at room temperature.
3.7 stress
force at any moment during the test divided by the original cross-sectional area (S o ) of the test piece
Note 1 to entry: All stresses referred to in this document are engineering stresses, calculated using the cross-sectional area of the test piece derived from dimensions measured at room temperature.
3.8 soaking time
time taken to stabilize the temperature of the test piece prior to mechanical loading
4 Symbols and designations
ISO 6892-1 provides an extensive listing of symbols and their related designations.
The additional symbols used in this document are given in Table 1.
5 Principle
The test involves straining a test piece by tensile force for the determination of one or more of the
mechanical properties defined in Clause 3.
The test is carried out at a temperature higher than 35 °C, which means at temperatures higher than
room temperature as specified in ISO 6892-1.
6 Test piece
For requirements concerning test pieces, see ISO 6892-1.
NOTE Additional examples of test pieces are given in Annex A.
7 Determination of original cross-sectional area (S o )
For requirements concerning determination of the original cross-sectional area, see ISO 6892-1.
NOTE This parameter is calculated from measurements taken at room temperature.
8 Marking the original gauge length (L o )
For requirements concerning marking the original gauge length, see ISO 6892-1.
AS 2291:2020 pdf Metallic materials — Tensile testing — Method of test at elevated temperature
