4.1 This test standard describes how to evaluate the relative sensitivity of materials and components to dynamic pressure impacts by various gaseous fluid media (can include gas mixtures).
4.2 Changes or variations in test specimen configurations, thickness, preparation, and cleanliness can cause a significant change in their impact ignition sensitivity/reaction. For material tests, the test specimen configuration shall be specified on the test report.
4.3 Changes or variation in the test system configuration from that specified herein may cause a significant change in the severity produced by a dynamic pressure surge of the gaseous media.
4.4 A reaction is indicated by an abrupt increase in test specimen temperature, by obvious changes in odor, color, or material appearance, or a combination thereof, as observed during post-test examinations. Odor alone is not considered positive evidence that a reaction has occurred. When an increase in test specimen temperature is observed, a test specimen reaction must be confirmed by visual inspection. To aid with visual inspection, magnification less than 10× can be used.
4.5 When testing components, the test article must be disassembled and the nonmetallic materials examined for evidence of ignition after completion of the specified pressure surge cycles.
4.6 Ignition or precursors to ignition for any test sample shall be considered a failure and are indicated by burning, material loss, scorching, or melting of a test material detected through direct visual means. Ignition is often indicated by consumption of the non-metallic material under test, whether as an individual material or within a component. Partial ignition can also occur, as shown in Fig. 3a, b, and c, and shall also be considered an ignition (failure) for the purpose of this test standard.
材料试验机,是在各种条件、环境下测定金属材料、非金属材料、机械零件、工程结构等的机械性能、工艺性能、内部缺陷和校验旋转零部件动态不平衡量的精密测试仪器。长期以来,试验机作为很重要的一类科学仪器,广泛地应用于制造业加工业等各行各业。几乎我们平时所接触的行业都可以用到试验机奥。比如服装业,测布料拉力,汽车业,测零件牢固程度,测屏幕耐压等等。...
灼热丝试验仪适用于对电工电子产品、元件、家用电器部件用的塑料及非金属绝缘材料零件如:开关外壳、继电器插座等部件或零件在故障或过载条件下,可能达到过高的温度或点燃它们附近的零件,灼热丝试验模拟灼热元件或过载的电阻之类的热源或点火源在短时间所造成的热应力,用模拟技术评定着火危险性。 灼热丝试验仪用于检测材料和成品的耐火特性。灼热丝自身作为火源。灼热丝的温度由一台温度控制器设置和控制。...
用途 试验机是在各种条件、环境下测定金属材料、非金属材料、物理性能 机械零件、工程结构等的机械性能、工艺性能、 内部缺陷和校验旋转零部件动态不平衡量的精密测试仪器。 机种分类 试验机分为化学成分试验机和物理性能试验机,他们之间都有不同的功用,都是用来检测产品是否符合国家规定的相关标准。 ...
材料要求 合格证明 阀主要零部件材料应有化学成分和物理性能的合格证明。 零部件材料 阀主要零部件的材料应满足下列要求: 一一阀主要零部件的材料应与使用的温度、压力和制冷剂相适应; 一一阀主要零部件的材料应满足阀的性能与强度要求。 ...
Copyright ©2007-2022 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证:京ICP证110310号