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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Slow strain rate testing ： ウィキペディア英語版 Slow strain rate testing Slow strain rate testing (SSRT), also called constant extension rate tensile testing (CERT), is a standard〔Standard ASTM G129-00 (2006), "Standard Practice for Slow Strain Rate Testing to Evaluate the Susceptibility of Metallic Materials to Environmentally Assisted Cracking", ASTM International, 2006.〕〔Standard ISO 7539-7:2005, "Corrosion of metals and alloys -- Stress corrosion testing -- Part 7: Method for slow strain rate testing", International Organization for Standardization.〕 method of testing of materials, often metals, in which the specimen is subjected to elongation at a constant rate. The load is varied to maintain the constant extension rate. While extended, the material is exposed to an environment (temperature, specific fluid, etc.). The method evaluates the corrosion behaviour of the material in the given environment, often the environmental effects on the material fracture or stress-corrosion cracking susceptibility.〔G. M. Ugiansky, "Stress corrosion cracking: the slow strain-rate technique", ASTM International, 1979. ((Google books) )〕 == Effect of strain rate == The important characteristic of these tests is that the strain rate is low, for example extension rates selected in the range from 10−8 to 10−3 s−1. The selection of the strain rate is very important because the susceptibility to cracking may not be evident from result of tests at too low or too high strain rate.〔Parkins, R.N., "Slow Strain Rate Testing - 25 Years Experience". In: R. D. Kane (ed.), "Slow strain rate testing for the evaluation of environmentally induced cracking: research and engineering applications", ASTM International, 1993. ((Google books) )〕 For numerous material-environment systems, strain rates in range 10−5 - 10−6 s−1 are used; however, the observed absence of cracking at a given strain rate should not be taken as a proof of immunity to cracking. There are known cases wherein the susceptibility to stress-corrosion cracking only became evident at strain rates as low as 10−8 or 10−9 s−1. The fastest strain rate that will still promote SCC for a given environment-material system is called "critical strain rate", some values are given in the table:〔ASM Handbook. Volume 13, Corrosion. ASM International, 1997.〕 Nevertheless, the method is very suitable for mechanistic studies, as well as for relative ranking of susceptibility to cracking of different alloys, or aggressiveness of environments.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Slow strain rate testing」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.