【摘要】：竹塑復(fù)合材料作為一種性能優(yōu)異的新型環(huán)保材料,在建筑、包裝、汽車(chē)工業(yè)等領(lǐng)域得到廣泛應(yīng)用。本論文以竹塑復(fù)合材料的配方、截面結(jié)構(gòu)設(shè)計(jì)與優(yōu)化以及芯-殼結(jié)構(gòu)竹塑復(fù)合材料設(shè)計(jì)為主要研究對(duì)象,以探索竹塑復(fù)合材料制品的截面結(jié)構(gòu)設(shè)計(jì)優(yōu)化方法及其與使用性能的關(guān)系為目標(biāo),構(gòu)建了竹塑復(fù)合材料制品承載力學(xué)分析模型,并通過(guò)理論計(jì)算、有限元模擬和實(shí)驗(yàn)驗(yàn)證相結(jié)合的方法,系統(tǒng)地研究了截面芯孔的形狀、數(shù)量、尺寸、殼層結(jié)構(gòu)等因素對(duì)竹塑復(fù)合材料整體承載能力和抗變形能力的影響,形成了具有芯-殼結(jié)構(gòu)的竹塑復(fù)合材料的結(jié)構(gòu)設(shè)計(jì)與性能控制的新方法,并能定量指導(dǎo)相關(guān)制品的結(jié)構(gòu)設(shè)計(jì)。主要研究工作如下：1.分析了竹粉的粒徑、含量及界面改性劑對(duì)竹粉/HDPE復(fù)合材料力學(xué)性能和微觀結(jié)構(gòu)的影響,確定了綜合性能較優(yōu)異的竹粉/HDPE復(fù)合材料配方,量化了竹粉/HDPE復(fù)合材料的基本力學(xué)設(shè)計(jì)參數(shù)。2.運(yùn)用材料力學(xué)的相關(guān)理論分析,構(gòu)建了竹塑復(fù)合材料截面形狀結(jié)構(gòu)的承載力學(xué)理論計(jì)算模型,并通過(guò)有限元模擬和理論計(jì)算相結(jié)合的方法,詳細(xì)研究了截面芯孔的形狀、數(shù)量和尺寸對(duì)材料整體承載能力和抗變形能力的影響關(guān)系,并通過(guò)實(shí)驗(yàn)研究,驗(yàn)證了地板截面結(jié)構(gòu)的優(yōu)化設(shè)計(jì)方法,得到了綜合性能較優(yōu)的竹塑復(fù)合材料芯層截面結(jié)構(gòu)形狀。3.在綜合性能較優(yōu)的竹塑復(fù)合材料配方和截面形狀結(jié)構(gòu)的前提下,通過(guò)殼層材料的設(shè)計(jì),有限元模擬分析研究了芯-殼結(jié)構(gòu)對(duì)竹塑復(fù)合材料整體承載能力和彎曲強(qiáng)度的影響,并分別選取HDPE、纖維增強(qiáng)HDPE和納米增強(qiáng)HDPE三種不同的殼層材料,成功制備了具有芯-殼結(jié)構(gòu)的竹塑復(fù)合材料制品試樣,分析了殼層材料對(duì)芯-殼竹塑復(fù)合材料彎曲強(qiáng)度和承載能力的影響,驗(yàn)證并確定了最佳的殼層材料配方和結(jié)構(gòu)。以上研究成果豐富和完善了竹塑復(fù)合材料結(jié)構(gòu)設(shè)計(jì)的理論和內(nèi)容,加深了對(duì)竹塑復(fù)合材料制品的截面結(jié)構(gòu)設(shè)計(jì)與使用性能關(guān)系的認(rèn)識(shí)。不僅可以為竹塑復(fù)合材料結(jié)構(gòu)設(shè)計(jì)的優(yōu)化提供詳實(shí)的實(shí)驗(yàn)數(shù)據(jù)及理論依據(jù),還可以對(duì)結(jié)構(gòu)型芯-殼竹塑復(fù)合材料的工業(yè)化生產(chǎn)提供技術(shù)指導(dǎo),具有較大的理論與現(xiàn)實(shí)意義。
[Abstract]:As a new kind of environmental protection material with excellent performance, bamboo plastic composite has been widely used in construction, packaging, automobile industry and so on. In this paper, the formulation, cross-section structure design and optimization of bamboo plastic composite and the design of core shell structure bamboo plastic composite are the main research objects. In order to explore the optimization method of cross-section structure design of bamboo and plastic composite products and its relationship with the performance, a model for the analysis of bearing capacity of bamboo and plastic composite products was established, and the theoretical calculation was carried out. By combining finite element simulation with experimental verification, the effects of the shape, quantity, size and shell structure of the cross-section core holes on the overall bearing capacity and deformation resistance of the bamboo-plastic composite are systematically studied. A new method of structure design and property control of bamboo plastic composite with core-shell structure is formed, and it can guide the structure design of related products quantitatively. The main research work is as follows: 1. The effects of the particle size, content and interfacial modifier of bamboo powder on the mechanical properties and microstructure of bamboo powder / HDPE composite were analyzed, and the formula of bamboo powder / HDPE composite with excellent comprehensive properties was determined. The basic mechanical design parameters of bamboo powder / HDPE composite were quantified. Based on the theoretical analysis of material mechanics, the theoretical calculation model of bearing capacity of section shape structure of bamboo plastic composite is established, and the shape of section core hole is studied in detail by combining finite element simulation and theoretical calculation. The effect of quantity and size on the overall bearing capacity and deformation resistance of the material was studied. The optimum design method of floor cross-section structure was verified by experimental research. The shape of core layer cross-section structure of bamboo plastic composite with better comprehensive performance was obtained. On the premise of the formulation and section shape structure of bamboo plastic composite with better comprehensive properties, the influence of core-shell structure on the overall bearing capacity and bending strength of bamboo plastic composite was studied by the design of shell material and finite element simulation. Three different shell materials, HDPE, fiber reinforced HDPE and nano-reinforced HDPE, were used to prepare bamboo / plastic composites with core-shell structure. The influence of shell material on the bending strength and bearing capacity of core-shell bamboo plastic composite was analyzed. The optimum formula and structure of shell material were verified and determined. The above research results enrich and perfect the theory and content of the structural design of bamboo plastic composite materials, and deepen the understanding of the relationship between the cross-section structure design of bamboo and plastic composite products and their performance. It can not only provide detailed experimental data and theoretical basis for structural design optimization of bamboo-plastic composites, but also provide technical guidance for industrial production of structural core-shell bamboo-plastic composites, which is of great theoretical and practical significance.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB332

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