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Description of ASTM-D6272 2010ASTM D6272 - 10Standard Test Method for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials by Four-Point BendingActive Standard ASTM D6272 | Developed by Subcommittee: D20.10 Book of Standards Volume: 08.03 ASTM D6272Significance and Use Flexural properties determined by this test method are especially useful for quality control and specification purposes. This test method may be more suited for those materials that do not fail within the strain limits imposed by Test Method D790 . The major difference between four point and three point bending modes is the location of the maximum bending moment and maximum axial fiber stress. In four point bending the maximum axial fiber stress is uniformly distributed between the loading noses. In three point bending the maximum axial fiber stress is located immediately under the loading nose. Flexural properties may vary with specimen depth, temperature, atmospheric conditions, and the difference in rate of straining specified in Procedures A and B. Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the material specification, or both, shall take precedence over those mentioned in this test method. If there are no material specifications, then these default conditions apply. Table 1 in Classification D4000 lists the ASTM materials standards that currently exist. 1. Scope 1.1 This test method covers the determination of flexural properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes. These test methods are generally applicable to rigid and semirigid materials. However, flexural strength cannot be determined for those materials that do not break or that do not fail in the outer fibers. This test method utilizes a four point loading system applied to a simply supported beam. 1.2 This test method may be used with two procedures: 1.2.1 Procedure A , designed principally for materials that break at comparatively small deflections. 1.2.2 Procedure B , designed particularly for those materials that undergo large deflections during testing. 1.2.3 Procedure A shall be used for measurement of flexural properties, particularly flexural modulus, unless the material specification states otherwise. Procedure B may be used for measurement of flexural strength. 1.3 Comparative tests may be run according to either procedure, provided that the procedure is found satisfactory for the material being tested. 1.4 The values stated in SI units are to be regarded as the standard. The values provided in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Note 1This test method is equivalent to ISO 14125 (Method B).
ASTM Standards D618 Practice for Conditioning Plastics for Testing D638 Test Method for Tensile Properties of Plastics D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials D883 Terminology Relating to Plastics D4000 Classification System for Specifying Plastic Materials D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens E4 Practices for Force Verification of Testing Machines E83 Practice for Verification and Classification of Extensometer Systems E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method ISO Standard ISO14125(MethodB) Fibre-Reinforced Plastic Composites--Determination of Flexural PropertiesKeywords flexural properties; four point bending; plastics; stiffness; strength; Electrical insulating plastics; Flexural testing--plastics; Four-point bending; High modulus fibrous composites; Reinforced plastics; Stiffness--plastics; Unreinforced plastics; ICS Code ICS Number Code 29.035.20 (Plastic and rubber insulating materials); 83.080.01 (Plastics in general) DOI: 10.1520/D6272-10 ASTM International is a member of CrossRef. ASTM D6272The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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