本文選題：磁流變彈性體 + 磁偶極子��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：磁流變彈性體是由鐵磁性顆粒和橡膠類(lèi)基體組成的智能材料,目前,研究磁流變彈性體的力學(xué)模型主要是磁偶極子模型以及修正的磁偶極子模型,這些模型考慮了顆粒之間的相互作用,尚未涉及顆粒和基體之間的相互作用。本文考慮到顆粒和基體之間的相互作用,計(jì)算出不同強(qiáng)度界面磁流變彈性體的力學(xué)性能,當(dāng)應(yīng)變幅值較小時(shí),顆粒之間的界面相切應(yīng)力比較小,顆粒完好無(wú)損,結(jié)合方式主要是強(qiáng)結(jié)合界面;當(dāng)應(yīng)變幅值繼續(xù)增加,能夠克服基體的屈服應(yīng)力后,磁流變彈性體內(nèi)部發(fā)生滑移,界面相的結(jié)合強(qiáng)度開(kāi)始減弱,形成弱結(jié)合界面。論文主要工作內(nèi)容包括以下四個(gè)方面:(1)介紹磁流變彈性體及其應(yīng)用,由于磁流變彈性體剪切模量具有磁場(chǎng)可控性,被廣泛應(yīng)用到汽車(chē)減振機(jī)構(gòu)、動(dòng)態(tài)吸振器、緩沖隔振機(jī)構(gòu)中;對(duì)國(guó)內(nèi)外理論研究現(xiàn)狀進(jìn)行了分析綜合,將現(xiàn)有的理論模型分為三大類(lèi):唯象模型、磁偶極子模型、連續(xù)介質(zhì)模型,比較了三者的優(yōu)缺點(diǎn)。(2)針對(duì)界面相效應(yīng),著重分析了不同應(yīng)變幅值對(duì)界面結(jié)合強(qiáng)度的影響,將界面主要分為強(qiáng)結(jié)合界面和弱結(jié)合界面。對(duì)Eshelby等效夾雜理論和Mori-Tanaka兩種典型的方法進(jìn)行詳細(xì)分析,指出前者適用于研究單個(gè)夾雜引起復(fù)合材料性能的變化,沒(méi)有考慮到夾雜間的相互影響,后者考慮到這個(gè)問(wèn)題,但是沒(méi)有考慮界面弱化后對(duì)材料力學(xué)性能的影響。(3)針對(duì)不同界面結(jié)合強(qiáng)度對(duì)磁流變彈性體力學(xué)性能的影響,提出一種界面相模型,并計(jì)算出強(qiáng)結(jié)合界面的模量和阻尼特性,考慮到界面弱化的影響,進(jìn)行了修正,計(jì)算出弱結(jié)合界面磁流變彈性體的模量特性和弱化后的界面阻尼;根據(jù)混合率準(zhǔn)則,推導(dǎo)出無(wú)場(chǎng)下具有不同界面結(jié)合強(qiáng)度磁流變彈性體的模量和阻尼特性。關(guān)于磁流變彈性體的磁致效應(yīng),利用磁偶極子模型和修正的磁偶極子模型進(jìn)行補(bǔ)充。(4)分別在有場(chǎng)和無(wú)場(chǎng)下制備四組不同顆粒含量硅橡膠基的磁流變彈性體,并對(duì)其微觀結(jié)構(gòu)進(jìn)行觀察,有場(chǎng)下顆粒之間形成有序的鏈狀結(jié)構(gòu),無(wú)場(chǎng)下對(duì)于顆粒含量較高的磁流變彈性體內(nèi)部則呈現(xiàn)規(guī)則化密布排列。通過(guò)動(dòng)態(tài)機(jī)械分析儀測(cè)試磁流變彈性體的力學(xué)性能,同時(shí)結(jié)合推導(dǎo)出的力學(xué)公式,分析模量、阻尼和不同磁場(chǎng)強(qiáng)度、顆粒含量、應(yīng)變幅值的關(guān)系,將實(shí)驗(yàn)結(jié)果和理論結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證了所提模型的有效性。
[Abstract]:Magnetorheological elastomer is a smart material composed of ferromagnetic particles and rubber matrix. At present, the mechanical model of magneto-rheological elastomer is mainly magnetic dipole model and modified magnetic dipole model. These models take into account the interaction between particles but not between particles and matrix. In this paper, considering the interaction between particles and matrix, the mechanical properties of magneto-rheological elastomer with different strength are calculated. When the strain amplitude is small, the interfacial shear stress between particles is small and the particles are intact. When the strain amplitude continues to increase, the matrix yield stress can be overcome, the internal slip occurs, the bonding strength of the interface phase begins to weaken, and the weak bonding interface is formed. The main work of this paper includes the following four aspects: 1) introduce Mr elastomer and its application. Because the shear modulus of MRE has magnetic field controllability, it has been widely used in automobile vibration absorber, dynamic vibration absorber and buffer isolation mechanism. The current theoretical models are divided into three categories: phenomenological model, magnetic dipole model and continuum model. The advantages and disadvantages of the three models are compared. The influence of different strain amplitudes on the bonding strength of the interface is analyzed. The interface is mainly divided into strong bound interface and weak bonding interface. The Eshelby equivalent inclusion theory and two typical methods of Mori-Tanaka are analyzed in detail. It is pointed out that the former is suitable for studying the change of composite properties caused by a single inclusion without considering the interaction between inclusions, and the latter for this problem. However, the effect of interface weakening on the mechanical properties of materials is not considered. (3) aiming at the effect of different interface bonding strength on the mechanical properties of magneto-rheological elastomer, an interface phase model is proposed, and the modulus and damping characteristics of strongly bonded interface are calculated. Considering the influence of interface weakening, the modulus properties of weakly bonded interface magneto-rheological elastomer and the interface damping after weakening are calculated, according to the mixing rate criterion, The modulus and damping properties of magneto-rheological elastomers with different interfacial bonding strength without field are derived. On the magnetoelectric effect of magneto-rheological elastomer, four groups of magneto-rheological elastomers with different particle contents were prepared by using magnetic dipole model and modified magnetic dipole model. The microstructure was observed. There were orderly chain structures between particles in the field and regular and dense arrangement in the magneto-rheological elastomer with high particle content in the absence of the field. The mechanical properties of magnetorheological elastomer were measured by dynamic mechanical analyzer. At the same time, the relationship between modulus, damping and different magnetic field intensity, particle content and strain amplitude was analyzed. The experimental results are compared with the theoretical results to verify the validity of the proposed model.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TB381

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