Standard Test Methods for Flexural Properties of ...（弯曲性能的标准测试方法u2026）.pdfVIP

Designation: D 790 – 03 Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials1 This standard is issued under the fixed designation D 790; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope* 2. Referenced Documents 1.1 These test methods cover the determination of flexural 2.1 ASTM Standards: properties of unreinforced and reinforced plastics, including D 618 Practice for Conditioning Plastics for Testing2 high-modulus composites and electrical insulating materials in D 638 Test Method for Tensile Properties of Plastics2 the form of rectangular bars molded directly or cut from sheets, D 883 Terminology Relating to Plastics2 plates, or molded shapes. These test methods are generally D 4000 Classification System for Specifying Plastic Mate- applicable to both rigid and semirigid materials. However, rials3 flexural strength cannot be determined for those materials that D 5947 Test Methods for Physical Dimensions of Solid do not break or that do not fail in the outer surface of the test Plastic Specimens4 specimen within the 5.0 % strain limit of these test methods. D 6272 Test Method for Flexur