ChinaAutoRegs\uff5cGB\/T 9341-2008 \u82f1\u6587\u7248\/English\/\u7ffb\u8bd1\/\u5851\u6599 \u5f2f\u66f2\u6027\u80fd\u7684\u6d4b\u5b9a
\nPlastics – Determination of Flexural Properties<\/p>\n
\n1 SCOPE<\/p>\n
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.<\/p>\n
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).<\/p>\n
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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.<\/p>\n
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.<\/p>\n
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ChinaAutoRegs\uff5cGB\/T 9341-2008 \u82f1\u6587\u7248\/English … \u7ee7\u7eed\u9605\u8bfb