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首页> 外文期刊>Journal of applied mathematics >Efficient Fatigue Analysis of Helix Elements in Umbilicals and Flexible Risers: Theory and Applications
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Efficient Fatigue Analysis of Helix Elements in Umbilicals and Flexible Risers: Theory and Applications

机译：脐带缆和挠性冒口中螺旋元素的有效疲劳分析：理论与应用

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Fatigue analysis of structural components such as helix tensile armors and steel tubes is a critical design issue for dynamic umbilicals and flexible pipes. The basis for assessment of fatigue damage of such elements is the long-term stress cycle distribution at critical locations on the helix elements caused by long-term environmental loading on the system. The long-term stress cycle distribution will hence require global dynamic time domain analysis followed by a detailed cross-sectional analysis in a large number of irregular sea states. An overall computational consistent and efficient fatigue analysis scheme is outlined with due regard of the cross-sectional analysis technique required for fatigue stress calculation with particular attention to the helix elements. The global cross-section is exposed to pure bending, tensile, torsion, and pressure loading. The state of the different cross-section elements is based on the global response. Special emphasis is placed on assessment of friction stresses caused by the stick-slip behavior of helix elements in bending that are of special importance for fatigue life assessments. The described cross-sectional analysis techniques are based on an extensive literature survey and are hence considered to represent industry consensus. The performance of the described calculation scheme is illustrated by case studies.
机译：诸如螺旋拉伸装甲和钢管之类的结构部件的疲劳分析是动态脐带缆和挠性管的关键设计问题。评估此类元件疲劳损伤的基础是系统上长期的环境负荷所导致的螺旋元件关键位置的长期应力循环分布。因此，长期应力循环分布将需要进行全局动态时域分析，然后在大量不规则海况中进行详细的横截面分析。在适当考虑疲劳应力计算所需的横截面分析技术的情况下，概述了总体计算一致且有效的疲劳分析方案，尤其要注意螺旋元素。整体横截面承受纯弯曲，拉伸，扭转和压力载荷。不同横截面元素的状态基于整体响应。特别强调评估由螺旋元件在弯曲中的粘滑行为引起的摩擦应力，这对于疲劳寿命评估特别重要。所描述的横截面分析技术基于广泛的文献调查，因此被认为代表了业界共识。案例研究说明了所描述的计算方案的性能。

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