發(fā)布時間：2018-07-29 13:48

【摘要】：耐壓結(jié)構(gòu)是潛艇、潛器等得以順利開展工作的載體和保障,鈦合金以其具有高比強度、耐腐蝕、低磁性等諸多優(yōu)點,在深海耐壓結(jié)構(gòu)中替代傳統(tǒng)材料有明顯的優(yōu)勢。然而,相對于傳統(tǒng)的鋼制耐壓結(jié)構(gòu),鈦合金的蠕變問題不容忽視。本文通過鈦絲懸掛拉伸試驗、理論推導(dǎo)、數(shù)值分析和模型試驗等途徑,研究了鈦合金及鈦合金結(jié)構(gòu)的常溫蠕變特性,取得了以下主要成果:1、通過常溫懸掛拉伸試驗,測試不同應(yīng)力狀態(tài)下鈦合金絲蠕變變形隨時間的變化規(guī)律,證實了常溫蠕變與中高溫蠕變的顯著差異,選取了適用于鈦合金常溫蠕變的蠕變本構(gòu)關(guān)系,并擬合蠕變參數(shù),是進行深海耐壓結(jié)構(gòu)蠕變計算的前提。2、用數(shù)值方法分析了球殼和環(huán)肋圓柱殼的蠕變特性,通過系列計算給出了可供參考的蠕變變形和應(yīng)力重分布特征,著重分析了肋骨形式和截面尺寸對環(huán)肋圓柱殼蠕變特性的影響,并初步研究了當(dāng)模型存在初始幾何缺陷或開孔時蠕變對幾何缺陷幅值和穩(wěn)定性的影響。3、基于一般方程,首次給出了環(huán)肋圓柱殼結(jié)構(gòu)殼板和肋骨腹板蠕變變形及應(yīng)力重分布的瞬態(tài)解,能夠與數(shù)值解較好的吻合,為理論分析環(huán)肋圓柱殼蠕變特征提供了基礎(chǔ)。4、本文設(shè)計了一種耐壓結(jié)構(gòu)蠕變測試方法,首次開展了鈦合金環(huán)肋圓柱殼模型外壓蠕變試驗。首次測得了TC4鈦合金耐壓結(jié)構(gòu)的壓縮蠕變,并與數(shù)值計算結(jié)果進行對比,初步驗證了數(shù)值計算的可靠性,為耐壓結(jié)構(gòu)蠕變研究提供了新方法。
[Abstract]:The pressure resisting structure is the carrier and guarantee for the submarine, submarine and so on to carry out the work smoothly. Because of its high specific strength, corrosion resistance, low magnetism and so on, titanium alloy has obvious advantage in replacing the traditional material in the deep sea pressure resisting structure. However, the creep problem of titanium alloy can not be ignored compared with the traditional steel structure. In this paper, the creep properties of titanium alloy and titanium alloy structure at room temperature are studied by means of tensile test, theoretical derivation, numerical analysis and model test of titanium wire suspension. The following main achievements have been obtained: 1, and through the tensile test of hanging tension at room temperature, the creep behavior of titanium alloy and titanium alloy structure has been studied. The variation of creep deformation of titanium alloy wire with time under different stress states is tested, and the significant difference between normal temperature creep and moderate high temperature creep is confirmed. The creep constitutive relation suitable for normal temperature creep of titanium alloy is selected and the creep parameters are fitted. The creep characteristics of spherical shell and circular cylindrical shell are analyzed by numerical method, and the creep deformation and stress redistribution characteristics for reference are given through a series of calculations. The influence of rib form and section size on creep behavior of circular cylindrical shell is analyzed, and the influence of creep on the amplitude and stability of circular cylindrical shell is studied when there are initial geometric defects or holes in the model. For the first time, the transient solution of creep deformation and stress redistribution of shell plate and rib web plate of ring-ribbed cylindrical shell structure is presented, which is in good agreement with the numerical solution. In this paper, a creep test method for pressure resistant structure is designed, and the creep test of titanium alloy cylindrical shell model under external pressure is carried out for the first time. The compressive creep of TC4 titanium alloy is measured for the first time, and the results are compared with the numerical results. The reliability of the numerical calculation is preliminarily verified, which provides a new method for the study of the creep of the compressive structure.
【學(xué)位授予單位】：中國艦船研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U661.42

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本文編號：2152871