BS EN ISO 6892-2:2018 pdf free.Metallic materials – Tensile testing – Part2:Method of test at elevated temperature.
In this document, two methods of testing speeds are described. The first, Method A, is based on strain rates (including crosshead separation rate) with narrow tolerances (±20 %) and the second, Method B, is based on conventional strain rate ranges and tolerances. Method A is intended to minimize the variation of the test rates during the moment when strain rate-sensitive parameters are determined and to minimize the measurement uncertainty of the test results.
The influence of the testing speed on the mechanical properties, determined by the tensile test, is normally greater at an elevated temperature than at room temperature.
Traditionally, mechanical properties determined by tensile tests at elevated temperatures have been determined at a slower strain or stressing rate than at room temperature. This document recommends the use of slow strain rates but, in addition, higher strain rates are permitted for particular applications, such as comparison with room temperature properties at the same strain rate.
During discussions concerning the speed of testing in the preparation of this document, it was decided to consider deleting the stress rate method in future revisions.
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.
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 (So)
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.