【摘要】：復(fù)合材料是由兩種或兩種以上有著不同物理和化學(xué)性質(zhì)的材料按一定的比例復(fù)合而成的。一般來(lái)講,熱塑性聚合物基復(fù)合材料(以下簡(jiǎn)稱熱塑性聚合材料)由兩種材料復(fù)合而成,例如,纖維作為增強(qiáng)體,樹(shù)脂等聚合材料作為基體。因?yàn)闊崴苄跃酆喜牧暇哂懈邚?qiáng)度、低密度、良好的耐腐蝕性以及良好的環(huán)保性能等其它優(yōu)良的力學(xué)和物理性能,它們?cè)诤娇蘸教臁⑸锕こ�、能源工程以及生活等領(lǐng)域得到了廣泛應(yīng)用。對(duì)于熱塑性聚合材料,新型增強(qiáng)體和基體的研究一直以來(lái)是研究人員得到新型材料的途徑。然而,研究人員一般容易忽視的問(wèn)題是對(duì)熱塑性聚合材料中孔隙率的研究。本文以含孔隙的熱塑性聚合圓筒結(jié)構(gòu)為研究對(duì)象,假設(shè)熱塑性聚合材料是各向同性的,各物性參數(shù)隨孔隙率的變化而變化,基于經(jīng)典的彈性力學(xué)理論,得到了在熱機(jī)和濕熱耦合場(chǎng)下,熱塑性聚合圓筒的動(dòng)態(tài)響應(yīng)控制方程。其次,本文利用Hankel變換和Laplace變換原理求得了熱機(jī)耦合下彈性范圍內(nèi)動(dòng)態(tài)問(wèn)題的解析解,利用有限差分法和Newmark法求得了熱機(jī)耦合下粘彈性范圍內(nèi)和濕熱耦合下彈性范圍內(nèi)動(dòng)態(tài)問(wèn)題的數(shù)值解。通過(guò)以上方法,本文第二章具體分析了在熱機(jī)耦合下含孔隙的無(wú)限長(zhǎng)熱塑性聚合圓筒的動(dòng)態(tài)響應(yīng),得到了孔隙率對(duì)位移和應(yīng)力振動(dòng)頻率的影響規(guī)律;第三章具體分析了在熱機(jī)耦合下含孔隙的無(wú)限長(zhǎng)熱塑性聚合圓筒的粘彈性動(dòng)力學(xué)行為,得到了孔隙率對(duì)熱塑性聚合材料粘彈性的影響規(guī)律;第四章和第五章具體分析了在濕熱耦合下含孔隙的無(wú)限長(zhǎng)熱塑性聚合圓筒的動(dòng)態(tài)響應(yīng)以及在濕熱耦合下含孔隙的有限長(zhǎng)雙層圓筒的動(dòng)力學(xué)行為,得到了孔隙率對(duì)熱塑性聚合材料濕熱傳導(dǎo)的影響規(guī)律。除了孔隙率以外,本文還分別討論了機(jī)械荷載、溫度和濕度荷載以及厚度比等因素對(duì)熱塑性聚合圓筒力學(xué)性能的影響。本文的研究工作將豐富和發(fā)展復(fù)合材料、結(jié)構(gòu)動(dòng)力學(xué)和熱彈性力學(xué)。同時(shí)本文所得到的結(jié)論為熱塑性聚合材料的制造和進(jìn)一步研究提供一定的理論依據(jù),并具有一定的工程實(shí)際應(yīng)用價(jià)值。
[Abstract]:Composite materials are composed of two or more materials with different physical and chemical properties. Generally speaking, thermoplastic polymer matrix composites (hereinafter referred to as thermoplastic polymeric materials) are composed of two kinds of materials, for example, fibers as reinforcements, resins and other polymeric materials as matrix. Because thermoplastic polymeric materials have high strength, low density, good corrosion resistance, good environmental protection and other excellent mechanical and physical properties, they are in aerospace, bioengineering, Energy engineering and life and other fields have been widely used. For thermoplastic polymeric materials, the study of new reinforcements and substrates has always been the way for researchers to obtain new materials. However, the problem that researchers tend to ignore is the study of porosity in thermoplastic polymeric materials. In this paper, the thermoplastic polymerized cylinder structure with pores is taken as the object of study. It is assumed that the thermoplastic polymeric material is isotropic, and the physical parameters vary with the porosity, based on the classical theory of elasticity. The governing equation of dynamic response of thermoplastic polymerized cylinder is obtained under the coupling field of heat engine and wet heat. Secondly, the analytical solution of the dynamic problem in the elastic range under thermo-mechanical coupling is obtained by using the Hankel transform and the Laplace transformation principle. By using the finite difference method and the Newmark method, the numerical solutions of the dynamic problems in the viscoelastic range and the hygrothermal coupling range are obtained. In the second chapter, the dynamic response of infinite thermoplastic polymerized cylinder with pores under thermo-mechanical coupling is analyzed, and the effect of porosity on displacement and stress vibration frequency is obtained. In chapter 3, the viscoelastic dynamic behavior of infinite thermoplastic polymerized cylinder with pores under thermo-mechanical coupling is analyzed, and the influence of porosity on viscoelasticity of thermoplastic polymeric materials is obtained. In the fourth and fifth chapters, the dynamic response of infinite thermoplastic polymerized cylinder with pores and the dynamic behavior of finite length double-layer cylinder with pores under the hygrothermal coupling are analyzed in detail. The effect of porosity on wet heat conduction of thermoplastic polymeric materials was obtained. In addition to porosity, the effects of mechanical load, temperature and humidity load and thickness ratio on the mechanical properties of thermoplastic polymerized cylinder are discussed. The research work in this paper will enrich and develop composite materials, structural dynamics and thermoelastic mechanics. At the same time, the conclusions obtained in this paper provide a certain theoretical basis for the manufacture and further study of thermoplastic polymeric materials, and have a certain practical application value in engineering.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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本文編號(hào)：2139329