發(fā)布時(shí)間：2018-06-15 05:52

  本文選題：電極脫層 + 屈曲　； 參考：《蘇州大學(xué)》2015年碩士論文

【摘要】：隨著智能材料的快速發(fā)展,由智能材料做成的層合結(jié)構(gòu)功能器件在科研、生活領(lǐng)域得到了很好的應(yīng)用。然而,層狀結(jié)構(gòu)的功能器件在外力作用下往往會(huì)在層間界面處產(chǎn)生脫層并發(fā)生屈曲,影響功能器件的工作效率,故對(duì)存在界面脫層的層狀結(jié)構(gòu)受壓時(shí)的力學(xué)行為進(jìn)行研究對(duì)功能器件的結(jié)構(gòu)設(shè)計(jì)有指導(dǎo)意義。本文建立了金屬電極和半無(wú)限厚度壓電體層合結(jié)構(gòu)的分析模型,用解析方法和有限元數(shù)值模擬方法分別從理論和實(shí)踐上對(duì)金屬電極和半無(wú)限壓電體層合結(jié)構(gòu)層間界面處存在的圓形脫層的屈曲問(wèn)題進(jìn)行了研究,主要研究了脫層徑厚比和壓電基體的壓電效應(yīng)對(duì)金屬電極脫層臨界屈曲應(yīng)變的影響。同時(shí),在有限元數(shù)值模擬方法中還研究了結(jié)構(gòu)半徑和基體厚度對(duì)脫層屈曲載荷的影響。研究結(jié)果表明:壓電基體的壓電效應(yīng)對(duì)金屬電極脫層屈曲的影響較小;脫層徑厚比較小時(shí),臨界屈曲應(yīng)變較大,隨著脫層徑厚比的增大,臨界屈曲應(yīng)變迅速降低,之后變化較平緩并逐漸趨于穩(wěn)定。
[Abstract]:With the rapid development of smart materials, laminated functional devices made of smart materials have been applied in scientific research and life field. However, the delamination and buckling of layered functional devices often occur at the interlaminar interface under external force, which affects the working efficiency of the functional devices. Therefore, the study on the mechanical behavior of layered structures with interfacial delamination is of great significance to the structural design of functional devices. In this paper, an analytical model of metal electrode and semi-infinite thickness piezoelectric laminated structure is established. The buckling problem of circular delamination at the interlaminar interface of a metal electrode and a semi-infinite piezoelectric laminated structure is studied theoretically and practically by using the analytical method and the finite element numerical simulation method, respectively. The influence of the ratio of diameter to thickness of delamination and the piezoelectric effect of piezoelectric matrix on the critical buckling strain of metal electrode delamination was studied. At the same time, the influence of the radius of the structure and the thickness of the matrix on the buckling load of the delamination is also studied in the finite element numerical simulation method. The results show that the piezoelectric effect of piezoelectric matrix has little effect on the delamination buckling of the metal electrode, the critical buckling strain is larger when the delamination thickness is small, and the critical buckling strain decreases rapidly with the increase of the ratio of delamination diameter to thickness. After that, the changes are more gentle and tend to be stable gradually.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB381

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本文編號(hào)：2020943