1.1 本规程涵盖了设计、制备和使用ASTM标准拉伸试样的程序，用于研究应力腐蚀开裂的敏感性。轴向加载的试样可以使用施加恒定载荷、恒定应变或连续增加应变的设备进行定量应力。 1.2 拉伸试样适用于测试各种产品形式以及通过焊接、铆接或各种其他方法连接的零件。 1.3 试样在腐蚀性环境中的暴露仅作了简要处理，因为正在制定其他标准来处理这一方面。同时，调查员被转介至实践 G35 ， G36 ， G37 和 G44 ，以及ASTM特殊技术出版物425 ( 1. )。 2. 1.4 以国际单位制表示的数值应视为标准。SI单位后括号中给出的值仅供参考，不视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 4.1 轴向加载的拉伸试样是进行应力腐蚀试验的最通用方法之一，因为试样的类型和尺寸、应力程序和应力水平范围的选择具有灵活性。 4.2 单轴应力系统简单；因此，这种试验方法经常用于应力腐蚀机理的研究。这种类型的试验适用于非应力试样（无施加载荷）与应力试样同时暴露，以及随后的拉伸试验，以区分真实应力腐蚀和机械过载的影响 ( 2. ) .关于测试结果的重要性及其解释的其他考虑因素在第节中给出 6. 和 10 。 4.3 对于给定的材料和试样方向，在不同的试样尺寸和应力程序下，试验结果可能会有很大的变化。这种考虑意义重大，尤其是在实验室间比较或质量控制的测试程序标准化方面。

1.1 This practice covers procedures for designing, preparing, and using ASTM standard tension test specimens for investigating susceptibility to stress-corrosion cracking. Axially loaded specimens may be stressed quantitatively with equipment for application of either a constant load, constant strain, or with a continuously increasing strain. 1.2 Tension test specimens are adaptable for testing a wide variety of product forms as well as parts joined by welding, riveting, or various other methods. 1.3 The exposure of specimens in a corrosive environment is treated only briefly because other standards are being prepared to deal with this aspect. Meanwhile, the investigator is referred to Practices G35 , G36 , G37 , and G44 , and to ASTM Special Technical Publication 425 ( 1 ). 2 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Axially loaded tension specimens provide one of the most versatile methods of performing a stress-corrosion test because of the flexibility permitted in the choice of type and size of test specimen, stressing procedures, and range of stress levels. 4.2 The uniaxial stress system is simple; hence, this test method is often used for studies of stress-corrosion mechanisms. This type of test is amenable to the simultaneous exposure of unstressed specimens (no applied load) with stressed specimens and subsequent tension testing to distinguish between the effects of true stress corrosion and mechanical overload ( 2 ) . Additional considerations in regard to the significance of the test results and their interpretation are given in Sections 6 and 10 . 4.3 Wide variations in test results may be obtained for a given material and specimen orientation with different specimen sizes and stressing procedures. This consideration is significant especially in the standardization of a test procedure for interlaboratory comparisons or quality control.