【摘要】：隨著海洋油氣資源開發(fā)向深海和超深海邁進,海底油氣管道無疑面臨著更大的風險與挑戰(zhàn),深海巨大的靜水壓力和低溫環(huán)境對海底管道的承壓能力,抗腐蝕能力和保溫隔熱能力都有較高要求。而傳統(tǒng)單層管已無法滿足深水和超深水海域管道的承載力和安全輸運要求。一種新型的夾層管復合結構以其在深海油氣資源開發(fā)和輸運領域的顯著的優(yōu)勢受到人們的廣泛關注。深海油氣管道在鋪設和服役期間,需要承受軸向拉力、彎曲和外部高靜水壓力作用。夾層管的材料非線性和幾何非線性加大了管道受力的復雜性,復雜的外部荷載下管道極易發(fā)生局部屈曲,屈曲沿管道軸向傳遞,導致管道的整體失穩(wěn)破壞。夾層管復合結構在深海油氣資源運輸領域具有巨大的前景,對其在復雜荷載作用下的屈曲失穩(wěn)機理展開研究具有重大的現(xiàn)實意義.本文通過試驗測得夾芯層與內外管之間的黏結性能,并與數值模擬方法得到的結果進行對比。在考慮不同的層間黏結性能的基礎上,對夾層管在復雜荷載組合作用下的屈曲失穩(wěn)進行較為精確的數值模擬分析,具體研究工作主要為以下幾個方面：(1)夾層管的層間黏結性能研究。本文通過剪切試件拉伸試驗和夾層管段試件軸向推出試驗,在接觸面光滑和粗糙條件下,分別獲得采用環(huán)氧樹脂膠和3M-DP8005膠粘接的層間切應力-位移關系曲線。利用通用有限元軟件ABAQUS分別建立兩種試驗的有限元模型,模擬試驗過程進行計算,并與試驗結果進行對比。(2)軸向拉力與彎曲組合作用下夾層管復合結構屈曲失穩(wěn)研究。建立了夾層管復合結構在彎曲與拉力組合作用下的數值模型,采用節(jié)點間的非線性彈簧單元模擬夾層管軸向和環(huán)向的層間黏結性能,通過廣泛的參數化分析,系統(tǒng)地闡述了加載路徑、層間黏結性能、截面幾何構型以及材料特性等因素對夾層管屈曲失穩(wěn)的影響。(3)靜水壓力與彎曲組合作用下夾層管復合結構屈曲失穩(wěn)研究。建立了夾層管復合結構在靜水壓力與彎曲組合作用下的數值模型,通過一系列參數敏感性分析,研究了加載路徑、層間黏結性能、截面幾何構型以及材料特性等因素對該荷載組合作用下夾層管屈曲失穩(wěn)的影響機理。研究結果表明,復雜荷載組合作用下,加載路徑對夾層管屈曲性能影響較為顯著；相比傳統(tǒng)單層管,夾層管的屈曲性能有較大幅度的提升；與截面初始幾何缺陷相比,夾層管截面幾何構型和內外管材料特性對夾層管屈曲性能影響較大。
[Abstract]:As the exploitation of offshore oil and gas resources moves towards the deep sea and the ultra deep sea, the submarine oil and gas pipelines are undoubtedly facing greater risks and challenges. The huge hydrostatic pressure in the deep sea and the pressure bearing capacity of the low temperature environment on the submarine pipelines, Corrosion resistance and thermal insulation have higher requirements. However, the traditional single-layer pipe can not meet the requirements of carrying capacity and safe transportation of pipelines in deep water and ultra deep water. A new sandwich pipe composite structure has attracted wide attention due to its remarkable advantages in the exploitation and transportation of deep-sea oil and gas resources. Deep-sea oil and gas pipelines need to be subjected to axial tension, bending and external high hydrostatic pressure during laying and service. The material nonlinearity and geometric nonlinearity of sandwich pipes increase the complexity of pipeline stress. The local buckling of pipes is easy to occur under complex external loads, and the buckling is transmitted along the pipeline axis, which leads to the overall instability and failure of pipelines. Sandwich pipe composite structure has a great prospect in the field of deep-sea oil and gas resource transportation. It is of great practical significance to study the buckling instability mechanism of sandwich pipe composite structure under complex loads. In this paper, the bonding properties between the sandwich layer and the inner and outer tubes are measured by experiments, and the results are compared with the results obtained by the numerical simulation method. On the basis of considering different interlaminar bonding properties, the buckling instability of sandwich tubes under complex load combination is analyzed by numerical simulation. The main works are as follows: (1) the interlaminar bonding properties of sandwich tubes. In this paper, the shear stress-displacement curves of epoxy resin adhesive and 3M-DP8005 adhesive are obtained under the condition of smooth and rough contact surface by tensile test of shear specimen and axial extrapolation test of sandwich tube piece. The finite element models of the two kinds of tests were established by using the universal finite element software ABAQUS, and the results were calculated by simulating the test process. (2) the buckling instability of sandwich tube composite structures under the combined action of axial tension and bending was studied. The numerical model of sandwich tube composite structure under the combination of bending and tension is established. The nonlinear spring element between nodes is used to simulate the interlaminar bonding performance of the sandwich tube in the axial and circumferential directions, and a wide range of parameterized analysis is carried out. The effects of loading path, interlaminar bonding properties, cross-section geometry and material characteristics on buckling instability of sandwich tube are systematically discussed. (3) buckling instability of sandwich tube composite structure under the combination of hydrostatic pressure and bending. The numerical model of sandwich tube composite structure under the combination of hydrostatic pressure and bending is established. Through a series of parameter sensitivity analysis, the loading path and interlaminar bonding properties are studied. The effect of geometrical configuration of section and material characteristics on buckling instability of sandwich tubes under the combined loads is investigated. The results show that the load path has a significant effect on the buckling behavior of sandwich tubes under the complex load combination, and the buckling behavior of sandwich tubes is greatly improved compared with the traditional single-layer tubes. Compared with the initial geometric defects of the sandwich tube, the geometric configuration of the sandwich tube section and the characteristics of the inner and outer tube materials have great influence on the buckling performance of the sandwich tube.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TE973

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