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首页> 外文学位 >Analysis of fatigue crack propagation behavior of a surface crack at fillet toe of tubular joints.
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Analysis of fatigue crack propagation behavior of a surface crack at fillet toe of tubular joints.

机译：管状接头圆角处表面裂纹的疲劳裂纹扩展行为分析。

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摘要

Fixed offshore structures and various forms of mobile structures are fabricated from tubular steel members. Engineering design approaches based on the hot spot stress concept, in conjunction with S-N curves, are used to ensure satisfactory fatigue strength. However, alternative techniques involving fracture mechanics must be required to assess crack propagation behavior and remaining life for a detected crack shape. To perform such an evaluation, the stress intensity factor distribution for a surface crack at the fillet weld toe must be calculated so that mixed mode fatigue analysis can be carried out.; The objective of this study is to establish a method of calculating the stress intensity factor distribution along the crack front for a surface crack in a welded tubular joint and to determine the direction and shape of crack propagation as a function of the fatigue loading cycle. Finite element structural analysis is used to calculate the stress field for a T-type tubular joint. A surface crack is assumed to exist at the maximum strain energy density area. The characteristics of calculated stress intensity factors along the surface crack of the tubular joint using the line spring element method display mixed mode conditions due to geometrical complexity.; The crack growth direction is determined using the concept of the minimum strain energy density factor. Mixed mode stress intensity factors are calculated along the crack front using the new modified line spring element method. The strain energy density factor concept was used as a parameter for mixed mode fracture mechanics to determine fatigue crack propagation behavior and crack shape. Numerical simulation is conducted to estimate fatigue crack growth behavior of the T-type tubular joint. Assessment of the experimental data shows that use of the mixed mode line spring element method along with the mixed mode fatigue law is necessary and that the strain energy density factor is a reliable parameter for the fatigue analysis of welded tubular joints.
机译：固定式海上结构和各种形式的活动结构均由管状钢构件制成。基于热点应力概念的工程设计方法与S-N曲线一起用于确保令人满意的疲劳强度。但是，必须采用涉及断裂力学的替代技术来评估裂纹扩展行为和检测到的裂纹形状的剩余寿命。为了进行这种评估，必须计算出角焊缝趾表面裂纹的应力强度因子分布，以便可以进行混合模式疲劳分析。这项研究的目的是建立一种计算方法，以计算焊接管状接头表面裂纹沿裂纹前沿的应力强度因子分布，并确定裂纹扩展的方向和形状与疲劳载荷循环的关系。有限元结构分析用于计算T型管接头的应力场。假定在最大应变能密度区域存在表面裂纹。使用线弹簧元件法计算的沿管状接头表面裂纹的应力强度因子的特性由于几何复杂性而显示出混合模式条件。裂纹扩展方向是使用最小应变能密度因子的概念确定的。使用新的改进的线弹簧元法，沿着裂纹前沿计算混合模式应力强度因子。应变能密度因子概念被用作混合模式断裂力学的参数，以确定疲劳裂纹扩展行为和裂纹形状。进行了数值模拟，以估计T型管接头的疲劳裂纹扩展行为。对实验数据的评估表明，必须使用混合模式线弹簧元件方法以及混合模式疲劳定律，并且应变能密度因子是焊接管状接头疲劳分析的可靠参数。

著录项

  • 作者

    Kim, Dong Sub.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Mechanical.; Engineering Civil.; Engineering Marine and Ocean.
  • 学位 Ph.D.
  • 年度 1989
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;建筑科学;海洋工程;
  • 关键词

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