GB/T 9341-2008: Plastics -- Determination of flexural properties

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Scope

1.1 This Standard specifies a method for determining the flexural properties
of rigid and semi-rigid plastics under defined conditions. A standard test
specimen is defined, but parameters are included for alternative specimen sizes
for use where appropriate. A range of test speeds is included.
1.2 The method is used to investigate the flexural behavior[1] of the test
specimens and for determining the flexural strength, flexural modulus and other
aspects of the flexural stress/strain relationship under the conditions defined. It
applies to a freely supported beam, loaded at midspan (three-point loading test).
1.3 The Standard is suitable for use with the following range of materials.
- thermoplastics moulding and extrusion materials, including filled and
reinforced compounds in addition to unfilled types; rigid thermoplastics
sheets;
- thermosetting moulding materials, including filled and reinforced
compounds; thermosetting sheets.
In agreement with GB/T 19467.1-2004[2] and GB/T 19467.2-2004[3], this
Standard applies to fiber-reinforced compounds with fiber lengths ≤7.5 mm prior
to processing. For long-fiber-reinforced materials (laminates) with fiber lengths >
7.5 mm, see reference[4] in the bibliography.
The method is not normally suitable for use with rigid cellular materials and
sandwich structures containing cellular material [5, 6].
NOTE. For certain types of textile-fiber-reinforced plastics, a four-point bending test is
preferred. It is described in reference[4].
1.4 The method is performed using specimens which may be moulded to the
specified dimensions, machined from the central portion of a standard
multipurpose test specimen (see GB/T 11997-2008) or machined from finished
or semi-finished products such as mouldings, or extruded or cast sheet.
1.5 The method specifies preferred dimensions for the test specimen. Tests
which are carried out on specimens of different dimensions, or on specimens
which are prepared under different conditions, may produce results which are
not comparable. Other factors, such as the test speed and the conditioning of
the specimens, can also influence the results. Especially for semi-crystalline
polymers, the thickness of the oriented skin layer, which is dependent on
moulding conditions and thickness, affects the flexural properties.
Consequently, when comparable data are required, these factors must be
carefully controlled and recorded.
1.6 Flexural properties can only be used for engineering design purposes for
materials with linear stress/strain behavior. For non-linear behavior, the flexural
properties are only nominal. The bending test should preferentially be used with
brittle materials, for which tensile tests are difficult.

Basic Data

Standard ID	GB/T 9341-2008 (GB/T9341-2008)
Description (Translated English)	Plastics -- Determination of flexural properties
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080.01
Word Count Estimation	17,135
Date of Issue	2008-08-04
Date of Implementation	2009-04-01
Older Standard (superseded by this standard)	GB/T 9341-2000
Quoted Standard	GB/T 2918-1998; GB/T 5471-2008; GB/T 9352-2008; GB/T 11997-2008; GB/T 17037.1-1997; GB/T 17200-1997; ISO 2602-1980; ISO 2818-1994; ISO 10724-1-1998
Adopted Standard	ISO 178-2001, IDT
Regulation (derived from)	National Standard Approval Announcement 2008 No.14 (Total No.127)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the method for the determination of rigid and semi-rigid plastic bending performance under specified conditions. Provides a standard sample, while the sample using suitable alternative dimensions and also provides a test speed range. This standard is used to study the bending characteristics of the sample under specified conditions. Determination of flexural strength, flexural modulus and flexural stress- strain relationship. This standard applies to both ends of the Liberal support, central loading tests (three-point loading test).