GOST R ISO 10113-2014

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  ГОСТ Р ИСО 10113-2014

GOST R ISO 10113−2014 Materials metal. Sheets and strips. Determination of the coefficient of plastic deformation

GOST R ISO 10113−2014
Group B09

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

THE METAL MATERIALS. SHEETS AND STRIPS

Determination of the coefficient of plastic deformation

Metallic materials. Sheets and strips. Determination of plastic strain ratio

OKS 77.040.10
AXTU 0709

Date of introduction 2015−01−01

Preface

1 PREPARED by the Federal state unitary enterprise «Central scientific research Institute im.And.P.Bardeen» based on authentic translation into the Russian language of the international standard indicated in paragraph 4 is FSUE «STANDARTINFORM"

2 SUBMITTED by the Technical Committee for standardization TC 145 «monitoring Methods of steel products"

3 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology of June 11, 2014 N 649-St

4 this standard is identical with ISO 10113:2006* «the metal Materials. Sheets and strips. Determination of the coefficient of plastic deformation» (ISO 10113:2006 «Metallic materials — Sheet and strip — Determination of plastic strain ratio»).
________________
* Access to international and foreign documents referred to here and hereinafter, can be obtained by clicking on the link to the site shop.cntd.ru. — Note the manufacturer’s database.

In applying this standard it is recommended to use instead of the referenced international standards corresponding national standards of the Russian Federation and interstate standards, details of which are given in Appendix YES

5 INTRODUCED FOR THE FIRST TIME

Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) reference index «National standards» and the official text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the upcoming issue of the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet (gost.ru)

Introduction

ISO (international organization for standardization) is a worldwide Federation composed of national standards bodies (committees — members of ISO). The development of international standards, as a rule, is conducted in technical committees of ISO. Each Committee member interested in the topic for which was formed this technical Committee has the right to be represented in the Committee. International organizations, governmental and non-governmental that support the communication with ISO, also take part in its work. ISO collaborates closely with the International electrotechnical Commission (IEEC) on all questions of standardization in the field of electrical engineering.

International standards are drafted in accordance with the rules given in part 2 of the ISO/IEC Directives.

The main purpose of technical committees is to prepare international standards. International standards adopted by technical committees are circulated to the member bodies for voting. For publication international standard is required to collect at least 75% positive votes of committees ' members participating in the vote.

Attention is drawn to the fact that certain elements of this standard may be the subject of patent rights. ISO is not responsible for identifying any or all such patent rights.

10113 developed by ISO Technical Committee ISO/TC 164 «Mechanical testing of metals», Subcommittee SC 2 «ductility Testing».

This second edition cancels and replaces the first edition (ISO 10113:1991), which was revised in technical terms. This corrected version of ISO 10113:2006 includes the following changes:

in 3.1 the definition was updated and the previous note entered into the note 2;

in 3.2 and 3.3 was added a second index for level of deformation. The previous footnotewas introduced as Annex 2;

in table 1 the corrections to the legend and descriptions are given plastic deformation, plastic deformation coefficient, the average values and the slope of the plastic part of the curve of percentage of elongation from tension;

— 9.2 the indefinite article «a» (English) was removed from the second line between the words «For» and «better»;

— fixes legend was made in equation (5) and equation (7);

— figures 1 and 2 with the appropriate symbols have been modified.

1 Scope

This standard specifies a method for the determination of the plastic deformation of flat steel (thin sheet and strip) made of metallic materials.

2 Normative references

This standard uses the regulatory references to the following standards:
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* The table of conformity of national standards international see the link. — Note the manufacturer’s database.


ISO 6892:1998 metallic Materials. Tensile test at ambient temperature (ISO 6892:1998, Metallic materials — Tensile testing at ambient temperature)

ISO 9513:1999 metallic Materials. Calibration of extensometers used in uniaxial testing (ISO 9513:1999, Metallic materials — Calibration of extensometers used in uniaxial testing)

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 the coefficient of plastic deformation (plastic strain ratio), : the Ratio of true plastic strain in width to true plastic strain in thickness in the specimen to be tested, which has undergone a uniaxial tensile stress

, (1)

where is the true plastic strain in thickness;

 — true plastic strain in width.

Notes

1 the Above expression using a single point, valid only in the region where the plastic deformation is homogeneous.

2 Because it is easier and more accurate to determine the changes in thickness than in length, the following relation is derived from the law of constancy of volume, used for plastic elongation in percent at maximum power , to calculate plastic deformation .


For some materials, which are characterized by a phase change during plastic deformation, the volume of the measured profile cannot always be taken for constant. In such cases, the method should be determined and agreed upon by stakeholders.

. (2)

Note — Because the value depends on the orientation of the sample for the test relative to the direction of rolling, and the level of deformation, the symbol may be supplemented with the angle that characterizes the orientation and the level of deformation. For example, (table 1).


3.2 weighted average plastic strain ratio (weighted average plastic strain ratio), : average value for different orientations of the sample, calculated through the equation

. (3)

Notes

If 1 is defined , all tests shall be carried out in the same range of strain/deformation.

2 In respect of some of materials can be selected different orientation of the sample, in this case, should be used equations different from equation (3).


3.3 the degree of planar anisotropy (degree of planar anisotropy), the value calculated by the formula

. (4)

Notes

If 1 is defined , all tests shall be carried out in the same range of strain/deformation.

2 In respect of some of materials can be selected different orientation of the sample, in this case, should be used equations different from equation (4).

4 legend

Symbols and names used in this standard are given in table 1.


Table 1 — symbols and names

5 the essence of the method

The sample is subjected to a tensile test to a specified level of plastic deformation and the plastic deformation coefficient is calculated from measurements of changes in length and width. The orientation of the sample relative to the direction of rolling and the level of plastic deformation for which the values determined are in agreement the corresponding standard of the product. As a rule, the level of deformation must be below the plastic elongation at maximum force.

6 Test equipment

Used tensile testing machine shall conform to the requirements of ISO 6892.

For hand method, a device measuring changes in the baseline length should have a measurement accuracy within ±0.01 mm. the Device used to measure changes in base width shall have measurement accuracy to ±0.005 mm.

In relation to the automatic method (section 8) should be used extensometers defined in ISO 9513:1999, class 1 or higher.

Note — When applying large base length and considerable elongation, the maximum relative error of the extensometer of class 1 can be more than ±0,01 vols.


Capture method the sample for test shall conform to ISO 6892.

7 Sample for test

7.1 the Sample for test shall be selected in accordance with the requirements of the relevant standard for the product or, if absent, by agreement between the parties concerned.

Type of sample for test and its preparation, including the tolerances, the tolerances on the shape and markings of the original base length, shall conform to the definitions given in ISO 6892:1998, Annex a, however, within the basic length of the edge should be sufficiently parallel to the two width measurements did not differ more than 0.1% of the average value of all measurements of width.

7.2 the thickness of the sample must be in the full thickness sheet, unless otherwise specified.

7.3 the sample Surface must not be damaged, e.g., scratches.

8 Methodology

8.1 the Test shall be carried out at ambient temperature, i.e. between 10 °C and 35 °C. Testing under controlled conditions, where required, is carried out at a temperature of (23±5)°C.

8.2 If the measurement is carried out manually, the initial width of the sample should be determined at least at three points distributed over the base length, including one measurement at each end of the base length. The average of these width measurements should be used in the calculation of the coefficient of plastic deformation.

8.3 If the measurement is carried out in automatic mode, the length and changing width, at least one measurement point should be determined by using extensometer (section 6).

8.4 In the plastic range the straining rate of the parallel length shall not exceed 0.008/s.

8.5 Fasten the specimen in the clamps of the testing machine and, keeping the test speed within the limits specified in 8.4, are making the desired deformation:

a) either to achieve the level of plastic deformation established in the relevant standard for the product (manual);

b) or to determine the values of the width when the level of plastic strain is specified in the relevant product standard (automatic determination).

8.6 In the case of manual determination, after removing the load, measure the base length and base width in the same way and to the same tolerances specified for the original base length and width.

8.7 In the case of automatically determining the measuring the length and width for a given level of plastic deformation should be carried out using the extensometer in accordance with section 6.

8.8 If the specimen has a transverse bending (figure 1), which can affect the test results, the test is considered invalid and repeat.

Figure 1 — Schematic representation of the transverse bending in the cross section of the sample for test

1 — transverse bending

Figure 1 — Schematic representation of the transverse bending in the cross section of the sample for test

8.9 If plastic deformation is not homogeneous, manual definition of values is impossible. Having continuously read data width changes relative to the extension and using the statistical methods described in 9.2, you can define a reproducible value.

8.10 In the case of coated material such as galvanized or organic coatings obtained r-values can differ from the values of the basic material without coating

9 Expression of results

9.1 In respect of manual procedure calculate the coefficient of plastic deformation, the average ratio of plastic strain for different orientations of the sample and the degree of planar anisotropy using equation (2), (3) and (4). When used equations different from (3) and (4), this should be stated in the test report.

9.2 In respect of materials with homogeneous nature of the deformation method can be used individual sample points. With the aim of increasing the reproducibility to be used a certain range.

For the materials with inhomogeneous character of deformation can be used the following method to obtain reproducible results.

The true plastic strain along the length must be calculated according to the formula

. (5)

The true plastic strain in width should be calculated according to the formula

, (6)

where is the Poisson’s ratio (e.g., 0.30 for steel; of 0.33 for aluminum).

Plastic deformation (at a given moment during the test) shall be calculated by the formula

. (7)

Regarding explanations see figure 2.

Figure 2 — the Relationship between true plastic strain and true width of the plastic deformation along the length of the

Note — Attention! The upper and lower limits are expressed in plastic (technical) deformation;  — axis expresses the true plastic strains along the length.


 — true plastic deformation in length ;

 — true plastic strain in width ;

1 — the lower limit: e.g. 8% of the plastic (technical) strain (equivalent true plastic strain 0,077);

2 — upper limit: for example, 12% plastic (technical) strain (equivalent true plastic strain 0,113);

3 — start;

4 — linear regression between the lower and upper limit through the beginning:

,

-0,39833,

0,662.

Figure 2 — the Relationship between true plastic strain and true width of the plastic deformation along the length of the

If you use the automatic method in equations (5) and (7) should be replaced .

In strict physical approach, to calculate the true plastic strains along the length , the true plastic strains in width and plastic strains in equations (5), (6) and (7) should be used true cross-sectional area calculated by the formula

, (8)

instead of the original cross sectional area . However, practice shows that the results obtained with or differ slightly. Hence, the original cross-sectional area can be used in equations (5), (6) and (7).

Linear regression of equation (6) with respect to equation (5) must be approximated in a given area through the beginning. The slope of this linear regression is equal to , value is determined by using the equation

. (9)

9.3 Computed values of the coefficient of plastic deformation shall be recorded to the nearest 0.05.

9.4 If there is a discrepancy between automatic and manual determination for the same sample, the assessment shall be the source of this discrepancy.

Note — the Discrepancy in the results of automatic and manual determination of values may be caused by inhomogeneous deformation.

10 test report

The test report shall include the following information:

a) reference to this standard;

b) identification of the tested material;

c) the method used (manual or automatic);

d) the type of the used sample for test;

e) the orientation of the sample for test relative to the direction of rolling;

f) the range of plastic deformation/plastic deformation, in which measurements were conducted, for example:

(a linear regression between 8% and 12% plastic deformation),

(method of individual sample points with a 10% plastic deformation);

g) the obtained results of the test;

h) the equation used to calculate , and if they are different from equations (3) and (4).

Annex a (informative). International comparison of symbols used in the determination of the coefficient of plastic deformation

Appendix A
(reference)

App YES (reference). Information about the compliance of the referenced international standards reference the national standards of the Russian Federation (and acting in this capacity inter-state standards)

App YES
(reference)

Table YES.1

Bibliography

The electronic text of the document
prepared by JSC «Code» and checked by:
the official publication of the
M.: STANDARTINFORM, 2014