A Small-Crack Growth Law of Low Alloy Steels SNCM and Its Application to the Evaluation of Fatigue Life
A Small-Crack Growth Law of Low Alloy Steels SNCM and Its Application to the Evaluation of Fatigue Life
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低合金钢SNCM小裂纹扩展规律及其在疲劳寿命评价中的应用
DOI：
10.2472/jsms.43.1334
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
浩臣 宮川
中科院分区：
文献类型：
--
作者：
真宏 後藤;Goto Masahiro;Fukushima Shigeru;茂 福島;弘信 西谷;Nishitani Hironobu;紀雄 皮籠石;Kawagoishi Norio;Miyagawa Hiroomi;浩臣 宮川
由于低合金钢SNCM被广泛用于在极端恶劣的使用条件下运行的机械和结构，因此对其疲劳寿命进行评估具有重要意义。虽然已经出版了许多SNCM的疲劳数据表，但它们表现出很大的分散性，而且似乎很难直接从这些原始数据中预测疲劳寿命。采用四种不同热处理工艺、不同强度等级的低合金钢(SNCM439)平面试件进行了旋转弯曲疲劳试验。用塑性复型技术研究了材料的裂纹萌生和小裂纹扩展行为。通过对疲劳数据的分析，检验了SNCM的小裂纹扩展规律，提出了一种仅基于抗拉强度估算平面构件疲劳寿命的有效而简便的方法。通过将该方法应用于国家金属研究所发布的数据表，对该方法的有效性进行了检验。
Since low alloy steels SNCM are being used widely for machines and structures operated under extremely severe service conditions, it is important to evaluate their fatigue lives. Although many fatigue data sheets for SNCM have been published, they exhibit large scatter and it seems to be difficult to predict directly the fatigue life from these raw data. In this study, by using four kinds of plain specimens of a low alloy steel (SNCM439), which were subjected to different heat treatments and thus have different strength levels, rotating bending fatigue tests were carried out. The crack initiation and small crack growth behaviors were investigated by the plastic replica technique. By analyzing the fatigue data, a small-crack growth law for SNCM was examined, and then an effective and convenient method based only on tensile strength was presented for estimating the fatigue life of plain members. The validity of this method was checked by applying it to the data sheets published by the National Research Institute for Metals.