GB/T 15970.2-2000 in English

《GB/T 15970.2-2000金属和合金的腐蚀 应力腐蚀试验 第2部分:弯梁试样的制备和应用》由TC183（全国钢标准化技术委员会）归口，TC183SC11（全国钢标准化技术委员会金属和合金的腐蚀分会）执行，主管部门为中国钢铁工业协会。
GB/T 15970的本部分涉及弯梁试样的设计、制备和使用程序，用于研究金属应力腐蚀的敏感性。在GB/T 15970中的本部分中所用术语“金属”一词包括合金。弯梁试样可用于试验多种形式产品。主要适用于轧制的带材、板材或管材，由此能方便地提供具有矩形截面的片状试样，但也用于铸材、丝、棒或具有圆形截面的机加工试样。弯梁试样也能适用于焊接部件。试样的制备和加载装置既简单又价廉，因此，弯梁试样特别适用于大量试验及大气应力腐蚀试验。弯梁试样一般在名义恒应变条件下进行试验，但也可采用名义恒负荷条件。在两种情况下，开裂发生时试样弧度的局部变化将导致裂纹扩展期条件的改变。“试验应力”应取试验开始的最高表面张应力。

Scope

This part of GB/T 15970 deals with the design, preparation and use procedures of bent beam specimens for the study of the susceptibility of metals to stress corrosion. The term "metal" used in this part of GB/T 15970 includes alloys. Bending beam specimens can be used to test various forms of products. Primarily suitable for rolled strip, plate or tube, whereby sheet specimens with a rectangular cross-section are conveniently available, but also for cast material, wire, rod or machined specimens with a circular cross-section. Bent beam specimens can also be applied to welded components. The preparation of the sample and the loading device are simple and cheap. Therefore, the bent beam sample is especially suitable for a large number of tests and atmospheric stress corrosion tests. Bending beam specimens are generally tested under nominal constant strain conditions, but nominal constant load conditions can also be used. In both cases, a local change in the curvature of the specimen when cracking occurs will result in a change in the crack growth conditions. "Test stress" shall be taken as the highest surface tension stress at the beginning of the test.