考虑小裂纹和保载时间效应的疲劳可靠性分析（英文）

发布时间：2018-06-19 19:28

本文选题：不确定性 + 疲劳可靠性分析　；参考：《船舶力学》2016年06期

【摘要】：大深度载人潜水器的载人舱材质是高强度金属,不可避免地会受到疲劳损害现象的挑战。实际的载人舱结构中存在着由外部因素和内部因素引起的不确定性,其疲劳寿命将受到这些不确定性的影响。在前期的研究中,课题组基于统一的疲劳裂纹扩展率模型进行了疲劳可靠性分析方法的探讨,可作为进一步进行载人舱疲劳寿命预报的基础。但是,该模型无法反映小裂纹和保载时间的影响,而这正是载人舱结构和所受载荷的重要特征,应进行深入研究。所以,课题组提出了一个小裂纹扩展率模型和两个反映保载时间效应的裂纹扩展率模型,以更好地解释载人舱用钛合金金属的蠕变疲劳特性。文中基于这三个模型,结合不同的理论方法,进行了疲劳可靠性分析,考察了可靠度分析方法之间的不同、输入参数以及不同的裂纹扩展理论模型对结构的疲劳可靠性的影响。
[Abstract]:The material of manned capsule of deep manned submersible is high strength metal, which will inevitably be challenged by fatigue damage. There are uncertainties caused by external and internal factors in the actual manned cabin structure, and their fatigue life will be affected by these uncertainties. In the previous study, the method of fatigue reliability analysis based on the unified fatigue crack growth rate model is discussed, which can be used as the basis for further prediction of fatigue life of manned cabin. However, the model can not reflect the influence of small crack and loading time, which is the important characteristic of the structure and load of manned cabin, which should be studied deeply. Therefore, a small crack growth rate model and two crack growth rate models reflecting the loading time effect are proposed to better explain the creep fatigue characteristics of titanium alloy used in manned cabin. Based on these three models and different theoretical methods, fatigue reliability analysis is carried out, and the influences of different reliability analysis methods, input parameters and different crack growth theory models on fatigue reliability of structures are investigated.
【作者单位】：中国船舶科学研究中心;中国船舶科学研究中心深海载人装备国家重点实验室;上海海洋大学海洋科学学院上海深渊科学工程技术研究中心;
【基金】：Supported by the National Hi-tech Research and Development Plan(863 Plan)Project of China(Grant No.2014AA09A110) the Sci-tech Innovation Funds from CSSRC(Grant No.G3314) the State Key Program of National Natural Science of China ‘Structural Reliability Analysis on the Spherical Hull of Deep-sea Manned Submersibles’(Grant No.51439004)
【分类号】：U661.4

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