摘要
潛艇結(jié)構(gòu)是潛艇水下安全的基礎(chǔ)。隨著現(xiàn)代潛艇下潛深度的不斷增大和各種特殊使用要求的不斷提出，潛艇結(jié)構(gòu)力學(xué)問題日益突出。耐壓圓柱殼結(jié)構(gòu)是潛艇的典型結(jié)構(gòu)。本文的主要目的是研究耐壓圓柱殼結(jié)構(gòu)的極限承載能力。
首先，通過ANSYS有限元軟件對(duì)典型模型進(jìn)行分析計(jì)算，探討用有限元軟件對(duì)耐壓圓柱殼結(jié)構(gòu)進(jìn)行步驟和方法。先建立耐壓圓柱殼模型，對(duì)其進(jìn)行彈性特征值分析。通過特征值分析，可以得到其彈性屈曲值。同時(shí)提取彈性屈曲一階模態(tài)，以一定的缺陷幅值施加到原模型中，從而形成具有初始缺陷的耐壓圓柱殼模型。
通過已建立的三個(gè)典型高強(qiáng)度鋼耐壓圓柱殼模型進(jìn)行彈塑性分析，分析得出模型的塑性極限承載能力，并與理論計(jì)算值進(jìn)行比較。接著進(jìn)行參數(shù)計(jì)算，對(duì)影響高強(qiáng)度耐壓殼的因素進(jìn)行了分析。
之后提出一種新型的高分子夾層耐壓圓柱殼結(jié)構(gòu)。建立與原高強(qiáng)度鋼耐壓圓柱殼模型同尺寸的夾層模型，通過有限元計(jì)算，比較高分子夾層耐壓圓柱殼結(jié)構(gòu)和傳統(tǒng)耐壓圓柱殼結(jié)構(gòu)的極限承載能力差異。通過對(duì)比得出夾層結(jié)構(gòu)的應(yīng)用不會(huì)造成結(jié)構(gòu)承載的降低。而且在達(dá)到一定夾層厚度下，夾層結(jié)構(gòu)相對(duì)高強(qiáng)度鋼結(jié)構(gòu)的承載能力具有一定的優(yōu)勢(shì)。同時(shí)對(duì)夾層結(jié)構(gòu)進(jìn)行了一系列穩(wěn)定性分析。
此外，通過對(duì)不同參數(shù)因子的對(duì)比計(jì)算，得出夾層結(jié)構(gòu)在夾層厚度、肋骨尺寸及肋骨間距等因素影響下的極限承載能力變化規(guī)律。


關(guān)鍵詞：耐壓圓柱殼；極限承載能力；夾層




Abstract
The structure of submarine is the basic of the underwater working safety. The structure mechanical research of submarine has been focused much more as the modern submarine deep submergence increasing and more using requirements being raised. Pressed cylindrical shell is the major structure of submarine. The main purpose of this paper is to research the ultimate bearing capacity of the structure.
Firstly the analysis of several typical models has been made by ANSYS. The approaches and methods are discussed which are used to analyze the pressed cylindrical shell structure. A finite element model is built to analyze the eigenvalue buckling. Through the analysis the elasticity inflection is found and used to upgrade the models as initial defects. Then the pressed cylindrical shell models are built with the initial defects.
Established by the three typical high-strength steel pressure plastic cylindrical shell model analysis of plastic limit analysis model obtained carrying capacity, and compared with the calculated value. Then through the parameter calculation, the influence of high-intensity pressure hull factors is analyzed.
Then it is advanced a new cylindrical shell structure which is made of high polymer sandwich panel. Finite models are established as the geometric parameters of the traditional high steel cylindrical shell models. Through finite element computation, comparison of limit bearing capacity difference is done between high polymer band pressure resistance cylindrical shell structure and traditional pressure resistance cylindrical shell structure. Comparing by calculation in ANSYS, the application of sandwich structure will not result in structural load reduction. In achieves under certain band thickness, the bearing capacity of sandwich structure comparing with that of traditional high strength steel structure has certain superiority. And also the buckling of the structure is analyzed.
In addition, by comparing the different parameters of factor calculated, the influence of the factors as variation of ultimate bearing capacity is researched. These factors include sandwich thickness, rib dimensions and spacing of the ribs.

Keywords: pressed cylinder shell; ultimate bearing capacity; Sandwich panel

目 錄
摘要 I
Abstract I
第1章 緒論 1
1.1 研究背景和意義 1
1.2 國(guó)內(nèi)外研究發(fā)展現(xiàn)狀 3
1.2.1 圓柱殼理論 3
1.2.2 夾層理論 6
1.2.3 初始缺陷理論 8
1.3 主要研究?jī)?nèi)容和研究方法 9
第2章 耐壓圓柱殼理論計(jì)算方法 11
2.1 基本概念和假設(shè) 11
2.2 受力分析 12
2.2.1 殼板強(qiáng)度 14
2.2.2 肋骨強(qiáng)度 15
2.3 穩(wěn)定性分析 15
2.3.1 圓柱殼失穩(wěn)的幾種情況 15
2.3.2 穩(wěn)定性公式 16
2.3.3 計(jì)及肋骨影響的耐壓圓柱殼縱剖面的中面力 17
2.3.4 局部失穩(wěn)和總體失穩(wěn)的理論歐拉載荷 18
2.4 修正系數(shù) 19
2.4.1 幾何修正系數(shù) 19
2.4.2 物理修正系數(shù) 20
2.5 小結(jié) 20
第3章 高強(qiáng)度鋼圓柱殼有限元分析 22
3.1 引言 22
3.2 有限元方法簡(jiǎn)介 22
3.3 非線性問題概述 23
3.3.1 材料非線性 23
3.3.2 幾何非線性 23
3.4 高強(qiáng)度鋼耐壓圓柱殼結(jié)構(gòu)有限元分析 24
3.4.1 耐壓圓柱殼結(jié)構(gòu)有限元分析基本步驟 24
3.4.2 幾何建模及網(wǎng)絡(luò)劃分 24
3.4.3 約束和載荷 27
3.4.4 初始缺陷的施加 27
3.4.5 子步數(shù)和施加的外部載荷值的選擇 27
3.5 高強(qiáng)度鋼耐壓圓柱殼結(jié)構(gòu)有限元計(jì)算分析 27
3.5.1 特征值屈曲分析 27
3.5.2 非線性屈曲計(jì)算 29
3.6 不同計(jì)算方法下塑性極限承載力的比較 31
3.6.1 計(jì)算方法簡(jiǎn)介 31
3.6.2 不同計(jì)算方法結(jié)果對(duì)比 32
3.7 小結(jié) 34
第4章 夾層結(jié)構(gòu)在耐壓圓柱殼結(jié)構(gòu)中的應(yīng)用 36
4.1 引言 36
4.2 夾層結(jié)構(gòu)的構(gòu)造 36
4.3 夾層板的力學(xué)特征 37
4.3.1 夾層理論 38
4.3.2 新型復(fù)合夾層板結(jié)構(gòu)簡(jiǎn)介 39
4.4 夾層圓柱殼的基本方程 40
4.4.1 幾何方程和協(xié)調(diào)方程 40
4.4.2 平衡方程和邊界條件 42
4.5 夾層結(jié)構(gòu)耐壓圓柱殼模型的建立 43
4.5.1 材料和單元 44
4.5.2 網(wǎng)格劃分 44
4.5.3 約束施加..