典型圆管及圆管-方管相贯节点疲劳特性研究-结构工程专业论文.docxVIP

investigated and the parametric equations to calculate the stress concentration factor of circular-to-rectangular K-joint under balanced axial loads have been proposed. The effective notch stress approach was used to investigate the fatigue property of circular-to-rectangular(CHS-to-RHS) T-joint under axial load, which proved to be practicable, we get the parameter formula of circular-to-rectangular T-joint under axial load to calculate the notch stress concentration factor. At the same time, the fatigue life of the hot spot stress approach shows good agreement with the effective notch stress approach. At last, the local strain approach was used to investigate the fatigue life of circular-to-rectangular(CHS-to-RHS) T-joint under axial load, and the modified Neuber method was adopted to calculate the local elastic-plastic stress and strain of the T-joint, the results got by local strain approach are consistent with experiments. KEY WORDS: circular-to-rectangular welded tubular joint, fatigue property, parametric equations, hot spot stress approach, effective notch stress approach 目录 HYPERLINK \l _bookmark0 第一章 绪论1 HYPERLINK \l _bookmark1 1.1 引言1 HYPERLINK \l _bookmark3 1.2 钢管结构相贯节点简介2 HYPERLINK \l _bookmark6 1.3 相贯节点疲劳研究现状3 HYPERLINK \l _bookmark7 1.3.1 圆管相贯节点的疲劳研究现状4 HYPERLINK \l _bookmark8 1.3.2 方主管圆支管相贯节点的疲劳研究现状6 HYPERLINK \l _bookmark9 1.4 本文研究意义和内容7 HYPERLINK \l _bookmark10 第二章 相贯节点疲劳分析方法9 HYPERLINK \l _bookmark11 2.1 疲劳分析方法概述9 HYPERLINK \l _bookmark12 2.2 应力分类9 HYPERLINK \l _bookmark14 2.2.1 名义应力10 HYPERLINK \l _bookmark15 2.2.2 热点应力10 HYPERLINK \l _bookmark16 2.2.3 有效切口应力11 HYPERLINK \l _bookmark17 2.3 热点应力法11 HYPERLINK \l _bookmark18 2.3.1 热点应力的确定11 HYPERLINK \l _bookmark21 2.3.2 热点应力法的 S-N 曲线 13 HYPERLINK \l _bookmark23 2.3.3 热点应力集中系数14 HYPERLINK \l _bookmark24 2.4 有效切口应力法14 HYPERLINK \l _bookmark25 2.4.1 局部应力14 HYPERLINK \l _bookmark26 2.4.2 切口敏感性15 HYPERLINK \l _bookmark27 2.4.3 两种不同参考半径的有效切口应力法16 HYPERLINK