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波浪冲击下钢丝绳索具应力场与疲劳寿命研究

Research on Stress Field and Fatigue Life of Wire Rope Sling under the Impact of Waves
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摘要 钢丝绳索具是海洋工程吊装平台起柔性连接的关键部件,常受到不规则波浪的冲击作用,采用流固耦合方法进行应力与疲劳寿命的研究对钢丝绳索具的安全具有重要意义。基于SOLIDWORKS与ANSYS平台,建立钢丝绳索具单向流固耦合分析模型,结合虚拟疲劳寿命分析方法,对波浪冲击下钢丝绳索具的应力与疲劳寿命进行有限元分析,同时对比了静载下钢丝绳索具的应力与疲劳寿命特性,为钢丝绳索具的设计与性能评估提供理论依据。通过分析发现,波浪冲击使钢丝绳索具内部应力成"双峰"型分布,在增大应力同时加剧应力分布的不均匀性,以及降低钢丝绳索具的疲劳寿命。随着波速从(3~6),钢丝绳索具最大应力从140.08增大到307.73,应力变化范围从(112.73~274.52);在预设计疲劳寿命1次情况下,实际使用寿命成"S"型由950000次减小到960次。 Wire rope sling is the key part to the ocean engineering lifting platform on flexible connection, which is often under the condition of the impact of irregular wave, and it is of great significance to study the stress and fatigue life with fluid- structure coupling method of the wire rope sling safety. Based on SOLIDWORKS and ANSYS platform, it builds the analysis model of uniflow fluid-solid coupling of wire rope sling, combing with the virtual fatigue life analysis method, doing finite element analysis on the stress and fatigue life of wire rope sling under the wave impact, meanwhile making a comparison about the characteristic of stress and fatigue life in static load condition, and to provide a theoretical basis for the design and pearmance evaluation of wire rope sling. Through analysis, it is found that the impact of the wave makes the wire rope sling internal stress in to "twin peaks" type distribution, and increases the stress, and contributes to the inhomogeneity of the distribution of stress at the same time, and reduces the fatigue life of wire rope sling; with wave velocity inereases from 3 to 6, the wire rope sling maximum stress inereases from 140.08 to 307.73, the stress ranges from 112.73 to 274.52; in the case of preliminary design life for 1times, the actual service life into "S" type decreases from 950000 to 950 times.
出处 《机械设计与制造》 北大核心 2015年第4期126-128,132,共4页 Machinery Design & Manufacture
基金 广东省教育部产学研合作项目(2012B091000042)
关键词 钢丝绳索具 波浪冲击 流固耦合 应力 疲劳寿命 Wire Rope Sling Wave Impact Fluid-Solid Coupling Stress Fatigue Life
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