This part of GB/T 15970 deals with the design, preparation and use procedures of bent beam specimens for studying the susceptibility of metals to stress corrosion. The term "metal" used in this part of GB/T 15970 includes alloys. Bent beam specimens can be used to test various forms of products. They are mainly suitable for rolled strips, plates or tubes, which can conveniently provide sheet specimens with rectangular cross-sections, but are also used for castings, wires, rods or machined specimens with circular cross-sections. Bent beam specimens can also be used for welded parts. The preparation and loading equipment of the specimens are simple and inexpensive, so bent beam specimens are particularly suitable for large-scale tests and atmospheric stress corrosion tests. Bent beam specimens are generally tested under nominal constant strain conditions, but nominal constant load conditions can also be used. In both cases, local changes in the curvature of the specimen when cracking occurs will lead to changes in the conditions during the crack propagation period. The "test stress" should be the highest surface tensile stress at the beginning of the test. GB/T 15970.2-2000 Corrosion of metals and alloys Stress corrosion testing Part 2: Preparation and application of bent beam specimens GB/T15970.2-2000 standard download decompression password: www.bzxz.net