Standard No.:	GB/T 228.1-2010
Chinese Name:	金属材料 拉伸试验 第1部分：室温试验方法
English Name:	Metallic materials - Tensile testing - Part 1 : Method of test at room temperature
Professional Classification:	H22 Metal mechanical property test method
ICS Classification:	77.040.10 Mechanical testing of metals
Issued by:
Issued on:	2010-12-23
Implemented on:	2011-12-01
Status:	VALID
Replace:	GB/T228-2002 Metallic materials--Tensile testing at ambient temperature
Language:	English
File Format:	PDF
Word Count:	36000 words
Price(USD):	1080 (USD)
Delivery:	via email in 1-8 business day

1 Scope

This part of GB/T 228 specifies the principle, definition, symbols, explanation, test piece and dimensional measurement, testing equipment, testing requirements, performance determination, the numerical rounding of determination results and testing report of the method for tensile testing of metallic materials.
This Part applies the determination of tensile performance of metallic materials at room temperature.
Note: Annex A indicates complementary recommendations for computer controlled testing machines.

2 Normative References

The following referenced document is indispensable for the application of this document. For dated references, only the edition cited applies. For the undated references, the latest edition of the referenced document (including all the amendments) applies.
GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test Piece for mechanical testing (GB/T 2975-1998, eqv ISO 377: 1997)
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10623 Metallic material - Mechanical testing - Vocabulary (GB/T 10623-2008, ISO 23718:2007, MOD)
GB/T 12160 Calibration of Extensometers Used in Uniaxial Testing (GB/T 12160-2002, ISO 9513: 1999, IDT)
GB/T 16825 Verification of Static Uniaxial Testing Machines - Part 1: Tension/ Compression Testing Machines -Verification and Calibration of the Force-measuring System (GB/T 16825.1-2008, ISO 7500-1: 2004 IDT)
GB/T 17600.1 Steel-Conversion of Elongation Values - Part 1: Carbon and Low Alloy Steels (GB/T 17600.1-1998, eqv ISO 2566-1: 1984)
GB/T 22066 Evaluation for Computerized Data Acquisition Systems for Used in Static Uniaxial Testing Machines

3 Terms and Definitions.

The following terms and definitions as well as those in GB/T 10623 are applicable to this Part.
3.1 Gauge length
L
The length of the circular column or prism part of the sample in measurement of the elongation.
3.1.1 Original gauge length
Lo
Length between gauge length marks on the piece measured at room temperature before the exertion of forces
3.1.2 Final, gauge length after fracture
Lu
Length between gauge length 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
Lc
Length of the parallel reduced section of the test piece.
Note: 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 at any moment during the test
3 .4 Percentage elongation
Elongation expressed as a percentage of the original gauge length [1].
3.4.1 Percentage of permanent elongation
Increase in the original gauge length Lo 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 (Lu-Lo) expressed as a percentage of the original gauge length (Lo) [1].