本文選題：螺栓連接 + 搭接�。� 參考：《北京理工大學》2016年博士論文

【摘要】：螺栓連接結構所受到的切向載荷會引起組件結合界面的水平滑移,進而產生顯著的能量耗散。針對連接結構的能量損耗機理開展研究,充分理解連接阻尼的影響因素,對于有效利用連接來降低結構振動響應,增強結構的壽命和可靠性具有重要的意義。對連接結構能量耗散機制研究的進一步的目標是實現連接阻尼的預示,逐漸擺脫對整機試驗的依賴,加速產品的研發(fā)進程并降低產品的研發(fā)成本。本文采用理論數值研究和試驗相結合的方法,對搭接連接能耗機理和連接結構阻尼預示進行了系統(tǒng)研究,主要研究內容如下:建立了適用于研究螺栓搭接連接微滑的一維連續(xù)體模型,計算得到了模型的微滑響應。分別從黏著-滑移轉換、界面應力分布、載荷-位移曲線以及周期能耗等方面詳細闡述了不同的界面特性和壓力分布形式對螺栓搭接連接微滑及能量損耗的影響。建立了螺栓搭接連接的有限元模型,并詳細描述了模型中需要識別的參數。利用響應面法和遺傳算法,以試驗獲得的載荷-位移曲線結果為基準,識別出了有限元模型中的不確定參數。利用含有所識別參數數值的有限元模型,對不同預緊力和載荷作用下的螺栓連接的能量損耗規(guī)律進行了計算研究。建立了基于接觸分析的螺栓連接結構的有限元模型并對其進行了模態(tài)分析計算。將模態(tài)振型相關的位移場施加在有限元模型上,計算得到了各階摩擦能耗和模態(tài)阻尼,并將試驗和仿真的結果進行了對比分析。借助于所搭建的啞鈴式搭接連接試驗臺,通過測試得到了模擬界面的薄層單元的剛度和阻尼參數。將其應用于螺栓連接組合結構,利用應變能法得到了結構的各階模態(tài)阻尼,并與試驗結果進行了對比。提出一種基于非線性材料薄層單元的螺栓連接結構動力學預示方法。以非線性材料的本構模型為基礎,根據孤立搭接連接的載荷-位移關系識別了材料參數,對一個含有搭接連接的結構進行了動力學試驗和數值計算,進一步驗證了結構的非線性特性以及預示仿真的可靠性。
[Abstract]:The tangential load on the bolted structure will lead to horizontal slip of the interface of the assembly, which will result in significant energy dissipation.It is of great significance to study the energy loss mechanism of the connection structure and fully understand the influencing factors of the connection damping, which is of great significance for the effective use of the connection to reduce the vibration response of the structure and to enhance the life and reliability of the structure.The further goal of the study on energy dissipation mechanism of connection structure is to realize the prediction of connection damping, gradually get rid of the dependence on the whole machine test, accelerate the process of product development and reduce the cost of product research and development.In this paper, the energy consumption mechanism and the damping prediction of the connection structure are systematically studied by combining the theoretical numerical research with the experimental method.The main research contents are as follows: a one-dimensional continuum model suitable for the study of micro-slip of bolt lap joint is established, and the micro-slip response of the model is calculated.The effects of different interface characteristics and pressure distribution on the micro-slip and energy loss of bolt lap joint are discussed in detail from the aspects of adhesion and slip conversion, interfacial stress distribution, load-displacement curve and periodic energy consumption.The finite element model of bolt lap connection is established, and the parameters to be identified in the model are described in detail.Based on the response surface method and genetic algorithm, the uncertain parameters in the finite element model are identified based on the load-displacement curve obtained from the experiment.Based on the finite element model with identified parameters, the energy loss law of bolted joints under different pretightening forces and loads is calculated and studied.The finite element model of bolted connection structure based on contact analysis was established and the modal analysis was carried out.The displacement field related to modal mode is applied to the finite element model and the friction energy consumption and modal damping of each order are calculated. The results of experiment and simulation are compared and analyzed.The stiffness and damping parameters of the thin layer element of the simulated interface are obtained by means of the dumbbell type lap joint test rig.This method is applied to bolted composite structure, and the damping modes of the structure are obtained by strain energy method, and the results are compared with the experimental results.A dynamic prediction method of bolted connection structure based on nonlinear material thin-layer element is proposed.Based on the constitutive model of nonlinear materials, the material parameters are identified according to the load-displacement relationship of isolated lap joints, and the dynamic tests and numerical calculations of a structure with lap connections are carried out.The nonlinear characteristics of the structure and the reliability of the prediction simulation are further verified.
【學位授予單位】：北京理工大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TH131.3

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本文編號：1752088