本文選題：復(fù)合材料維修　切入點(diǎn)：固化　出處：《中國民用航空飛行學(xué)院》2015年碩士論文

【摘要】：深入研究復(fù)合材料維修固化反應(yīng)過程,運(yùn)用超聲技術(shù)實(shí)時在線監(jiān)控固化進(jìn)程,分析不同固化參數(shù)對固化后材料性能的影響,對于開發(fā)更優(yōu)的維修固化工藝,實(shí)現(xiàn)固化過程的可控具有重要意義。 本文采用riedman (FR), Flynn-Wall-Ozawa (FRO), Kissinger-Akahira-Sunose (KAS)三種非模型法計算并繪制了WHUT-Esys208環(huán)氧樹脂體系的固化速率和活化能與固化度的關(guān)系曲線,分析了環(huán)氧樹脂體系的固化反應(yīng)階段和固化行為。研究表明,固化反應(yīng)逐漸從自催化反應(yīng)機(jī)理轉(zhuǎn)變?yōu)閚階反應(yīng)機(jī)理,這與模型擬合法研究的結(jié)果基本吻合。三種非模型擬合法都能較好地表征該體系的固化行為,其中KAS法的結(jié)果最能準(zhǔn)確地反映該體系的固化行為,FWO法的結(jié)果略有偏差,FR法僅趨勢與另兩種一致。 研究運(yùn)用超聲波在線監(jiān)測方法監(jiān)測WHUT-Esys108室溫固化環(huán)氧樹脂系統(tǒng)的固化過程。研究表明,隨著固化的進(jìn)行,超聲波的振幅值和能量值均不斷發(fā)生變化。將其繪制成曲線后能在一定程度上反映樹脂體系的固化過程。通過公式計算出在固化過程中的超聲衰減并繪圖,可以明顯區(qū)分出固化反應(yīng)的不同階段,實(shí)現(xiàn)超聲波幅值變化與固化反應(yīng)進(jìn)程表征的結(jié)合。 研究固化保溫溫度和固化升溫速率對固化后復(fù)合材料力學(xué)性能的影響,并結(jié)合光學(xué)顯微鏡研究固化參數(shù)與微觀形貌之間的關(guān)系。研究表明,該樹脂體系存在最佳固化溫度：在保溫時間60min,升溫速率2℃/min下,實(shí)驗(yàn)得到的最佳溫度為120℃；不同升溫速率對復(fù)合材料的拉伸性能有一定影響,總體上呈現(xiàn)為升溫速率越慢固化后復(fù)合材料的力學(xué)性能越好,但具體原因尚待確定。
[Abstract]:The curing process of composite materials is studied in depth. The ultrasonic technology is used to monitor the curing process in real time and on-line. The effect of different curing parameters on the properties of the cured materials is analyzed in order to develop a better curing process. It is of great significance to realize the controllable curing process. In this paper, the curing rate, activation energy and curing degree of WHUT-Esys208 epoxy resin system are calculated and plotted by using three kinds of non-model methods: riedman FRX, Flynn-Wall-Ozawa FRON and Kissinger-Akahira-Sunose Kass. The curing reaction stage and curing behavior of WHUT-Esys208 epoxy resin system are analyzed. The curing reaction gradually changed from the self-catalytic reaction mechanism to the n-order reaction mechanism, which is basically consistent with the results of the model fitting method. All three kinds of non-model fitting methods can better characterize the curing behavior of the system. The results of KAS method can best reflect the curing behavior of the system. The results of FWO method are slightly deviated from the results of FWO method and the trend of FR method is only consistent with that of the other two methods. In this paper, the ultrasonic on-line monitoring method is used to monitor the curing process of WHUT-Esys108 epoxy resin system at room temperature. The amplitude value and energy value of ultrasonic wave change continuously. The curve can reflect the curing process of resin system to a certain extent. The ultrasonic attenuation during the curing process is calculated and plotted by formula. The different stages of curing reaction can be distinguished obviously, and the combination of ultrasonic wave amplitude change and the characterization of curing reaction process can be realized. The effects of curing temperature and heating rate on the mechanical properties of the composites were studied. The relationship between the curing parameters and the microstructure of the composites was studied by means of optical microscope. The optimum curing temperature of the resin system is 120 鈩，

本文編號：1661983