Influence of Geometric Characteristics on Fatigue Behavior and Life Evaluation of Deep-water Platform Welding Structures
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摘要: 疲劳损伤是引起深水平台结构破坏的主要原因,针对海上常用钢EH36进行对接和T型焊接接头的疲劳寿命测试,证明接头形式是影响疲劳寿命的主要原因。同时焊接接头的疲劳寿命具有强烈的疲劳分散性,随着应力范围的降低,疲劳寿命的分散程度逐渐增大,T型焊接接头的疲劳分散程度大于对接焊接接头的。通过DIC对焊接接头疲劳行为进行监测,结果发现,T型焊接接头表现出了更大的应力集中程度和应力梯度效应,焊趾形貌和应力范围是影响焊接接头疲劳寿命分散程度的主要原因。在热点疲劳寿命评估中,0.4t~1.0t外推点表现出更为精准和有效的计算结果,但是热点应力具有一定的网格敏感性,疲劳设计时需要根据推荐的网格大小进行划分。Abstract: Fatigue damage is the main cause for the structural damage of the deep-water platform. The fatigue life test of the butt and T-welded joints of the EH36 steel commonly used at sea proves that the joint form is the main reason affecting the fatigue life. Besides, the fatigue life of the welded joints has strong fatigue dispersion. With the decrease of the stress range, the fatigue life dispersion degree increases gradually. The fatigue dispersion degree of the T-welded joint is greater than that of the butt welded joint. The coupled digital image correlation(DIC) monitoring of the fatigue behaviors of the welded joints shows that the T-shaped welded joint shows greater stress concentration and stress gradient effect, and that the shape of the weld toe and stress range are the main reasons affecting the fatigue life dispersion degree of the welded joints. In the evaluation of the hot spot fatigue life, the 0.4t-1.0t extrapolation points have more accurate and effective calculation results, but the hot spot stress has to be divided according to the recommended grid size in the fatigue design.
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Keywords:
- welded joint /
- stress concentration /
- hot spot stress /
- fatigue life evaluation
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