本文選題：復合材料　切入點：蜂窩結(jié)構　出處：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：復合材料蜂窩結(jié)構是一種具有高比強度、高比剛度的新型輕質(zhì)復合材料夾芯結(jié)構,廣泛應用于各種領域。但是由于復合材料蜂窩結(jié)構在低密度區(qū)域容易發(fā)生彈性屈曲失效,導致結(jié)構的平壓性能較低,結(jié)構的承載能力不夠好;同時由于面板和芯子之間存在粘接強度不足的問題,導致復合材料蜂窩結(jié)構的剪切性能、彎曲性能等較低。本文針對以上問題,采用多級結(jié)構設計思想,將高性能PMI泡沫加入到單向增強碳纖維復合材料之間,對多級復合材料蜂窩結(jié)構進行了制備,并研究了結(jié)構的力學性能。主要研究內(nèi)容如下:第一章介紹了復合材料夾芯結(jié)構的研究背景、國內(nèi)外研究現(xiàn)狀以及本文的主要研究內(nèi)容。第二章介紹了多級復合材料蜂窩結(jié)構的制備工藝流程。其中主要采用嵌鎖組裝工藝制備多級復合材料蜂窩結(jié)構的芯子。第三章研究了多級復合材料蜂窩結(jié)構的平壓性能,主要包括多級復合材料蜂窩結(jié)構平壓性能的理論預報與試驗驗證。通過理論研究與試驗驗證發(fā)現(xiàn)合適的PMI泡沫能夠使結(jié)構的平壓性能達到最佳,根據(jù)這一點,得到了平壓性能達到最佳的多級復合材料蜂窩結(jié)構設計方案。第四章在第三章對多級復合材料蜂窩結(jié)構平壓性能進行研究的基礎上,研究了經(jīng)歷了循環(huán)加載之后的多級復合材料蜂窩結(jié)構的平壓性能的變化情況,為工程上的應用提供了一定的參考。第五章對多級復合材料蜂窩結(jié)構的三點彎曲性能進行了研究,主要包括理論預報與試驗驗證。通過理論研究對多級復合材料蜂窩結(jié)構的失效模式進行了預報,繪制了失效模式機制圖,并通過三點彎曲試驗對理論預報結(jié)果進行了驗證。
[Abstract]:Composite honeycomb structure is a new type of lightweight composite sandwich structure with high specific strength and high specific stiffness, which is widely used in various fields. However, composite honeycomb structure is prone to elastic buckling failure in low density region. As a result, the flat compression property of the structure is low, the bearing capacity of the structure is not good enough, and the shear behavior of the composite honeycomb structure is caused by the problem of insufficient bonding strength between the panel and the core. In view of the above problems, the high performance PMI foam was added to the unidirectional reinforced carbon fiber composites, and the honeycomb structure of the multistage composites was prepared. The main contents are as follows: chapter 1 introduces the research background of composite sandwich structure. In the second chapter, the fabrication process of multistage composite honeycomb structure is introduced, in which the core of multistage composite honeycomb structure is prepared by interlocking assembly process. In chapter 3, the flat compression properties of multistage composite honeycomb structures are studied. This paper mainly includes the theoretical prediction and experimental verification of the flat compressive properties of multistage composite honeycomb structures. Through theoretical research and experimental verification, it is found that the proper PMI foam can make the structure achieve the best pressure performance, according to this point, The design scheme of multistage composite honeycomb structure with optimum flat compression performance is obtained. In chapter 4, on the basis of the research on the flat compression performance of multistage composite honeycomb structure in chapter 3, In this paper, the variation of the compressive properties of multistage composite honeycomb structures after cyclic loading is studied, which provides a certain reference for engineering applications. In chapter 5, the three-point bending properties of multistage composite honeycomb structures are studied. The failure mode of multistage composite honeycomb structure is predicted by theoretical research, and the failure mode mechanism diagram is drawn, and the theoretical prediction results are verified by three-point bending test.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB33

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