本文選題：不確定性 + 疲勞可靠性分析��； 參考：《船舶力學(xué)》2016年06期

【摘要】：大深度載人潛水器的載人艙材質(zhì)是高強(qiáng)度金屬,不可避免地會(huì)受到疲勞損害現(xiàn)象的挑戰(zhàn)。實(shí)際的載人艙結(jié)構(gòu)中存在著由外部因素和內(nèi)部因素引起的不確定性,其疲勞壽命將受到這些不確定性的影響。在前期的研究中,課題組基于統(tǒng)一的疲勞裂紋擴(kuò)展率模型進(jìn)行了疲勞可靠性分析方法的探討,可作為進(jìn)一步進(jìn)行載人艙疲勞壽命預(yù)報(bào)的基礎(chǔ)。但是,該模型無(wú)法反映小裂紋和保載時(shí)間的影響,而這正是載人艙結(jié)構(gòu)和所受載荷的重要特征,應(yīng)進(jìn)行深入研究。所以,課題組提出了一個(gè)小裂紋擴(kuò)展率模型和兩個(gè)反映保載時(shí)間效應(yīng)的裂紋擴(kuò)展率模型,以更好地解釋載人艙用鈦合金金屬的蠕變疲勞特性。文中基于這三個(gè)模型,結(jié)合不同的理論方法,進(jìn)行了疲勞可靠性分析,考察了可靠度分析方法之間的不同、輸入?yún)?shù)以及不同的裂紋擴(kuò)展理論模型對(duì)結(jié)構(gòu)的疲勞可靠性的影響。
[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.
【作者單位】： 中國(guó)船舶科學(xué)研究中心;中國(guó)船舶科學(xué)研究中心深海載人裝備國(guó)家重點(diǎn)實(shí)驗(yàn)室;上海海洋大學(xué)海洋科學(xué)學(xué)院上海深淵科學(xué)工程技術(shù)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)
【分類號(hào)】：U661.4

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