GB/T 9341-2008
Plastic.Determination of flexural properties (English Version)

GB/T 9341-2008
Standard No.
GB/T 9341-2008
Language
Chinese, Available in English version
Release Date
2008
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 9341-2008
Replace
GB/T 9341-2000
Scope
This standard specifies the method for determining the flexural properties of rigid and semi-rigid plastics under specified conditions. Standard specimens are specified, and dimensional parameters and test speed ranges are also provided for alternative specimens suitable for use. This standard is used to study the flexural properties of samples under specified conditions [1], and determine the relationship between flexural strength, flexural modulus and flexural stress-strain. This standard applies to tests with free support at both ends and central loading (three-point loading test). This standard applies to the following materials: - thermoplastic molding and extrusion materials, including filled and reinforced unfilled materials and rigid thermoplastic sheet. - Thermosetting molding materials, including filling and reinforcing materials and thermosetting sheets. According to GB/T 19467.1-2004[2] and GB/T 19467.2-2004[3], this standard is applicable to fiber-reinforced materials with fiber length ≤ 7.5mm before processing. For long-fiber-reinforced materials (laminates) with fiber lengths >7.5 mm, see Ref. [4]. This standard is generally not applicable to rigid porous materials and sandwich structures containing porous materials. [5, 6] . The specimens used in this standard can be molded specimens of selected dimensions, or specimens machined in the middle of standard multi-purpose specimens (see GB/T 11997-2008), or from finished or semi-finished products such as molded Test pieces, extruded or cast sheets machined test pieces. This standard recommends the optimum test specimen size. The results of tests performed on test specimens of different sizes or prepared in different conditions are not comparable. Other factors, such as test speed and the state conditioning of the specimen can also affect the test results. Especially for semi-crystalline polymers, the thickness of the skin layer depends on the molding conditions and the thickness of the specimen, which can affect the bending performance. Therefore, when data comparison is required, careful control and Record these factors. 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 best It is best to use the bending test.

GB/T 9341-2008 Referenced Document

  • GB/T 11997-2008 Plastic.Multipurpose test specimens*， 2008-08-24 Update
  • GB/T 17037.1-1997 Injection moulding of test specimens of thermoplastic materails--Part 1: General principles and moulding of multipurpose and bar test specimens
  • GB/T 17200-1997 Requirements for tensile, flexural and compression testing machines for rubbers and plastics
  • GB/T 2918-1998 Plastics--Standard atmospheres for conditioning and testing
  • GB/T 5471-2008 Plastic.Compression moulding of test specimens of thermosetting materials*， 2008-09-04 Update
  • GB/T 9352-2008 Plastic.Compression moulding of test specimens of thermoplastic materials
  • ISO 10724-1:1998 Plastics - Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) - Part 1: General principles and moulding of multipurpose test specimens
  • ISO 2602:1980 Statistical interpretation of test results; estimation of the mean; confidence interval
  • ISO 2818:1994 Plastics - Preparation of test specimens by machining

GB/T 9341-2008 history



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