本文選題：鈦合金球殼 + 單一曲線模型�。� 參考：《中國造船》2016年01期

【摘要】：以載人深潛器鈦合金耐壓球殼為研究對象,建立裂紋體有限元模型,并采用張開位移法計算球殼典型開口焊趾處的表面裂紋應力強度因子。裂紋擴展率單一曲線模型能計及負應力比效應。基于該模型對球殼的疲勞壽命進行分析,探討球殼開口焊趾表面裂紋形狀的演化規(guī)律,并對初始裂紋尺寸、臨界裂紋尺寸、殘余應力、應力強度因子幅值門檻和相關的材料參數(shù)進行了敏感性分析,相關結(jié)論可為鈦合金耐壓球殼的設計提供參考。
[Abstract]:The finite element model of the crack body was established by taking the pressure resistant spherical shell of titanium alloy for the manned deep submersible vehicle as the research object, and the stress intensity factor of the surface crack at the typical open toe of the spherical shell was calculated by using the opening displacement method. The single curve model of crack growth rate can take into account the negative stress ratio effect. Based on the model, the fatigue life of spherical shell is analyzed, and the evolution law of the surface crack shape of welded toe is discussed, and the initial crack size, critical crack size and residual stress are also discussed. The sensitivity analysis of the stress intensity factor amplitude threshold and the related material parameters is carried out. The relevant conclusions can be used as a reference for the design of titanium alloy pressure resistant spherical shell.
【作者單位】： 上海交通大學海洋工程國家重點實驗室;高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心;
【基金】：國家高技術(shù)研究發(fā)展計劃(863)項目(2009AA093303)
【分類號】：U661.4

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