【摘要】：夾層結(jié)構(gòu)以其優(yōu)異的力學(xué)性能引起了造船界的關(guān)注,其在船舶與海洋工程及航空航天等領(lǐng)域的應(yīng)用范圍逐漸擴大,與船舶常用的帶有扶強材的單一金屬板相比具有重量輕、抗疲勞、結(jié)構(gòu)形式簡單、良好的吸能、抗腐蝕及抗沖擊能力強、空間利用率高、隔振降噪及濾波等優(yōu)點,隨著對SPS夾層結(jié)構(gòu)研究的深入,SPS夾層板大量應(yīng)用于船舶制造將是一種不可阻擋的趨勢。本文以船用SPS為研究對象,通過對船用SPS結(jié)構(gòu)的受力特點及內(nèi)部應(yīng)力場和位移場進(jìn)行分析,在合理假設(shè)的基礎(chǔ)上建立了兩種求解SPS夾層板的數(shù)學(xué)模型,運用大量的經(jīng)典理論和有限元計算結(jié)果對兩種理論進(jìn)行了驗證并運用以上數(shù)學(xué)模型重點研究了船用SPS結(jié)構(gòu)的自由振動、靜態(tài)力學(xué)行為和動態(tài)響應(yīng)問題。此外對SPS夾層板的動靜態(tài)本構(gòu)方程、面/芯脫層問題以及不同SPS夾層板的沖擊動力學(xué)性能進(jìn)行了一定程度的研究。本文重點研究的內(nèi)容和相關(guān)結(jié)論如下:(1)運用板的平衡運動微分方程推導(dǎo)了忽略芯材質(zhì)量慣性的夾層板的控制方程和含芯材質(zhì)量慣性的夾層板的控制方程,運用權(quán)威的數(shù)值實例和經(jīng)典理論及有限元軟件對兩種模型的準(zhǔn)確度和精度進(jìn)行了驗證,在此基礎(chǔ)上對不同面板和芯材厚度的自由振動以及在正弦載荷、均布載荷、集中力載荷等的位移場進(jìn)行了分析。在保證理論模型準(zhǔn)確的情況下對受脈沖載荷、諧振載荷以及多次連續(xù)加載的有阻尼效應(yīng)和無阻尼效應(yīng)的船用SPS夾層結(jié)構(gòu)的動態(tài)響應(yīng)進(jìn)行了分析,探討了質(zhì)量慣性力和阻尼力對SPS夾層結(jié)構(gòu)的影響。(2)在理論分析的基礎(chǔ)上通過實驗研究了高應(yīng)變率下面板鋼、芯材以及鋼/聚氨酯夾層板的準(zhǔn)靜態(tài)和高應(yīng)變率動態(tài)本構(gòu)關(guān)系,得到了能夠準(zhǔn)確描述芯材聚氨酯彈性體和鋼/聚氨酯夾層板高應(yīng)變率下的本構(gòu)方程并通過實驗證明了其精度。(3)由于夾層板較易發(fā)生脫層,根據(jù)夾層板的受力特點以及破壞形式,通過給船用SPS結(jié)構(gòu)設(shè)定一個初始脫層,研究船用SPS夾層結(jié)構(gòu)在脫層損傷下結(jié)構(gòu)的自由振動和動態(tài)響應(yīng)。對比分析了完好夾層板和有脫層夾層板的動態(tài)響應(yīng)。為了方便處理LS-DYNA輸出數(shù)據(jù),作者運用M語言開發(fā)了一個數(shù)據(jù)處理并直觀顯示為三維圖的軟件Figure3D。(4)最后運用LS-DYNA軟件詳細(xì)研究了傳統(tǒng)加筋板、SPS結(jié)構(gòu)及SPS加筋板在低速沖擊下的動態(tài)響應(yīng),對比分析了傳統(tǒng)加筋板、SPS結(jié)構(gòu)和SPS加筋板的自由振動和沖擊動態(tài)響應(yīng)。
[Abstract]:The sandwich structure has attracted the attention of shipbuilding because of its excellent mechanical properties. Its application in marine engineering, aerospace and other fields has been gradually expanded, and it has a light weight compared with the single metal plate with supporting material, which is commonly used in ships. Fatigue resistance, simple structure, good energy absorption, strong corrosion and impact resistance, high space utilization, vibration isolation, noise reduction and filtering, etc. It will be an unstoppable trend for SPS sandwich plates to be widely used in shipbuilding with the further study of SPS sandwich structures. In this paper, taking marine SPS as the research object, by analyzing the mechanical characteristics, internal stress field and displacement field of marine SPS structure, two mathematical models for solving SPS sandwich plate are established on the basis of reasonable assumptions. A large number of classical theories and finite element calculation results are used to verify the two theories and the above mathematical models are used to study the free vibration static mechanical behavior and dynamic response of marine SPS structures. In addition, the static and static constitutive equations of SPS sandwich plates, the surface / core delamination problem and the impact dynamics of different SPS sandwich plates are studied to some extent. The main contents and relevant conclusions of this paper are as follows: (1) the governing equations of the sandwich plate which neglects the inertia of the core mass and the sandwich plate with the inertia of the core mass are derived by using the equilibrium motion differential equation of the plate. The accuracy and accuracy of the two models are verified by using authoritative numerical examples, classical theory and finite element software. On this basis, the free vibration of different face panels and core materials and the distribution of loads under sinusoidal load are uniformly distributed. The displacement field of concentrated load is analyzed. The dynamic responses of marine SPS sandwich structures subjected to pulse load, resonant load and multiple continuous loading with and without damping effect are analyzed under the condition of ensuring the accuracy of the theoretical model. The influence of mass inertia force and damping force on SPS sandwich structure is discussed. (2) based on the theoretical analysis, the quasi-static and high strain rate dynamic constitutive relations of panel steel, core material and steel / polyurethane sandwich plate at high strain rate are studied experimentally. The constitutive equations which can accurately describe the core polyurethane elastomer and steel / polyurethane sandwich plate at high strain rate are obtained and their accuracy is proved by experiments. (3) due to the easy delamination of sandwich plate, according to the mechanical characteristics and failure form of sandwich plate, By setting an initial delamination for marine SPS structure, the free vibration and dynamic response of marine SPS sandwich structure under delamination damage are studied. The dynamic responses of intact sandwich plate and delaminated sandwich plate are compared and analyzed. To facilitate processing of LS-DYNA output data, In this paper, a software Figure3D. (4) is developed by using M language to process data and display 3D graph directly. Finally, the dynamic response of SPS stiffened plate under low speed impact is studied in detail by using LS-DYNA software. The free vibration and shock dynamic responses of the traditional stiffened SPS structure and the SPS stiffened plate are compared and analyzed.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U661.43

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 宋力,胡時勝;SHPB數(shù)據(jù)處理中的二波法與三波法[J];爆炸與沖擊;2005年04期

2 袁秦魯;李玉龍;李賀軍;;碳布疊層/碳復(fù)合材料動態(tài)壓縮性能測試研究[J];爆炸與沖擊;2007年06期

3 葉仁傳;田阿利;沈超明;;霍普金森壓桿(SHPB)實驗波形振蕩問題的影響與解決方法[J];科學(xué)技術(shù)與工程;2014年01期

4 王自力,顧永寧;應(yīng)變率敏感性對船體結(jié)構(gòu)碰撞性能的影響[J];上海交通大學(xué)學(xué)報;2000年12期

5 劉云川;竇金龍;汪旭光;;沖擊壓縮載荷作用下楊木的力學(xué)性能研究[J];振動與沖擊;2009年04期

相關(guān)碩士學(xué)位論文 前1條

1 周紅;沖擊載荷下SPS夾層板系統(tǒng)損傷特性研究[D];江蘇科技大學(xué);2013年

，

本文編號：2251697