GB/T 33609-2017 PDF in English
GB/T 33609-2017 (GB/T33609-2017, GBT 33609-2017, GBT33609-2017)
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Flexible cellular polymeric materials -- Determination of hysteresis loss
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Standards related to (historical): GB/T 33609-2017
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GB/T 33609-2017: PDF in English (GBT 33609-2017) GB/T 33609-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.100
G 32
Flexible cellular polymeric materials - Determination of
hysteresis loss
ISSUED ON: MAY 12, 2017
IMPLEMENTED ON: DECEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principle ... 5
5 Instruments ... 5
6 Specimens ... 6
7 Conditioning ... 7
8 Test steps ... 7
9 Repeated test ... 9
10 Calculation and expression of results ... 9
11 Test report ... 9
Flexible cellular polymeric materials - Determination of
hysteresis loss
1 Scope
This standard specifies two test methods for determining the hysteresis loss properties
of flexible cellular polymeric materials.
- Method A: Determination of hysteresis loss by compression method;
- Method B: Determination of hysteresis loss by depression method.
This standard applies to the determination of hysteresis loss of flexible cellular
polymeric materials. Method A and method B in this standard are applicable to standard
size specimens, which are cut from block materials or molded specimens with various
shapes; method B is also applicable to molded products with various shapes.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing
GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear
dimensions
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Hysteresis loss
After the specimen is deformed by the compression method (the indenter area is
larger than the specimen area) or the depression method (the indenter area is smaller
than the specimen area), the specimen is immediately allowed to recover and the
ratio of the lost work to the loaded work in this process is measured.
between the support plate (see 5.2) and the indenter (see 5.3). The indenter can move
perpendicular to the support plate at a constant speed required by this test: (50 ± 5)
mm/min, (100 ± 20) mm/min, (250 ± 25) mm/min.
The testing machine shall have the ability to measure the force to produce the specified
deformation with an accuracy of ±1%, and the ability to measure the specimen thickness
at an accuracy of ±0.2 mm under load.
The testing machine shall be equipped with a device for automatically drawing the test
load-displacement curve.
5.2 Support plate
The support plate is made of rigid material. The surface shall be smooth, flat, horizontal
and larger than the specimen. The support plate shall be provided with multiple holes
with a diameter of 6 mm and a hole spacing of 20 mm, to facilitate the discharge of gas
generated during the test.
5.3 Indenter
Method A (compression method): The indenter can be of any suitable size and shape
(round or square is recommended), with a smooth but unpolished surface and shall be
parallel to the support plate; the specimen shall be overlapped from all directions.
Method B (depression method): The indenter surface is smooth but not polished; it is
assembled using a ball-type connector to prevent vertical movement OR it may use
other appropriate methods. The diameter of the indenter is mm; the radius of
the bottom edge is mm; it shall be parallel to the support plate.
5.4 Measuring tools
The measuring tools for measuring the size of the specimen shall comply with the
provisions of GB/T 6342-1996.
6 Specimens
6.1 Shape and size
Method A (compression method): The side length of the specimen is (50 ± 2) mm and
the thickness is (25 ± 2) mm. The final product can also be tested according to the
agreement between the supplier and the buyer.
Method B (depression method): The side length of the specimen is mm and the
Measure the specimen dimensions in accordance with GB/T 6342-1996.
8.2 Method A (compression method)
Place the specimen on the support plate, so that the center of the specimen or the
position agreed upon by the supplier and the buyer is located below the indenter. The
indenter pre-compresses the specimen twice at a speed of (250 ± 25) mm/min to 75%
~ 80% of the initial thickness of the specimen. After reaching this deflection, unload
the pressure at the same speed. After each pre-compression, keep the indenter in contact
with the specimen surface. After two pre-compressions, let the specimen recover for (6
± 1) min.
After the specimen recovers, slowly lower the indenter and apply a force of about 140
Pa (not exceeding 200 Pa) on the specimen surface. Measure the specimen thickness.
This value is the compression zero point.
Immediately compress the specimen at a speed of (50 ± 5) mm/min to (75 ± 5)% of the
specimen thickness. Immediately unload at the same speed, until it is basically fully
recovered.
The load-displacement curve must be fully recorded during the test.
Calculate the hysteresis loss according to formula (1).
8.3 Method B (depression method)
Place the specimen on the support plate, so that the center of the specimen or the
position agreed upon by the supplier and the buyer is below the indenter. Slowly lower
the indenter and apply a force of N on the specimen surface. Measure the
specimen thickness. This value is the depression zero point.
The indenter pre-presses the specimen at a speed of (100 ± 20) mm/min to (75 ± 2.5)%
of the specimen thickness. After reaching this deflection, the pressure is immediately
unloaded at the same speed; then the specimen is allowed to recover for (4 ± 1) min.
After the specimen recovers, the specimen is immediately depressed at a speed of (100
± 20) mm/min to (75 ± 2.5)% of the specimen thickness. After reaching this deflection,
it is immediately unloaded at the same speed until it is basically fully recovered. The
time interval between the end of loading and the beginning of unloading shall not
exceed 2 s.
The load-displacement curve must be fully recorded during the test.
The hysteresis loss is calculated according to formula (1).
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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