本文關(guān)鍵詞：單搭接件力學(xué)性能研究　出處：《浙江大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 搭接件 鉚釘 釘傳載荷 干涉量 有限元

【摘要】：對于飛機(jī)裝配來說,搭接接頭是關(guān)鍵部位,大約有85%的破壞都發(fā)生在鉚接和螺栓連接等機(jī)械連接部位。在搭接接頭的多排鉚釘結(jié)構(gòu)中,每個(gè)鉚釘?shù)某休d比例存在差異,從干涉量的角度對單搭接件釘傳載荷均化問題進(jìn)行系統(tǒng)研究,在均化釘傳載荷的基礎(chǔ)上,使通過干涉量優(yōu)化搭接件危險(xiǎn)區(qū)域應(yīng)力和提高搭接件承載能力成為可能。針對搭接件力學(xué)性能優(yōu)化問題,本文進(jìn)行了如下研究工作。首先,分析了鉚接過程,對鉚接后孔周殘余應(yīng)力簡化計(jì)算公式進(jìn)行了研究,為之后仿真結(jié)果提供對比,進(jìn)一步研究了內(nèi)外側(cè)板件不同的孔擴(kuò)張量對搭接件變形的影響。其次,分析了載荷從一個(gè)板件通過鉚釘傳遞給另一個(gè)板件的過程中,存在的傳遞方式和力的類型。借助鉚釘柔度的概念理論研究了多釘搭接件承載時(shí)的各釘承載比例,在此基礎(chǔ)上預(yù)測了搭接件受拉伸載荷時(shí)的危險(xiǎn)區(qū)域。接著,設(shè)計(jì)了三個(gè)不同的優(yōu)化方案:1)不同的下壓量;2)相同的釘孔直徑,不同的鉚釘直徑;3)相同的鉚釘直徑,不同的釘孔直徑;通過ABAQUS建立搭接件模型,進(jìn)行三個(gè)方案的鉚接和拉伸過程仿真。最后,對不同下壓量組進(jìn)行了搭接件力學(xué)性能試驗(yàn)驗(yàn)證。本文的主要研究成果包括:(1)通過建立搭接件的有限元模型,對不同釘載均化設(shè)計(jì)方案進(jìn)行了鉚接和拉伸過程的有限元仿真。開展了不同下壓量和配合間隙的鉚接仿真結(jié)果分析,并總結(jié)了孔周殘余應(yīng)力分布隨不同參數(shù)變化的規(guī)律。對不同下壓量和配合間隙的拉伸仿真結(jié)果進(jìn)行釘傳載荷比例和應(yīng)力分布分析,對比了不同優(yōu)化方案的優(yōu)劣。(2)不同下壓量的組合進(jìn)行了力學(xué)性能試驗(yàn),在危險(xiǎn)點(diǎn)和關(guān)鍵截面上貼應(yīng)變進(jìn)行實(shí)時(shí)應(yīng)變監(jiān)測。對采集的數(shù)據(jù)結(jié)果進(jìn)行危險(xiǎn)點(diǎn)應(yīng)力應(yīng)變情況和關(guān)鍵截面?zhèn)髁厔莘治?分析結(jié)果驗(yàn)證了仿真模型的正確與有效。(3)仿真和試驗(yàn)都證實(shí)了:首先對于鉚釘而言,通過合理控制三個(gè)鉚釘?shù)南聣毫?能夠?qū)崿F(xiàn)單搭接件在受拉伸載荷時(shí)鉚釘均勻的受載,有利于減小兩端鉚釘?shù)淖畲髴?yīng)力,提高搭接件鉚釘?shù)某休d能力。其次對于板件而言,通過合理控制三個(gè)鉚釘?shù)南聣毫?可以減小搭接件的內(nèi)外側(cè)板受拉伸載荷時(shí)危險(xiǎn)區(qū)域的最大應(yīng)力,最大程度地使搭接板內(nèi)各截面應(yīng)力分布趨于均勻,提高了單搭接件內(nèi)外側(cè)板的承載能力。(4)對于沉頭孔三釘單搭接件而言,三個(gè)鉚釘最合適的下壓量組合是:中間鉚釘下壓量比兩側(cè)鉚釘?shù)南聣毫看?固定端鉚釘?shù)南聣毫可员攘硪欢算T釘?shù)南聣毫看蟆?br/>[Abstract]:For aircraft assembly, the lap joint is the key part, about 85% of the damage occurred in the riveting and bolt connecting mechanical joints. Multi row rivet structure in lap joints, the bearing ratio of each rivet are different, both the problem of systematic study of single lap joint pin load from interference angle based on the homogenization, pin loads on the bearing capacity, improve lap joints made possible through interference optimization of dangerous area of lap joints stress and mechanical properties of joints. Aiming at the optimization problem, this paper carries out the following research work. Firstly, analyzed the process of riveting, riveting of residual stress after Kong Zhou formula is studied, the simulation results provide for comparison, further study of the inner and outer side hole expansion of lap joints deformation. Secondly, analyzes the load from a plate with rivets Transfer to another plate, the transmission and the type of existence. The concept of using the theory of rivet flexibility on the nail joints when loading the pin load distribution, based on the prediction of lap joints under tension load when the danger zone. Then, we design three different optimization solution: 1) under different pressure volume; 2) nail holes of the same diameter, different diameter of rivet; 3) the same diameter of rivet, screw holes of different diameters; establish lap joints model through ABAQUS simulation, riveting and tensile process of three schemes. Finally, under the pressure of different weight groups were the mechanical properties of lap joints test. The main achievements of this paper include: (1) by establishing a finite element model of lap joints, different pin load equalization scheme is analyzed by finite element simulation. The riveting and stretching process was carried out and the clearance of riveting pressure under different The analysis of simulation results, and summarizes the Kong Zhou residual stress distribution changes with different parameters. Simulation on tensile compression and clearance results under different of pin load ratio and stress distribution analysis, comparison of different optimization schemes. (2) the mechanical properties of test group was different under pressure together, with strain in the dangerous point and the key section of real-time monitoring of dangerous points. The strain analysis of stress and strain and force transmission of key sections trend of collected data results, analysis results validate the simulation model is correct and effective. (3) simulation and experiment have confirmed: first for rivets, through reasonable control of the three Rivet Press amount, can achieve single lap joints under tensile load when the rivet uniform loading, is conducive to the maximum stress decreases at both ends of a rivet, improve the bearing capacity of joints. Secondly for the plate rivet Three, through the reasonable control of the rivet press amount, can reduce the inner and outer side of lap joints under tensile load when the dangerous area of maximum stress, maximum makes each section plate internal stress distribution tends to be uniform, improve the bearing capacity of the single lap joints of inner and outer side. (4) for countersunk hole three nail single lap joints, three rivets the most suitable load combination is: intermediate Rivet Press amount than the two rivets under the pressure of large amount; slightly more than the other end of the rivet is under the pressure of large amount of pressure volume fixed end of the rivet.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V262.4;V215

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本文編號(hào)：1385544