【摘要】：形狀記憶聚合物能在外界激勵(lì)下由臨時(shí)形態(tài)回到初始形態(tài),是一種具有形狀記憶效應(yīng)的新型功能材料。形狀記憶聚合物的缺點(diǎn)主要在于強(qiáng)度低、剛度小、回復(fù)力弱等,嚴(yán)重影響其實(shí)際應(yīng)用。利用紡織織物增強(qiáng)的方法,可以明顯改進(jìn)這些不足,并有效均勻復(fù)合材料面內(nèi)性能和改善面外性能。目前對于紡織織物增強(qiáng)形狀記憶聚合物復(fù)合材料(紡織SMPCs)熱-力學(xué)行為研究工作較少,本文主要針對此課題做了如下工作:首先,建立了紡織SMPCs的多尺度力學(xué)模型。根據(jù)三維機(jī)織復(fù)合材料細(xì)觀結(jié)構(gòu)提出了一種新的建模方法,以紗線密度及紗線填充因子為主要參數(shù)建立了三維機(jī)織SMPCs參數(shù)化細(xì)觀結(jié)構(gòu)模型。其次,對平面機(jī)織SMPCs的形狀記憶性能進(jìn)行了研究,分析了織物增強(qiáng)層拉伸模量、彎曲模量對其熱力循環(huán)的影響。將平面機(jī)織SMPCs在厚度方向劃分為5層,研究了鋪層位置對其熱-力學(xué)行為的影響。結(jié)果表明,純彎曲狀態(tài)下平面機(jī)織SMPCs形狀記憶性能只與彎曲模量有關(guān),織物處于拉伸側(cè)有利于提高形狀固定率及回復(fù)力。再次,基于多尺度模型,通過基體的粘彈性參數(shù)和纖維的彈性常數(shù),導(dǎo)出紗線的三維熱粘彈性本構(gòu)關(guān)系,給出了正交各向異性粘彈性材料ABAQUS子程序的編寫方法。研究了外載荷及細(xì)觀結(jié)構(gòu)對三維機(jī)織SMPCs細(xì)觀單胞等效熱粘彈性能的影響。最后,以熱粘彈性能的研究為基礎(chǔ),對三維機(jī)織SMPCs的形狀記憶行為進(jìn)行了分析,模擬了自由回復(fù)與約束回復(fù)兩種熱力循環(huán),研究了外載荷及機(jī)織參數(shù)對其記憶性能的影響。
[Abstract]:Shape memory polymer can return from temporary morphology to initial form under external excitation. It is a new functional material with shape memory effect. The main disadvantages of shape memory polymer are low strength, low stiffness, weak recovery force and so on, which seriously affect its practical application. By using the method of textile fabric reinforcement, these shortcomings can be obviously improved, and the in-plane properties and out-of-plane properties of composite materials can be effectively uniform. At present, there is little research on thermal-mechanical behavior of textile fabric reinforced shape memory polymer composites (textile SMPCs). The main work of this paper is as follows: firstly, the multi-scale mechanical model of textile SMPCs is established. According to the meso-structure of three-dimensional woven composites, a new modeling method is proposed. The three-dimensional woven SMPCs parametric meso-structure model is established with yarn density and yarn filling factor as the main parameters. Secondly, the shape memory properties of planar woven SMPCs were studied, and the effects of tensile modulus and bending modulus of fabric reinforced layer on its thermal cycle were analyzed. The plane woven SMPCs is divided into five layers in the thickness direction, and the effect of paving position on its thermal-mechanical behavior is studied. The results show that the shape memory performance of plane woven SMPCs is only related to the bending modulus in pure bending state, and the shape fixation rate and recovery force of the fabric are improved by being on the tensile side. Thirdly, based on the multi-scale model, through the Viscoelastic parameters of the matrix and the elastic constant of the fiber, the three-dimensional thermal Viscoelastic Constitutive relation of the yarn is derived, and the method of compiling the subprogram of the orthotropic Viscoelastic material Abaqus is given. The effects of external load and meso-structure on the equivalent thermal Viscoelastic properties of three-dimensional woven SMPCs meso-unit cells were studied. Finally, based on the study of thermal Viscoelastic properties, the shape memory behavior of 3D woven SMPCs is analyzed, two kinds of thermal cycles, free recovery and constrained recovery, are simulated, and the effects of external load and weaving parameters on their memory performance are studied.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB332

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本文編號：2494245