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ISO 178-2010

塑料 弯曲性能测定

Plastics -- Determination of flexural properties

适用范围:ISO 178:2010 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. The method is used to investigate the flexural behaviour of the test specimens and to determine 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). The method is suitable for use with the following range of materials: thermoplastic moulding, extrusion and casting materials, including filled and reinforced compounds in addition to unfilled types; rigid thermoplastics sheets; thermosetting moulding materials, including filled and reinforced compounds; thermosetting sheets. ISO 178:2010 applies to fibre-reinforced compounds with fibre lengths less than or equal to 7,5 mm prior to processing. For long-fibre-reinforced materials (laminates) with fibre lengths greater than 7,5 mm, see ISO 14125. The method is not normally suitable for use with rigid cellular materials or sandwich structures containing cellular material. In such cases, ISO 1209?1 and/or ISO 1209?2 can be used. Contrary to the previous editions of this International Standard, this edition specifies two methods, method A and method B. Method A is identical to the method in previous editions of this International Standard, i.e. it uses a strain rate of 1 %/min throughout the test. Method B uses two different strain rates: 1 %/min for the determination of the flexural modulus and 5 %/min or 50 %/min, depending on the ductility of the material, for the determination of the remainder of the flexural stress-strain curve.

发布日期: 2010-12-01

实施日期: 2010-12-01

中标分类号: G31 - 化工 - 合成树脂、塑料基础标准与通用方法

ICS分类号: 83.080.01 - 橡胶和塑料工业 - 塑料综合

标准组织: ISO - 国际标准化组织标准

全文来源: WF

英文关键词: Bend testing Bending stiffness Bending strength Conditioning Conditioning climate Definitions Determination Flexibility Flexural creep Flexural strength Interpretations Material testing machines Materials testing Mathematical calculations Plastics Polymers Precision Rigid Test atmospheres Test equipment Test specimens Testing Thermoplastic polymers Thermosetting polymers Three-point loading

语种: 汉语

页数: 19

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