Metallic materials—Calibration and verification of static uniaxial testing machines—Part1:Tension/compression testing machines—Calibration and verification of the force-measuring system
GB/T 16825.1:2022 Metallic materials - Calibration and verification of static uniaxial testing machines Part 1: Tension/compression testing machines - Calibration and verification of the force-measuring system
1 Scope
This document specifies the calibration and verification of tension/compression testing machines.
The verification consists of:
——a general inspection of the testing machine, including its accessories for the force application;
——a calibration of the force-measuring system of the testing machine;
——a confirmation that the performance properties of the testing machine achieve the limits given for a specified class.
This document applies to the calibration and inspection of force measurement systems for tensile and/or compression testing machines.
Note: This document addresses the static calibration and verification of the force-measuring systems. The calibration values are not necessarily valid for high-speed or dynamic testing applications. Further information regarding dynamic effects is given in the Bibliography.
CAUTION——Some of the tests specified in this document involve the use of processes which can lead to a hazardous situation.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
ISO 376 Metallic materials - Calibration of force-proving instruments used for the verification of uniaxial testing machines
Note: GB/T 13634-2019 Metallic materials - Calibration of force-proving instruments used for the verification of uniaxial testing machines (ISO 376:2011, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
calibration
operation that establishes the relationship between the force values (with associated uncertainties) indicated by the testing machine and those measured by one or more force-proving instruments
3.2
verification
confirmation, based on analysis of measurements in accordance with this document, that the performance properties of the testing machine achieve the limits given for a specified class
4 Symbols
Symbols and their meanings are given in Table 1.
Table 1 Symbols and meanings
Foreword I
Introduction III
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 General inspection of the testing machine
6 Calibration of the force-measuring system of the testing machine
6.1 General
6.2 Determination of the resolution
6.2.1 Analogue scale
6.2.2 Digital scale
6.2.3 Variation of readings
6.2.4 Unit
6.3 Prior determination of the relative resolution of the force indicator
6.4 Calibration procedure
6.4.1 Alignment of the force-proving instrument
6.4.2 Temperature compensation
6.4.3 Conditioning of the testing machine and force-proving instrument
6.4.4 Procedure
6.4.5 Application of discrete forces
6.4.6 Verification of accessories
6.4.7 Verification of the effect of differences in piston positions
6.4.8 Determination of relative reversibility error
6.5 Assessment of the force indicator
6.5.1 Relative indication error
6.5.2 Relative repeatability error
6.5.3 Agreement between two force-proving instruments
7 Class of testing machine range
8 Verification report
8.1 General information
8.2 Results of verification
9 Intervals between verifications
Annex A (Nominative) General inspection of the testing machine
