本文關(guān)鍵詞：基于不同三維機織結(jié)構(gòu)的碳纖復合材料整體力學性能研究　出處：《東華大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 三維正交結(jié)構(gòu) 角聯(lián)鎖結(jié)構(gòu) 碳纖復合材料 綜合力學性能 VARI工藝

【摘要】：隨著先進樹脂基復合材料在航空領(lǐng)域用量的不斷增加,碳纖復合材料,作為先進樹脂基復合材料的一種,已經(jīng)成為最受關(guān)注的材料研究方向之一。傳統(tǒng)層合板復合材料具有優(yōu)良的面內(nèi)力學性能,但Z向性能相對薄弱,易分層,低能量沖擊損傷大,而且人工鋪層成本高、效率低。因此,對一些外形復雜的復合材料結(jié)構(gòu)設計,其增強體結(jié)構(gòu)的選取正逐步轉(zhuǎn)向于三維紡織結(jié)構(gòu)。對于三維紡織結(jié)構(gòu)復合材料的研究多集中于三維預制件成型設計和面內(nèi)經(jīng)緯向力學性能對比,而缺乏三維紡織結(jié)構(gòu)復合材料整體力學性能分析,與三維增強體預制件結(jié)構(gòu)之間的關(guān)聯(lián)研究較少。本課題以不同三維機織結(jié)構(gòu)為基礎,設計織造碳纖維三維機織結(jié)構(gòu)增強體預制件,制備復合材料板,對比三種典型三維機織結(jié)構(gòu)(淺交彎聯(lián)、淺交直聯(lián)和三向正交)的復材板結(jié)構(gòu)性能差異,綜合分析其整體力學性能,為復合材料增強體結(jié)構(gòu)性能設計和實際應用提供參考依據(jù)。首先,利用T800碳纖維在劍桿織機上織造淺交彎聯(lián)、淺交直聯(lián),及三向正交機織結(jié)構(gòu)的預制件;通過USB電子顯微鏡表征織物試樣表面形態(tài)。結(jié)果表明:三種結(jié)構(gòu)預制件表面都有部分紗線損傷,其中,淺交彎聯(lián)結(jié)構(gòu)預制件表面斷纖毛絲最多,淺交直聯(lián)結(jié)構(gòu)預制件表面斷纖毛絲最少;隨后,采用液體真空輔助成型(VARI)工藝,通過合理設計導流網(wǎng)形狀尺寸,制備三種不同三維機織結(jié)構(gòu)的碳纖復合材料。依據(jù)ASTM測試標準,對不同結(jié)構(gòu)的復合材料測試板件進行力學測試樣條尺寸設計及切割,從XYZ三個方向進行拉伸、彎曲、壓縮,以及短梁剪切四種不同類型的力學性能測試,對比分析三種結(jié)構(gòu)碳纖復合材料的各方向力學性能差異。根據(jù)對比可知:三向正交結(jié)構(gòu)由于內(nèi)部紗線伸直度最好,增強體預制件對復合材料制品的性能貢獻最大,經(jīng)向力學性能最好;淺交直聯(lián)結(jié)構(gòu)由于經(jīng)紗屈曲度小,而且經(jīng)緯聯(lián)鎖交織狀態(tài)清晰,各方面力學性能較為均衡,而且織物可織性最好,為三維機織復合材料增強體結(jié)構(gòu)選取的最佳選擇;淺交彎聯(lián)結(jié)構(gòu)由于頻繁的交織聯(lián)鎖,織物可織性最差,抗分層效果最好,但其他方面力學性能差,整體結(jié)構(gòu)性能最差。最后,引入指定零部件,根據(jù)零件XYZ三方向極限載荷需求,設定XYZ三方向力學性能加權(quán)系數(shù),整合計算了三種結(jié)構(gòu)復合材料的綜合壓縮性能,從而設計了一種力學性能綜合評價的方法,可為不同復合材料零部件所采用機織結(jié)構(gòu)的選取提供參考依據(jù)。
[Abstract]:With the increasing amount of advanced resin matrix composite materials in aerospace, carbon fiber composite material, as a kind of advanced composite materials, has become one of the most popular research direction. The traditional laminated composite materials have excellent in-plane mechanical properties, but Z performance is relatively weak, easy to layer, low energy the impact damage, and artificial layer of high cost and low efficiency. Therefore, the composite structure with complex shape design, its structure is gradually enhanced from turning to 3D textile structure. For the study of 3-D textile structural composites are more concentrated in the 3D preform molding design and in-plane mechanical properties compared to the latitude the lack of overall analysis, the mechanical properties of 3-D textile structural composites, and three-dimensional contrast-enhanced studies of the association between prefabricated parts structure less. In this paper the structure of the organization of different 3D machine Based on the design of weaving structure of 3D woven carbon fiber preform, preparation of composite panels, three kinds of typical 3D woven structure contrast (Curved Shallow crossing linking, shallow AC DC and three orthogonal) complex structure difference properties of plates, the overall mechanical performance analysis, to provide reference for the design of structure and performance the practical application of reinforced composite material. Firstly, the rapier loom weaving Curved Shallow crossing linking with T800 carbon fiber, straight shallow crossing linking, and three to preform orthogonal woven structure; by USB electron microscopy characterization of fabric surface morphology. The results showed that: there are three kinds of yarn part damage, structure of prefabricated the surface of the curved shallow crossing linking structure of preform surface broken fiber filament most straight shallow crossing linking structure of preform surface broken fiber filament at least; then, the liquid vacuum assisted molding (VARI) process, through the reasonable design of diversion net shape and size, preparation Three kinds of carbon fiber composite materials with different 3D woven structures. According to the ASTM standard test, mechanical test and cutting spline size design of different structures of the composite test plate, stretching from three directions, XYZ bending, compression, and short beam shear of four different types of mechanical testing, comparison and analysis of the direction the mechanical properties of the structure difference of three kinds of carbon fiber composite material. According to the comparison: three orthogonal structure due to internal yarn straightness best contribution to the enhanced performance of composite products prefabricated parts, the best mechanical properties; straight shallow crossing linking structure due to warp flexion, and warp interlock intertwined the clear. The mechanical properties are more balanced and weavability best for 3D woven composites reinforced the best choice structure selection; Curved Shallow crossing linking structure due to frequent interleaving interlock, Weavability is the worst, the delamination effect is best, but other aspects of mechanical performance is poor, the worst performance of the whole structure. Finally, the introduction of the specified parts, parts according to the XYZ three direction limit load demand, set XYZ three mechanical properties of weighted coefficient, calculate the comprehensive integration compression performance of three kinds of structure of composite materials. In order to design a method of comprehensive evaluation of mechanical properties, can be used to select different parts of composite woven structure to provide reference.

【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332;TS106

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