本文關(guān)鍵詞：2.5維織物及其復(fù)合件的基本力學(xué)性能分析　出處：《哈爾濱工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 2.5維織物 幾何模型 變形行為 彈性模量 強(qiáng)度

【摘要】：2.5維織物是一種特殊的三維織物,在厚度方向上具有更好的力學(xué)性能,在航空、航天相關(guān)領(lǐng)域都受到學(xué)者們的廣泛關(guān)注,具有良好的應(yīng)用價(jià)值前景。本文對(duì)徑向增強(qiáng)的2.5維織物和2.5維機(jī)織復(fù)合材料進(jìn)行分析。通過(guò)理論分析、實(shí)驗(yàn)測(cè)試對(duì)結(jié)構(gòu)的基本力學(xué)性能進(jìn)行分析。第一章介紹本文的研究背景以及研究意義,對(duì)國(guó)內(nèi)外關(guān)于織物的力學(xué)性能方面研究、細(xì)觀模型研究以及成型工藝方面研究進(jìn)行了概述。第二章對(duì)2.5維織物細(xì)觀結(jié)構(gòu)進(jìn)行分析。利用顯微鏡觀察紗線的截面形狀和接結(jié)經(jīng)紗走向,確定相應(yīng)的幾何模型�；诖_立的幾何模型對(duì)2.5維織物進(jìn)行理論分析,首先,通過(guò)能量等效的方法計(jì)算織物的宏觀彈性模量;然后根據(jù)紗線的變形情況分析織物的厚度和寬度變化;最后通過(guò)改變?nèi)∠蚪桥c層數(shù),得出2.5維織物的彈性模量與取向角、層數(shù)的關(guān)系。第三章對(duì)2.5維織物變形行為進(jìn)行分析。通過(guò)拉伸實(shí)驗(yàn)測(cè)試分析拉伸變形率和拉伸殘余變形率,得出織物在拉伸載荷作用下的拉伸變形情況。其次,對(duì)織物的厚度變形率進(jìn)行分析,得出徑向拉伸過(guò)程中織物的厚度變化情況。第四章應(yīng)用浸漬復(fù)合法和RTM復(fù)合法制備2.5維機(jī)織復(fù)合材料。首先根據(jù)工藝要求設(shè)計(jì)一套復(fù)合模具;然后根據(jù)工藝條件確定復(fù)合工藝流程;最后對(duì)復(fù)合后試件進(jìn)行了C掃描檢測(cè),檢驗(yàn)制備的試件是否含有缺陷,并且通過(guò)掃描結(jié)果對(duì)兩種復(fù)合工藝進(jìn)行比較,指出各自的優(yōu)缺點(diǎn)。第五章分析2.5維機(jī)織復(fù)合材料力學(xué)性能。首先通過(guò)理論計(jì)算得出2.5維機(jī)織復(fù)合材料的纖維體積含量;然后對(duì)復(fù)合后結(jié)構(gòu)進(jìn)行了拉伸、壓縮以及三點(diǎn)彎曲實(shí)驗(yàn)測(cè)試,對(duì)失效模式、測(cè)試結(jié)果進(jìn)行分析得出:兩種復(fù)合制備方法的力學(xué)性能是否有區(qū)別以及預(yù)變形對(duì)結(jié)構(gòu)的力學(xué)性能影響規(guī)律。
[Abstract]:2.5 dimensional fabric is a special 3D fabric. It has better mechanical properties in thickness direction. It has been widely concerned in aviation and aerospace related fields, and has good application prospects. In this paper, a radial reinforced 2.5 - dimensional fabric and a 2.5 - dimensional woven composite are analyzed. The basic mechanical properties of the structure are analyzed by theoretical analysis and experimental test. The first chapter introduces the background and significance of the research, and summarizes the research on mechanical properties, meso model and molding technology of fabrics at home and abroad. In the second chapter, the microstructure of the 2.5 dimensional fabric is analyzed. The geometric model of the yarn is determined by observing the cross section shape of the yarn and the alignment of the warp yarn with the microscope. The geometric model established by theoretical analysis, the 2.5 dimensional fabric based on the first, through the method of equivalent energy calculation of the macroscopic elastic modulus of fabric; then analyzes the changes of width and thickness of the fabric according to the deformation of yarn; finally, by changing the orientation angle and the number of layers, the elastic modulus and the orientation angle of 2.5 dimensional fabric and the number of. In the third chapter, the deformation behavior of 2.5 dimensional fabric is analyzed. The tensile deformation rate and the tensile residual deformation rate were analyzed by tensile test, and the tensile deformation of the fabric under tensile load was obtained. Secondly, the thickness deformation rate of the fabric is analyzed, and the change of the fabric thickness during the radial tensile process is obtained. In the fourth chapter, 2.5 - dimensional woven composites were prepared by impregnation composite method and RTM composite method. According to the technological requirements to design a set of compound die; and then determine the composite process according to the process conditions; at the end of the composite specimens were detected by C scanning, test whether the preparation of specimens with defects, and two kinds of composite processes were compared by scanning results, pointed out their advantages and disadvantages. In the fifth chapter, the mechanical properties of 2.5 - dimensional woven composites are analyzed. Fiber volume content first through the theoretical calculation of 2.5 dimensional woven composites; then the composite structure of tensile, compression and three point bending test, the failure mode, analyze the test results obtained: two composite preparation method of mechanical properties and whether there is a difference between the pre deformation on the mechanical properties of the structure of the law.
【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】：2016
【分類號(hào)】：V250
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本文編號(hào)：1338496