【摘要】：作為新型的復(fù)合材料結(jié)構(gòu)件制造技術(shù),自動(dòng)鋪放具有高生產(chǎn)質(zhì)量、高生產(chǎn)效率以及低人工成本等優(yōu)勢(shì)。目前,對(duì)于碳纖維復(fù)合材料鋪放工藝的研究工作主要集中于兩方面,一方面是對(duì)于復(fù)合材料鋪放軌跡研究,另一方面則是復(fù)合材料自動(dòng)鋪放工藝參數(shù)優(yōu)化研究。因此,本文主要從這兩大主要研究方向入手,探究了主應(yīng)力鋪放軌跡對(duì)開孔層合板力學(xué)性能的影響以及鋪放工藝參數(shù)對(duì)層合板層間性能的影響,并進(jìn)行了相關(guān)的數(shù)值模擬和試驗(yàn)驗(yàn)證,同時(shí),為進(jìn)一步探索碳纖維復(fù)合材料的鋪放工藝奠定了基礎(chǔ)。首先簡(jiǎn)要論述了樹脂基復(fù)合材料以及復(fù)合材料自動(dòng)鋪放技術(shù),重點(diǎn)介紹了變剛度復(fù)合材料設(shè)計(jì)方法、復(fù)合材料鋪放工藝參數(shù)優(yōu)化、復(fù)合材料開孔板漸進(jìn)損傷失效分析及其國(guó)內(nèi)外研究現(xiàn)狀。結(jié)合最大主應(yīng)力鋪放軌跡設(shè)計(jì)方法和自動(dòng)鋪放工藝參數(shù)優(yōu)化,提出了課題的研究背景與意義。最后,給出了本文的研究?jī)?nèi)容和結(jié)構(gòu)框架。其次論述了復(fù)合材料力學(xué)相關(guān)基礎(chǔ)理論,對(duì)于單一角度鋪層的應(yīng)力應(yīng)變關(guān)系進(jìn)行了簡(jiǎn)要概述,并基于單一角度鋪層應(yīng)力應(yīng)變關(guān)系推導(dǎo)得出了變角度纖維層合板應(yīng)力應(yīng)變關(guān)系。最后簡(jiǎn)要介紹了幾種常見的內(nèi)聚力模型的本構(gòu)關(guān)系,為后續(xù)變剛度層合板的設(shè)計(jì)及損傷失效分析,短梁剪切層間性能分析奠定基礎(chǔ)。針對(duì)復(fù)合材料開孔板鋪放軌跡進(jìn)行了研究,利用B樣條曲線插值擬合獲取了開孔板最大主應(yīng)力鋪放軌跡并通過離散網(wǎng)格法建立了變剛度開孔板模型,通過引入Tsai-Wu損傷失效判據(jù)以及常剛度退化準(zhǔn)則,進(jìn)行了拉伸失效數(shù)值模擬及損傷失效分析,并分別鋪放了兩組常剛度、變剛度開孔板試驗(yàn)樣件,進(jìn)行了拉伸對(duì)比試驗(yàn)。采用試驗(yàn)與數(shù)值模擬相結(jié)合的手段,探索不同鋪放壓力與復(fù)合材料層間性能之間的關(guān)系。建立包含內(nèi)聚力單元的短梁剪切有限元模型,利用Linde提出的損傷失效判據(jù),研究不同壓力條件下短梁剪切試驗(yàn)的損傷演化過程及機(jī)理,同時(shí),利用熱壓罐、鋪放平臺(tái)、萬(wàn)能試驗(yàn)機(jī)等試驗(yàn)設(shè)備進(jìn)行了短梁剪切試驗(yàn),并與仿真結(jié)果進(jìn)行了對(duì)比分析。最后對(duì)本文的研究?jī)?nèi)容作了總結(jié),對(duì)需進(jìn)一步研究的內(nèi)容進(jìn)行了展望。
[Abstract]:As a new manufacturing technology of composite structure parts, automatic laying has the advantages of high production quality, high production efficiency and low labor cost. At present, the research work on the laying process of carbon fiber composites mainly focuses on two aspects: on the one hand, the research on the placement track of the composites, on the other hand, the optimization of the process parameters of the automatic placement of carbon fiber composites. Therefore, starting from these two main research directions, this paper mainly explores the influence of principal stress laying track on the mechanical properties of porous laminated plates and the influence of paving process parameters on the interlaminar properties of laminated plates. The related numerical simulation and experimental verification are carried out, and the foundation is laid for further exploration of the laying process of carbon fiber composites. Firstly, the resin matrix composites and the automatic placement technology of composite materials are briefly discussed, with emphasis on the design method of variable stiffness composites and the optimization of composite laying process parameters. Progressive damage failure analysis of composite porous plates and its research status at home and abroad. Combined with the design method of maximum principal stress paving trajectory and the optimization of automatic laying process parameters, the research background and significance of the subject are put forward. Finally, the research content and structure framework of this paper are given. Secondly, the basic theory of composite mechanics is discussed, the stress-strain relationship of single angle lamination is briefly summarized, and the stress-strain relationship of fiber laminated plate with variable angle is derived based on the stress-strain relationship of single angle lamination. Finally, the constitutive relations of several common cohesion models are briefly introduced, which lays a foundation for the subsequent design, damage and failure analysis of laminated plates with variable stiffness and the analysis of shear interlaminar properties of short beams. In this paper, the paving trajectory of composite orifice plate is studied, and the maximum principal stress paving trajectory of open hole plate is obtained by B-spline curve interpolation fitting, and the model of variable stiffness orifice plate is established by discrete grid method. By introducing Tsai-Wu damage failure criterion and constant stiffness degradation criterion, the numerical simulation of tensile failure and damage failure analysis are carried out, and two groups of constant stiffness and variable stiffness orifice plate test samples are laid out respectively, and the tensile contrast test is carried out. The relationship between different laying pressure and interlaminar properties of composites was explored by means of experiment and numerical simulation. The finite element model of short beam shear including cohesion element is established. The damage evolution process and mechanism of short beam shear test under different pressure conditions are studied by using the damage failure criterion proposed by Linde. At the same time, the hot pressure tank is used to lay the platform. The short beam shear test was carried out by universal testing machine and other test equipment, and the results were compared with the simulation results. Finally, the research contents of this paper are summarized, and the contents that need to be further studied are prospected.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332;TQ342.742

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