ISO 7539-6:2018 金属与合金的腐蚀 应力腐蚀测试 第6部分：恒定负荷或恒定位移条件下试验用预破裂试样的制备和使用
标准编号：ISO 7539-6:2018
中文名称：金属与合金的腐蚀 应力腐蚀测试 第6部分：恒定负荷或恒定位移条件下试验用预破裂试样的制备和使用
英文名称：Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement
发布日期：2018-08
标准范围
本文件规定了用于调查应力腐蚀敏感性的预裂纹试样的设计、制备和使用程序。它为研究应力腐蚀敏感性的预裂纹试样的设计、制备和使用提供了建议。关于缺口试样的建议见附录A。本文件中使用的术语“金属”包括合金。由于需要限制裂纹尖端的塑性，预裂纹试样不适合评估薄产品，如板材或线材，通常用于较厚的产品，包括板棒和锻件。它们也可用于通过焊接连接的零件。预裂试样可以用施加恒定载荷的设备加载，也可以使用在加载点产生恒定位移的装置。ISO 7539-9规定了在增加位移或增加荷载下进行的试验。预裂纹试样的一个特殊优点是，它们允许获取数据，从中可以估计承受已知应力的已知几何形状部件的临界缺陷尺寸，超过该尺寸时可能发生应力腐蚀开裂。它们还可以确定应力腐蚀裂纹扩展速率。在维修期间监测含有缺陷的零件时，可以考虑后一种数据。
This document specifies procedures for designing, preparing and using precracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of precracked specimens for investigating susceptibility to stress corrosion. Recommendations concerning notched specimens are given in Annex A.The term "metal" as used in this document includes alloys.Because of the need to confine plasticity at the crack tip, precracked specimens are not suitable for the evaluation of thin products, such as sheet or wire, and are generally used for thicker products including plate bar and forgings. They can also be used for parts joined by welding.Precracked specimens can be loaded with equipment for application of a constant load or can incorporate a device to produce a constant displacement at the loading points. Tests conducted under increasing displacement or increasing load are dealt with in ISO 7539-9.A particular advantage of precracked specimens is that they allow data to be acquired, from which critical defect sizes, above which stress corrosion cracking can occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined. The latter data can be taken into account when monitoring parts containing defects during service.
标准预览图
