GB/T 9341-2000
Plastics--Determination of flexural properties

2009-04
Standard No.
GB/T 9341-2000
Language
Chinese
Release Date
2000
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Replace By
GB/T 9341-2008
Lastest
GB/T 9341-2008
Scope
1.1 This standard stipulates the method of measuring the bending properties of plastics under specified conditions, specifies the standard sample, and also provides the size parameters and test speed range for the suitable alternative sample. 1.2 This method is used to study the flexural properties of samples under specified conditions, and to determine the flexural strength, flexural modulus, and flexural stress-strain relationship. This method is applicable to tests with free support at both ends and central loading (three-point loading test). 1.3 This method is applicable to the following materials: - thermoplastic molding and extrusion materials, including filled and reinforced unfilled materials and rigid thermoplastic sheets; - thermosetting molding materials, including filled and reinforced materials, thermosetting sheet materials, including Laminates; - fibre-reinforced thermosetting and thermoplastic composites containing unidirectional or non-unidirectional reinforcements such as felts, textile fibres, textile rovings, chopped strands, combined or hybrid reinforcements, rovings and ground Shredded fibers, etc.; sheets made of pre-impregnated materials; - thermotropic liquid crystal polymers. This method is generally not suitable for hard microporous materials and sandwich structure materials containing microporous materials. Note 1: For some textile fiber reinforced plastics, it is better to use the four-point bending test. 1.4 The test specimens used in this method may be molded specimens of selected dimensions, or specimens machined from the middle of standard multipurpose specimens, or specimens made of finished or semi-finished products such as molded parts, laminates, extruded or machined specimens from cast plate. 1.5 This method specifies the optimum sample size, and the test results are incomparable with samples of different sizes or prepared under different conditions. Other factors, such as test speed and conditioning of the specimen can also affect test results. Therefore, these factors must be carefully controlled and documented when data comparisons are required. 1.6 Only materials with linear stress-strain characteristics can be used as the basis for engineering design, while the bending properties of nonlinear materials are only nominal values. For brittle materials, that is, materials that are difficult to perform tensile tests, the bending test is best used.

GB/T 9341-2000 history



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