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

【摘要】：螺栓連接結(jié)構(gòu)所受到的切向載荷會引起組件結(jié)合界面的水平滑移,進而產(chǎn)生顯著的能量耗散。針對連接結(jié)構(gòu)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(jié)構(gòu)振動響應(yīng),增強結(jié)構(gòu)的壽命和可靠性具有重要的意義。對連接結(jié)構(gòu)能量耗散機制研究的進一步的目標(biāo)是實現(xiàn)連接阻尼的預(yù)示,逐漸擺脫對整機試驗的依賴,加速產(chǎn)品的研發(fā)進程并降低產(chǎn)品的研發(fā)成本。本文采用理論數(shù)值研究和試驗相結(jié)合的方法,對搭接連接能耗機理和連接結(jié)構(gòu)阻尼預(yù)示進行了系統(tǒng)研究,主要研究內(nèi)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(yīng)。分別從黏著-滑移轉(zhuǎn)換、界面應(yīng)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(shù)。利用響應(yīng)面法和遺傳算法,以試驗獲得的載荷-位移曲線結(jié)果為基準,識別出了有限元模型中的不確定參數(shù)。利用含有所識別參數(shù)數(shù)值的有限元模型,對不同預(yù)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(jié)構(gòu)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(guān)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(jié)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(shù)。將其應(yīng)用于螺栓連接組合結(jié)構(gòu),利用應(yīng)變能法得到了結(jié)構(gòu)的各階模態(tài)阻尼,并與試驗結(jié)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(jié)構(gòu)動力學(xué)預(yù)示方法。以非線性材料的本構(gòu)模型為基礎(chǔ),根據(jù)孤立搭接連接的載荷-位移關(guān)系識別了材料參數(shù),對一個含有搭接連接的結(jié)構(gòu)進行了動力學(xué)試驗和數(shù)值計算,進一步驗證了結(jié)構(gòu)的非線性特性以及預(yù)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(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TH131.3

【參考文獻】

相關(guān)期刊論文 前2條

1 肖會芳;邵毅敏;徐金梧;;粗糙界面法向接觸振動響應(yīng)與能量耗散特性研究[J];振動與沖擊;2014年04期

2 李以農(nóng),鄭玲,聞邦椿;螺栓接頭非線性模型及其波能耗散[J];振動工程學(xué)報;2003年02期

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本文編號：1752088