本文選題：復(fù)合材料　切入點：X型點陣夾芯結(jié)構(gòu)　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：復(fù)合材料點陣夾芯結(jié)構(gòu)具有高比強(qiáng)/比剛度、阻尼減震等優(yōu)點而廣泛的用于各個領(lǐng)域,且其芯子中具有連續(xù)空間,為功能設(shè)計提供可能。本文提出了一種新型拓?fù)浣Y(jié)構(gòu)并研究了其力學(xué)性能。首先,采用水切割嵌鎖組裝制備復(fù)合材料X型點陣夾芯結(jié)構(gòu)。接著,采用理論分析、數(shù)值模擬和試驗測試的方法研究復(fù)合材料X型結(jié)構(gòu)在平壓載荷作用下的力學(xué)性能。簡化X型結(jié)構(gòu)模型,通過理論推出X型結(jié)構(gòu)在平壓載荷作用下的等效剛度及各種失效模式時的強(qiáng)度。采用試驗的方法來研究不同相對密度的X型結(jié)構(gòu)在平壓載荷作用下的破壞機(jī)理及強(qiáng)度。根據(jù)X型結(jié)構(gòu)的破壞機(jī)理提出增強(qiáng)方案并用試驗的手段來研究這種增強(qiáng)型X型結(jié)構(gòu)的力學(xué)性能。研究發(fā)現(xiàn),復(fù)合材料X型結(jié)構(gòu)在相對密度較低時,它的抗屈曲能力要優(yōu)于金子塔點陣夾芯結(jié)構(gòu)。然后,研究復(fù)合材料X型點陣在剪切載荷作用下的力學(xué)性能。簡化復(fù)合材料X型結(jié)構(gòu)在剪切載荷作用下的力學(xué)模型,推出X型結(jié)構(gòu)的等效剛度和強(qiáng)度與加載方向的關(guān)系。采用試驗的方法來研究不同相對密度的X型結(jié)構(gòu)在剪切載荷作用下的破壞機(jī)理及強(qiáng)度。根據(jù)X型結(jié)構(gòu)的破壞機(jī)理提出增強(qiáng)方案并用試驗的手段來研究這種增強(qiáng)型X型結(jié)構(gòu)的力學(xué)性能。研究發(fā)現(xiàn),X型結(jié)構(gòu)的等效剛度與加載方向無關(guān),而剪切強(qiáng)度與加載方向有關(guān)。當(dāng)載荷加載方向為0o時結(jié)構(gòu)的剪切強(qiáng)度最小,當(dāng)載荷加載方向為45o時剪切強(qiáng)度最大。最后,研究復(fù)合材料X型結(jié)構(gòu)在側(cè)壓載荷作用下的力學(xué)性能。簡化復(fù)合材料X型結(jié)構(gòu)在側(cè)壓載荷作用下的力學(xué)模型,推導(dǎo)出其在側(cè)壓載荷作用下各種失效模式對應(yīng)的強(qiáng)度。運用試驗分析的方法對三種不同面板厚度的試件進(jìn)行試驗,試驗中發(fā)現(xiàn)了面板皺曲的失效模式。研究發(fā)現(xiàn),對于薄面板來說,X型結(jié)構(gòu)抗節(jié)點間局部屈曲能力強(qiáng)于金字塔點陣夾芯結(jié)構(gòu)。
[Abstract]:Composite lattice sandwich structures are widely used in various fields because of their advantages of high specific strength / specific stiffness, damping and damping, and their cores have continuous space. In this paper, a new topological structure is proposed and its mechanical properties are studied. Firstly, the composite X type lattice sandwich structure is fabricated by water cutting and interlocking assembly. Numerical simulation and test methods are used to study the mechanical properties of composite X-type structure under flat compression load. The equivalent stiffness and the strength of various failure modes of X-type structures under flat compression loading are deduced theoretically. The failure mechanism of X-type structures with different relative densities under flat compression loads is studied by means of experimental methods. Strength. According to the failure mechanism of X-type structure, the strengthening scheme is put forward and the mechanical properties of the enhanced X-type structure are studied by means of experiments. When the relative density of composite X type structure is low, its buckling ability is better than that of gold tower lattice sandwich structure. The mechanical properties of X type lattice matrix of composite materials under shear load are studied, and the mechanical model of X type composite structure under shear load is simplified. The relationship between the equivalent stiffness and strength of X-type structures and the direction of loading is deduced. The failure mechanism and strength of X-type structures with different relative densities under shear load are studied by means of tests. The mechanical properties of the enhanced X type structure are studied by means of experiments. It is found that the equivalent stiffness of the X type structure is independent of the loading direction. However, the shear strength is related to the loading direction. The shear strength of the structure is the lowest when the loading direction is 0 o, and the maximum when the loading direction is 45 o. Finally, The mechanical properties of composite X structure under lateral compression were studied, and the mechanical model of composite X structure under lateral compression was simplified. The corresponding strength of various failure modes under lateral pressure load is deduced. Three kinds of specimens with different face plate thickness are tested by the method of experimental analysis, and the failure modes of panel wrinkle are found in the test. For thin panel, the local buckling resistance of X type structure is better than that of pyramid lattice sandwich structure.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB332

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 ;Mechanics of advanced fiber reinforced lattice composites[J];Acta Mechanica Sinica;2010年06期

2 春勝利;黃榴紅;李勇鋒;;碳纖維及其在復(fù)合材料方面的應(yīng)用[J];玻璃鋼;2005年02期

相關(guān)博士學(xué)位論文 前1條

1 張國旗;復(fù)合材料點陣結(jié)構(gòu)吸能特性和抗低速沖擊性能研究[D];哈爾濱工業(yè)大學(xué);2014年

，

本文編號：1571159