GB/T 5027-2016 PDF in English
GB/T 5027-2016 (GB/T5027-2016, GBT 5027-2016, GBT5027-2016)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 5027-2016 | English | 170 |
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Metallic materials -- Sheet and strip -- Determination of plastic strain ratio
| Valid |
| GB/T 5027-2007 | English | 359 |
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Metallic materials -- Sheet and strip -- Determination of plastic strain ratio
| Obsolete |
| GB/T 5027-1999 | English | 319 |
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Metallic materials-Sheet and strip--Determination of plastic strain ratio (r-values)
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| GB/T 5027-1985 | English | RFQ |
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Metallic sheets--Plastic strain ratio (gama-values) test method
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Standards related to (historical): GB/T 5027-2016
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GB/T 5027-2016: PDF in English (GBT 5027-2016) GB/T 5027-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.10
H 22
Replacing GB/T 5027-2007
Metallic materials - Sheet and strip - Determination of
plastic strain ratio
(ISO 10113.2006, MOD)
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. NOVEMBER 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Symbols and descriptions... 7
5 Principle... 8
6 Test equipment... 8
7 Specimen... 8
8 Test procedures... 9
9 Data processing... 10
10 Test report... 13
Bibliography... 14
Metallic materials - Sheet and strip - Determination of
plastic strain ratio
1 Scope
This Standard specifies the method for determining the plastic strain ratio of metal
sheets and strips.
This Standard applies to materials that are uniformly plastically deformed (that is, the
part of the stress-strain curve in the range of plastic deformation that increases
monotonically and continuously). It is also not applicable to the materials with non-
uniform plastic deformation (that is, the part of the stress-strain curve in the range of
plastic deformation that has a discontinuous shape such as sawtooth).
2 Normative references
The following referenced documents are indispensable for the application of this
Standard. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1-2010, Metallic materials - Tensile testing - Part 1.Method of test at
room temperature (ISO 6892-1.2009, MOD)
GB/T 12160-2002, Calibration of extensometers used in uniaxial testing (ISO
9513.1999, IDT)
3 Terms and definitions
For the purposes of this Standard, the following terms and definitions apply.
3.1 plastic strain ratio; r
Under the action of uniaxial tensile stress, the ratio of the true plastic strain in the width
direction and the true plastic strain in the thickness direction of the specimen is shown
in formula (1).
Where,
5 Principle
Conduct the tensile test on the specimen. Test for changes in length and width at
specified plastic strain levels. Calculate the plastic strain ratio value r. The sampling
direction of the specimen relative to the rolling direction and the level of plastic
(engineering) strain for testing the r value are specified by the relevant product standard.
As a guideline, the strain level shall be above the yield extension stage and below the
amount of plastic (engineering) strain at the maximum force.
6 Test equipment
6.1 The tensile testing machine shall meet the requirements of GB/T 228.1-2010 for
equipment.
6.2 The resolution of the device for measuring the gauge length of the sample shall be
better than 0.01mm. For manual measurement, the resolution of the device for
measuring the width shall be better than 0.005mm.
6.3 Use automatic measurement methods. The extensometer shall meet the
requirements for Grade 1 in GB/T 12160-2002 or be better than Grade 1.
NOTE. When using long gauge lengths and large elongations, the length error measured by a Grade
1 extensometer may exceed ±0.01mm.
6.4 The clamping method of the specimen shall be in accordance with the provisions of
GB/T 228.1-2010.
7 Specimen
7.1 Sampling shall be in accordance with relevant product standards. If the product
standard is not specified, sampling is according to the agreement of the parties
concerned.
7.2 Specimen type and specimen preparation, including dimensional tolerances, shape
tolerances, and original gauge length markings, shall comply with the provisions of
Annex B of GB/T 228.1-2010.In addition, it is also required that the two sides of the
specimen shall be sufficiently parallel within the gauge length range, so as to ensure
that the difference between any two width measurements is less than 0.1% of the
average width measurement.
7.3 Except for special requirements, the thickness of the specimen is the thickness of
the test plate.
7.4 There shall be no damage such as scratches on the surface of the specimen.
8 Test procedures
8.1 The test is generally carried out at room temperature of 10℃~35℃. When it is
required to conduct the test under controlled temperature conditions, the temperature
shall be controlled at (23±5)℃.
8.2 If manual measurement is used, the original width of at least 3 points must be
measured at equal intervals within the gauge length of a specimen, including one
measurement at each end of the gauge length. The average of these widths is used to
calculate the plastic strain ratio.
8.3 If automatic measurement is used, the length extension and the width change at the
at least one point shall be measured using an extensometer that conforms to the
provisions of Clause 6.
8.4 During the plastic deformation stage, the strain rate shall not exceed 0.008/s.
8.5 Clamp the specimen in the tester chuck. Keep the test speed within the speed range
specified in 8.4.Make the desired transformation.
a) Meet the plastic (engineering) strain levels specified in the relevant product
standards;
b) Measure the length and width within the gauge length of the specimen or within
the gauge length of the extensometer at the level of plastic (engineering) strain
specified in the relevant product standard.
8.6 The test is invalid if the specimen exhibits transverse bending that affects the test
results (see Figure 1). The test shall be reconducted.
8.7 If the plastic strain is not uniform, manual determination of the r value cannot be
performed. Use the continuously measured length extension and corresponding width
change data. Apply the statistical methods specified in 9.2.Reproducible r values can
be calculated.
8.8 Coated materials (such as galvanized or organic coatings) may have different r
values than uncoated base materials.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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