本文選題：形狀記憶 + 碳纖維�。� 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：形狀記憶聚合物是一種智能材料,它可在沒有外界機(jī)械輔助條件下主動(dòng)變形,完成“記憶初始態(tài)-固定變形態(tài)-恢復(fù)初始態(tài)”的形狀記憶過(guò)程。將碳纖維材料作為增強(qiáng)體與其復(fù)合,可生產(chǎn)出高性能形狀記憶碳纖維復(fù)合材料,兼顧兩種材料的優(yōu)異性能,但這種復(fù)合材料的生產(chǎn)工藝比較復(fù)雜。3D打印技術(shù)可生產(chǎn)形狀復(fù)雜的零件,將它應(yīng)用于復(fù)合材料成型工藝,對(duì)于促進(jìn)形狀記憶碳纖維復(fù)合材料的發(fā)展和拓展3D打印技術(shù)的應(yīng)用具有重要意義。本文研究了環(huán)氧樹脂、聚乳酸(PLA)和氰酸脂三種形狀記憶復(fù)合材料的重要性能,設(shè)計(jì)了一種3D打印碳纖維復(fù)合材料工藝,測(cè)試了3D打印形狀記憶碳纖維復(fù)合材料的力學(xué)性能,分析了3D打印形狀記憶復(fù)合材料的回復(fù)率情況,并對(duì)打印試樣進(jìn)行了性能表征。研究了形狀記憶聚合物及其復(fù)合材料本構(gòu)關(guān)系,采用真空袋成型法制備碳纖維環(huán)氧樹脂復(fù)合材料,并對(duì)復(fù)合材料動(dòng)態(tài)和靜態(tài)性能進(jìn)行了測(cè)試,實(shí)驗(yàn)比較了不同鋪層方式的復(fù)合材料力學(xué)性能差異。實(shí)驗(yàn)還進(jìn)行了碳纖維氰酸脂復(fù)合材料片層回復(fù)率與回復(fù)力的測(cè)試。設(shè)計(jì)了復(fù)合材料的3D打印工藝方案,根據(jù)該方案對(duì)reprap prusa i3打印機(jī)進(jìn)行了改造和調(diào)試。并研究了以PLA為基體的碳纖維復(fù)合材料性能。為了提高打印性能,構(gòu)建了打印機(jī)噴頭的三維模型,研究分析了打印機(jī)擠出機(jī)構(gòu)驅(qū)動(dòng)力情況,分析了打印噴頭的溫度場(chǎng)。用雙螺桿擠出機(jī)制備了碳纖維PLA復(fù)合材料線材,利用打印機(jī)成功打印出了碳纖維復(fù)合材料試件。研究了在不同打印溫度、速度、層厚下碳纖維復(fù)合材料打印試件的力學(xué)性能,通過(guò)實(shí)驗(yàn)對(duì)比分析了不同打印參數(shù)對(duì)試件力學(xué)性能的影響。表征了3D打印復(fù)合材料試件的力學(xué)性能,利用掃描電鏡表征了碳纖維復(fù)合材料斷口形貌特征、碳纖維在基體中的分布情況,探究了不同溫度的碳纖維PLA復(fù)合材料中基體與增強(qiáng)體的形貌變化,測(cè)試了3D打印碳纖維PLA復(fù)合材料的形狀回復(fù)情況。
[Abstract]:Shape memory polymer (SMA) is a kind of intelligent material, which can deform actively without external mechanical assistance, and complete the shape memory process of "memory initial state-fixed variable shape-restore initial state". High performance shape memory carbon fiber composites can be produced by using carbon fiber materials as reinforcements and the excellent properties of the two materials can be taken into account. But the production process of this composite material is quite complex. 3D printing technology can produce parts with complex shape, and it can be applied to the molding process of composite material. It is of great significance to promote the development of shape memory carbon fiber composites and expand the application of 3D printing technology. In this paper, the important properties of three kinds of shape memory composites, epoxy resin, polylactic acid (PLA) and cyanide, were studied. A 3D printed carbon fiber composite was designed, and the mechanical properties of 3D printed shape memory carbon fiber composites were tested. The recovery rate of 3D printed shape memory composites was analyzed and the properties of printed samples were characterized. The constitutive relationship of shape memory polymer and its composites was studied. Carbon fiber epoxy resin composites were prepared by vacuum bag molding. The dynamic and static properties of the composites were tested. The mechanical properties of the composites with different layering methods were compared experimentally. The recovery rate and recovery force of carbon fiber cyanide composites were also tested. The 3D printing process of composite material was designed, according to which the reprap prusa i3 printer was modified and debugged. The properties of carbon fiber composites based on PLA were studied. In order to improve the printing performance, the 3D model of printer nozzle was constructed, the driving force of printer extrusion mechanism was analyzed, and the temperature field of printer nozzle was analyzed. Carbon fiber PLA composite wire was prepared by twin-screw extruder, and the carbon fiber composite specimen was successfully printed by printer. The mechanical properties of carbon fiber composites (CFRP) printed at different printing temperature, speed and thickness were studied, and the effects of different printing parameters on the mechanical properties were compared and analyzed. The mechanical properties of 3D printed composites were characterized. The fracture morphology of carbon fiber composites and the distribution of carbon fibers in the matrix were characterized by scanning electron microscope (SEM). The morphologies of matrix and reinforcements in carbon fiber PLA composites at different temperatures were investigated and the shape recovery of 3D printed carbon fiber PLA composites was tested.
【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】：2017
【分類號(hào)】：TB381;TP391.73

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