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GB/T 2567-2008 English PDF (GBT2567-2008)

GB/T 2567-2008 English PDF (GBT2567-2008)

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GB/T 2567-2008: Test methods for properties of resin casting body
GB/T 2567-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.120
Q 23
Replacing GB/T 2567~2571-1995, GB/T 4726-1984, GB/T 7194-1987
Partially replacing GB/T 8238-1987
Test methods for properties of resin casting body
ISSUED ON: JUNE 30, 2008
IMPLEMENTED ON: APRIL 01, 2009
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 Standard environment for testing ... 5 
4 Specimen ... 5 
5 Tests... 8 
6 Test results ... 29 
7 Test report ... 30 
Annex A (Normative) Drawing method ... 31 
Test methods for properties of resin casting body
1 Scope
This Standard specifies the test standard environment, specimen, test method,
test result and test report for properties of resin casting body.
This Standard is applicable to testing the tensile, compression, bending, simply-
supported beam impact toughness, torsion, alkali resistance and refractive
index of thermosetting resin castings for fiber reinforced plastics, castings of
special casting resins.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
ISO 2602, Statistical interpretation of test results - Estimation of the mean -
Confidence interval
3 Standard environment for testing
Ambient temperature: (23±2)°C, relative humidity (50±5)%.
4 Specimen
4.1 Specimen preparation
4.1.1 Mold
4.1.1.1 Flat casting mold
4.1.1.1.1 Materials
a) The template is a flat and smooth glass plate or steel plate. Its size is
determined according to the required specimen area plus the area of the
mold frame;
4.1.4 Specimen processing
4.1.4.1 Use a scribing tool on the casting plate. Mark the processing line
according to the specimen size. Sampling must avoid bubbles, cracks, pits,
stress concentration areas.
4.1.4.2 Machine the specimen. During processing, the surface of the specimen
shall be prevented from damage and defects such as scratches.
4.1.4.3 The rough surface needs to be finely ground with a fine file or sandpaper.
The size of the notch is detected with a special template.
4.1.4.4 Water can be used to cool during processing. Dry in time after
processing.
4.1.5 Internal stress examination
Before the casting body is tested, use polarized light to test the internal stress.
If there is internal stress, remove it.
4.1.6 Internal stress relief method
4.1.6.1 Oil bathing method
Place the specimen steadily in a container filled with oil. Immerse the entire
specimen in the oil. Place the container immersed in the specimen in the oven.
The temperature in the box is raised from room temperature to the glass
transition temperature of resin within 1 h. Turn off the power after 3 h of constant
temperature. After the oven is naturally cooled to room temperature, take the
specimen out from the oil bath. Carry out the internal stress observation.
NOTE: The oil used in the oil bath shall not have chemical effects on the specimen, and
shall not swell, dissolve, or absorb.
4.1.6.2 Air bathing method
Place the specimen in a drying oven with an air blower. The treatment
temperature and time are the same as in the oil bath.
4.2 Specimen visual inspection and quantity
4.2.1 Before the test, the specimen must be strictly inspected. The specimen
shall be flat, smooth, free of bubbles, cracks, obvious impurities and processing
damage and other defects.
4.2.2 Each group shall have at least 5 valid specimens.
4.3 Specimen state adjustment
4.3.1 Before the test, the specimen shall be placed under the test standard
environmental conditions for at least 24 h. The specimen after state adjustment
shall be tested under the same test standard environmental conditions as the
state adjustment (if otherwise specified, according to relevant regulations).
4.3.2 If the laboratory standard environmental conditions are not available, the
specimens can be placed in a desiccator before the test for at least 24 h.
4.4 Specimen measurement accuracy
4.4.1 The measurement of the working area of the specimen is accurate to
0.01mm.
4.4.2 The measurement accuracy of other values of the specimen shall be in
accordance with the provisions of the corresponding test method.
4.5 Test equipment
4.5.1 The load error of the test equipment does not exceed ±1%. The selection
of the test equipment range shall make the failure load of the specimen within
the range of 10% to 90% of the full scale (as far as possible to fall on one side
of the full scale) and not less than 4% of the full scale of the test equipment
(electronic tensile test equipment is according to relevant regulations).
4.5.2 The error of the measuring deformation instrument shall not exceed ±1%.
4.5.3 The test equipment can obtain the constant test speed specified in the
test method standard. The speed error does not exceed 1%.
4.5.4 The test equipment shall be regularly verified by the national metrology
department and used within the valid verification period.
5 Tests
5.1 Tensile test
5.1.1 Test principle
Apply a static tensile load at a constant speed along the axial direction of the
specimen until the specimen breaks or reaches a predetermined elongation.
Throughout the process, measure the load applied to the specimen and the
elongation of the specimen, so as to determine tensile stress (tensile yield
stress, tensile stress at break or tensile strength), tensile modulus of elasticity,
elongation at break rate and plot the stress-strain curve.
5.1.2 Specimen
5.2.4.1 Specimen preparation is according to the provisions of 4.1.
5.2.4.2 The visual inspection of the specimen shall be carried out in accordance
with the provisions of 4.2.
5.2.4.3 The state of the specimen is adjusted according to the provisions of 4.3.
5.2.4.4 Number the specimens. Measure the width and thickness of the
specimen at any 3 places (the diameter of the type II sample is measured at
any 3 places). Take the arithmetic mean. The measurement accuracy shall be
as specified in 4.4.
5.2.4.5 Place the specimen. Align the center line of the specimen with the center
line of the upper and lower platens. Make sure the end face of the specimen is
parallel to the surface of the platen. Adjust the testing machine. Make the
surface of the platen just contact the end face of the specimen. Apply the initial
load (about 5% of the failure load) to the specimen to avoid the initial region of
the stress-strain curve. Check and adjust specimen and deformation
measurement system. Keep the whole system in normal working condition.
5.2.4.6 When measuring the compressive elastic modulus, install a deformation
measuring instrument between the upper and lower pressing plates and the
contact surface of the specimen or in the middle of the height of the specimen.
Check the meter. Start the testing machine. Load in levels at a specified speed.
The level difference is 5% to 10% of the failure load. Load a...
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