本文選題：波紋纖維 + 形狀記憶�。� 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：形狀記憶聚合物是一種特殊的高分子聚合物。該種材料具有剛度隨溫度而改變的特點(diǎn)(低溫時(shí)高剛度,高溫時(shí)低剛度)。鯊魚皮肋條結(jié)構(gòu)是鯊魚皮表面的一種溝槽結(jié)構(gòu),該結(jié)構(gòu)能夠減少物體在流體中流動(dòng)時(shí)產(chǎn)生的阻力,其機(jī)理在于流體在溝槽中流動(dòng)時(shí)會(huì)形成二次渦,二次渦能夠削弱湍流的產(chǎn)生從而達(dá)到減少阻力的目的。本文制備了一種波紋形彈性纖維增強(qiáng)的形狀記憶聚合物復(fù)合材料,該復(fù)合材料具有通過加熱改變自身剛度的特性,由于材料變剛度的特點(diǎn)以及纖維波紋形狀的幾何特性,使得該材料在高溫單軸拉伸的情況下,基體表面上可產(chǎn)生溝槽結(jié)構(gòu),降低溫度時(shí),復(fù)合材料剛度變大,溝槽結(jié)構(gòu)鎖定變形,故可將此種材料作為制備仿鯊魚皮肋條結(jié)構(gòu)的材料。本文的主要研究?jī)?nèi)容包括波紋形纖維增強(qiáng)復(fù)合材料制備方法的研究以及力學(xué)性能研究。建立了預(yù)測(cè)波紋纖維面外位移的一種理論,建立了大變形情況下,復(fù)合材料的應(yīng)力-應(yīng)變關(guān)系,計(jì)算了大變形情況下的柔度矩陣。為了更好的研究形狀記憶聚合物復(fù)合材料的基本力學(xué)性能,本文進(jìn)行了一系列的力學(xué)性能表征,包括形狀記憶聚合物基體的熱-機(jī)械性能測(cè)試(DMA)、復(fù)合材料的常溫及高溫下拉伸實(shí)驗(yàn),分析了材料在拉伸狀態(tài)下的力學(xué)性能,利用三維光學(xué)散斑系統(tǒng)測(cè)量復(fù)合材料的應(yīng)變和位移,觀察到材料在高溫拉伸下表面溝槽結(jié)構(gòu)的形成,得到了溝槽結(jié)構(gòu)隨時(shí)間的變化圖。最后,本文仿真了材料在單軸拉伸載荷下的變形情況。得出了材料的變形圖,位移云圖,仿真結(jié)果顯示在材料的表面確實(shí)形成了溝槽結(jié)構(gòu)。根據(jù)仿真的結(jié)果,輸出了纖維的面外位移,并與本文得到的預(yù)測(cè)纖維面外變形的理論做對(duì)比,發(fā)現(xiàn)理論值與仿真值誤差最大為13.253%。
[Abstract]:Shape memory polymer is a special kind of polymer. The material has the characteristics of the stiffness varying with the temperature (high stiffness at low temperature, low stiffness at high temperature). The shark skin rib structure is a groove structure on the surface of the shark skin, which can reduce the resistance of the body in the fluid flow. The mechanism lies in the fluid in the structure. Two vortices are formed in the flow of the grooves. The two vortices can weaken the formation of the turbulence and thus reduce the resistance. A corrugated elastic fiber reinforced shape memory polymer composite has been prepared. The composite has the characteristics of changing its stiffness by heating and the characteristics of material stiffness and fiber wave. The geometric characteristics of the grain shape make the material produce grooves on the surface of the matrix under the condition of high temperature uniaxial tension. When the temperature is reduced, the stiffness of the composite material becomes larger and the groove structure is locked. Therefore, this material can be used as a material to prepare the shark skin rib structure. The main contents of this paper include corrugated fiber reinforcement. Research on the preparation of composite materials and the study of mechanical properties. A theory for predicting the displacement of corrugated fibers is established. The stress strain relationship of composite materials under large deformation is established and the flexibility matrix of large deformation is calculated. In order to better study the basic mechanical properties of the shape memristor polymer composites, the basic mechanical properties of the composite materials are studied better. A series of mechanical properties were characterized, including the thermal mechanical properties test (DMA) of the shape memory polymer matrix, the tensile test at normal temperature and high temperature of the composite. The mechanical properties of the material under tensile state were analyzed. The strain and displacement of the composite were measured by the three-dimensional optical speckle system, and the tensile strength was observed at high temperature. In the end, the deformation of the material under uniaxial tension is simulated. The deformation diagram of the material and the displacement cloud are obtained. The simulation results show that the groove structure does form on the surface of the material. The out of plane displacement of the fiber is output according to the simulation results. Compared with the theory of prediction of fiber out of plane deformation, the maximum error of theoretical value and simulation value is 13.253%.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332;TQ317

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前2條

1 譚巧;形狀記憶環(huán)氧聚合物及其復(fù)合材料的典型力學(xué)行為研究[D];哈爾濱工業(yè)大學(xué);2015年

2 蘭鑫;形狀記憶聚合物復(fù)合材料及其力學(xué)基礎(chǔ)研究[D];哈爾濱工業(yè)大學(xué);2010年

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本文編號(hào)：1946626