低合金钢螺栓的S-N疲劳设计与试验数据

[中文适用范围]： 本测试程序的范围是获取螺栓材料疲劳数据，用于对承受疲劳载荷的螺栓进行设计验证分析，以确保准确的设计寿命估算。螺栓疲劳测试程序提供了在空气和盐水+阴极保护环境中三个交变应力范围的S-N疲劳曲线，以及第一阶段1英寸、2英寸（L7级）和3英寸（L43级）螺栓尺寸，以及第二阶段1英寸（L7级）和3英寸（L43级）螺栓尺寸。这些S-N疲劳测试的结果允许通过结构分析使用螺栓中的公称根面积应力来评估螺栓的S-N疲劳，避免了定义啮合螺纹螺栓根半径处的应力和载荷集中的需要。本文档中提供的设计指南和疲劳数据旨在用于符合ASME B1.1 [5] 2A/2B级统一国家螺纹带根半径（UNR）规范的螺栓。 [外文原描述]： The scope of the test program was to obtain bolting material fatigue data required to perform design verification analysis of bolting subjected to fatigue loading to assure accurate design life estimation. The bolting fatigue testing program provided S-N fatigue curves for three alternating stress ranges in air and in saltwater with CP environments and for bolt sizes of 1 in., 2 in. (Grade L7), and 3 in. (Grade L43) in Phase I and for bolt sizes 1 in. (Grade L7) and 3 in. (Grade L43) in Phase II. The results of these S-N fatigue tests allow the bolting design to be assessed for S-N fatigue through structural analysis using the nominal root area stresses in the bolt, avoiding the need to define stress and load concentrations in the bolt root radius of engaged threads. The design guidelines and the fatigue data provided in the document are intended to be used for bolting with unified national thread with root radius (UNR) specifications of ASME B1.1 Class 2A/2B.