This standard specifies the principle, test instrument, specimen, test procedure, test results and test report for testing the hardness of reinforced plastics using a Barcol hardness tester. This standard is applicable to the determination of the Barcol hardness of reinforced plastics and their products. The determination of the Barcol hardness of non-reinforced plastics and their products can also be referred to for implementation, but it is not applicable to materials with a Barcol hardness of less than 20. GB/T 3854-2005 Barcol hardness test method for fiber reinforced plastics GB/T3854-2005 standard download decompression password: www.bzxz.net

ICS83.120
National Standard of the People's Republic of China
GB/T3854—2005
Replaces GB/T3854--1983
Test method for hardness of reinforced plastics by means of a Barcol impresserPromulgated on 2005-05-18
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaAdministration of Standardization of the People's Republic of China
Implementation on 2005-12-01
GB/T 3854—2005
This standard is modified to adopt ASTMD2583-95 (2001 re-approved) Test method for hardness of reinforced plastics by means of a Barcol impresser\ (English version).
The main differences between this standard and ASTM D2583-95 are: - The (Y7J935 Barcol hardness tester was discarded, and the domestic HBa-1 Barcol hardness tester was added; Figure 1 in ASTM D2583-95 was omitted
.. Chapter 14 of ASTM D2583-95 \ Precisian and Bias " was not adopted, and the method of finding the arithmetic mean, standard deviation and coefficient of dispersion was used for error analysis.
This standard replaces GB/T 3854-1983 "Fiber Reinforced Plastic Barcol (Barcol) Hardness Test Method". Compared with GB/T 3854-1983, the main changes of this standard are as follows: The Barcol hardness test method was changed to "Barcol hardness test method for reinforced plastics" and the term "Barcol hardness (meter)" was used, and the common name of "Barcol hardness (meter)" was abandoned; a chapter on scope was added (see Chapter 1); a chapter on normative references was added (see Chapter 2); the appendix of the original standard was written into the main text, and Figure A1 in the original Appendix A was omitted (the appendix of the 1983 edition, Chapter 4 of this edition); the number of tests adopted the provisions of Table 1 of ASTMD2583-95 (Chapter 6 of the 1983 edition, Chapter 8 of this edition). This standard was proposed by the China Building Materials Industry Association. This standard is under the jurisdiction of the National Technical Committee for Standardization of Fiber Reinforced Plastics. The main drafting units of this standard: East China University of Science and Technology: The main drafters of this standard: Hu Fuzeng, Gan Shuzhong, Cao Qixiong, Wei Dafu, Lu Hong, Guan Yong. This standard was first issued in 1983, and this is the first subscription. 1 Scope
Reinforced plastic Barcol hardness test method
GB/T3854—2005
This standard specifies the principle, test instrument, specimen, test procedure, test results and test report for testing the hardness of reinforced plastics with a Barcol hardness tester.
This standard is applicable to the determination of the Barcol hardness of reinforced plastics and their products. The Barcol hardness determination of non-reinforced plastics and their products can also be implemented as a reference, but it is not applicable to materials with a Barcol hardness of less than 20. 2 Normative documents
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T1446--2005 General principles for test methods for properties of fiber reinforced plastics 3 Principle
Barcol hardness is an indentation hardness, which uses a specific indenter to press into the specimen under the pressure of a standard push load spring, and characterizes the hardness of the specimen by the depth of the indentation.
4 Test instrument
4. 1 Test instrument
HBa-1 Barcol hardness tester or GYZJ934-1 Barcol hardness tester, the schematic diagram of its structure is shown in Figure 1. 2
Indicator,
Spindle:
Two screws for cutting load
Load adjustment spring
Full-scale adjustment screw;
Key nut;
Indenter!
One foot. bZxz.net
Figure 1 Schematic diagram of the structure of the Chen Kerr hardness tester
GB/T 3854—2005
4.2 Indenter
The indenter is a truncated cone made of high-temperature steel, with a cone angle of 26\ and a flat surface diameter of 0.157mm at the top. It fits in a full-scale adjustment screw hole and is pressed by a spindle loaded by a spring. 4.3 Indicator
The dial of the indicator head has 10 divisions, and each division is equivalent to a depth of 0.0076 mm. When the pressure depth is 0.76 mm, the gauge reading is zero; when the pressure depth is zero, the gauge reading is 100. The higher the reading, the harder the material. 5 Specimen
5.1 The surface of the specimen should be smooth and flat, without defects and mechanical damage. 5.2 The thickness of the specimen should not be less than 1.5 mm. The size of the specimen should meet the requirement that the distance from the pressure point to the edge of the specimen and between the pressure points should not be less than 3 mm.
6 Test Case
According to the provisions of Chapter 3 of GB/T1446-2005. 7 Test Procedure
7.1 Instrument Accuracy
7.1.1 Full Scale Calibration
Check whether the pointer of the indicator is pointing to the mold point. If it is within one grid, it can be adjusted. Place the hardness tester on the flat glass! ：, apply pressure to the housing, so that the pressure head is forced to return to the full scale adjustment screw hole. At this time, the meter head reading should be 100, that is, full scale.
If the full scale is not 100, it must be adjusted. Open the housing, loosen the locking nut at the bottom, and turn the full scale adjustment screw. Loosen the meter head indication value to decrease, tighten the meter head indication value to increase, until the full scale meets 100. 7. 1.2 Value calibration
After full scale calibration, test the two high and low standard hardness sheets attached to the hardness tester (note that the side engraved with the standard value must be used). The measured reading is within the range of the hardness sheet marked value. If the value does not match the marked value, you can rotate the load adjustment screw with a cross slot. When tightening, the indication value decreases, and when loosening, the indication value increases. After the indication value is adjusted, there is no need to re-check the full scale deviation. For a hardness tester with a broken or damaged pressure head, satisfactory results cannot be obtained. At this time, the pressure head must be replaced. 7.1.3 Replacement of the indenter
The length of the indenter is related to the dimensional chain of the entire measuring disc system. When the indenter is damaged, it cannot be ground and reused, and can only be replaced with the spare parts attached to the instrument. When replacing the indenter, first open the H case, loosen the locking nut of the lower Hao, remove the adjustment screw, take out the old indenter, and install the new indenter. Be careful not to let the spindle and load spring bounce with the eye. After replacing the indenter, the hardness tester must be recalibrated for full scale and indication. 7.2 Test steps
7.2.1 Place the sample on a hard and stable support surface (such as steel plate, glass plate, cement platform, etc.). For curved surface samples, care should be taken to prevent bending and deformation that may be caused by the test pressure. 7.2.2 Place the indenter sleeve vertically on the surface of the sample to be tested. The support feet are placed on the same surface or other solid materials with the same height. Grip the hardness tester housing and quickly apply pressure downward until the reading on the scale reaches the maximum value. Record the maximum reading (because some materials will have readings that drift from the maximum value, and the reading has a nonlinear relationship with time). This value is the Barcol hardness value. Note that when the indenter contacts the surface to be tested, sliding and scratching should be avoided. 8 Test times
For reinforced plastics, when the hardness is greater than or equal to 60, 10 tests are required; when the hardness is less than 60, the test times are obtained from Table 1. For non-reinforced plastics, when the hardness is greater than or equal to 60, 5 tests are required; when the hardness is less than 60, the test times are obtained from Table 1. Barcol hardness
9 Test results
Non-reinforced plastics
9.1 Single test value: 123,
Table 1 Recommended number of Barcol hardness tests
Minimum number of tests
Barcol hardness
The arithmetic mean of a group of test values ​​is calculated according to formula (1) and rounded to an integer 9.2
Where:
~The arithmetic mean of a group of test values,
Single test value;
Number of tests.
9. 3Standard deviation s is calculated according to formula (2) and rounded to two significant figures ( )
Standard deviation!
9.4 The coefficient of dispersion Cv is calculated according to formula (3) to two significant figures. Wu Zhong:
Coefficient of dispersion.
Test report
The test report should at least include the following contents: a)
Specimen name, specifications and appearance quality;
Specimen manufacturing unit or testing unit;
Specimen state adjustment and test environment conditions; Barcol hardness tester model;
Test results,
Test method standard number:
Test personnel, date.
Reinforced plastics
GB/T 3854--2005
Minimum number of measurements
（3）
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