發(fā)布時間：2018-06-26 00:51

  本文選題：三維機織結(jié)構(gòu) + T字型三維整體機織復合材料　； 參考：《大連工業(yè)大學》2015年碩士論文

【摘要】：T型梁作為一種常見的工程結(jié)構(gòu)件,被廣泛應用在航空航天航海以及建筑等領(lǐng)域。由于不可定因素的存在,可能會遭遇鳥擊、雨雪或冰雹和船只撞擊等造成的一些外部損害。作為復合材料增強體的三維機織結(jié)構(gòu)同三維針織結(jié)構(gòu)和三維編織結(jié)構(gòu)相比,具有特殊的結(jié)構(gòu)特點和優(yōu)異的力學性能,因而設計并制造高彎曲強度和抗沖擊性能的T字型三維整體機織復合材料,應用前景十分可觀。本課題將玻璃長絲束作為經(jīng)紗,玄武巖長絲束作為緯紗在普通小樣織機上低成本織造成三種不同梁高的T字型三維整體機織物,并采用VARTM(Vacuum Assistant Resin Transfer Moulding)成型工藝制備成復合材料。利用電子萬能試驗機測試了三種不同梁高的T字型三維整體機織復合材料在準靜態(tài)下的三點彎曲性能,研究T字型三維整體機織復合材料的破壞模式和能量吸收方式等。從實驗所得的載荷-位移曲線和吸收能量-位移曲線關(guān)系圖來看,隨著位移的增加,梁高為12 mm的T字型三維整體機織復合材料所能承載的載荷和吸收的能量最大,梁高為0mm的T字型三維整體機織復合材料最小。從材料最終破壞形態(tài)來看,梁高為0 mm的材料表現(xiàn)為典型的彎曲破壞模式,正面受壓縮破壞,背面受拉伸破壞,梁高為6 mm和12 mm的材料正面表現(xiàn)為壓縮破壞,背面為剪切破壞�？梢娀�體開裂、纖維與樹脂脫粘和纖維斷裂等破壞是材料彎曲破壞模式中主要的吸收能量方式。在簡支梁沖擊實驗中,T字型三維整體機織復合材料受到的沖擊過程幾乎是一瞬間發(fā)生的,應力傳播非�？�,材料的結(jié)構(gòu)響應基本失效,應力波受到基體開裂等因素的阻礙,應力無法平衡,容易在擺錘接觸材料的位置形成應力集中,造成材料斷裂。其中梁高為12mm的材料吸收能量最多,受到的沖擊強度最大;梁高為0mm的材料吸收能量最少,受到的沖擊強度最小。本課題還基于T字型三維整體機織復合材料試樣的尺寸,建立同尺寸結(jié)構(gòu)的模型,運用ABAQUS有限元軟件模擬計算同種組織結(jié)構(gòu)下三種不同梁高的T字型三維整體機織復合材料的三點彎曲性能,模擬得到的載荷-位移曲線、吸收能量-位移關(guān)系曲線及破壞形態(tài)與實驗結(jié)果相比有較好的一致性�？梢�,所建模型較正確,為今后T字型三維整體機織復合材料彎曲力學性能模擬,提供一定幫助,可反過來為梁高對試樣的影響提供一定指導,減少試驗量。
[Abstract]:As a common engineering structure, T-beam is widely used in aerospace navigation and architecture. Due to uncertainties, some external damage may be caused by bird strikes, rain, snow or hail, and ship impacts. Three-dimensional woven structure, as a composite reinforcement, has special structural characteristics and excellent mechanical properties compared with three-dimensional knitted structure and three-dimensional braided structure. Therefore, the design and manufacture of T-shaped 3D monolithic woven composites with high bending strength and impact resistance have a promising application prospect. In this paper, glass filament beam is used as warp yarn and basalt filament beam is used as weft yarn to weave three kinds of T-shaped three-dimensional woven fabrics with different beam height on ordinary sample loom at low cost, and VARTM (Vacuum Assistant Resin transfer Moulding) process is used to fabricate composite material. The three-point bending behavior of three T-shaped 3D monolithic woven composites with different beam heights was tested by electronic universal testing machine, and the failure mode and energy absorption mode of T-shaped 3D monolithic woven composites were studied. From the load-displacement curve and absorption energy-displacement curve diagram obtained from the experiment, with the increase of displacement, the T-shaped 3D monolithic woven composite with a beam height of 12 mm can carry the maximum load and absorb the energy. The T-shaped three-dimensional monolithic woven composite with 0mm beam height is the smallest. According to the ultimate failure pattern of the material, the material with a beam height of 0 mm shows typical bending failure mode, the front of the beam is subjected to compression damage, the back side of the material is damaged by tensile damage, and the front of the material with the beam height of 6 mm and 12 mm shows compression failure. The back side is shear failure. It can be seen that matrix cracking, fiber and resin debonding and fiber fracture are the main energy absorption modes in the bending failure mode of materials. In the impact test of simply supported beam, the impact process of T-shaped 3D monolithic woven composites is almost instantaneous, the stress propagation is very fast, the structural response of the material is basically invalid, and the stress wave is hindered by the cracking of matrix, etc. The stress can not be balanced, and it is easy to form stress concentration in the position of the pendulum hammer contact material, resulting in material fracture. The material whose beam height is 12mm absorbs the most energy and receives the greatest impact strength, while the material with the beam height of 0mm absorbs the least energy and receives the least impact strength. The model of the same size structure is also established based on the size of T-shaped 3D monolithic woven composite material. By using Abaqus finite element software, the three-point bending behavior of three T-shaped 3D monolithic woven composites with different beam heights under the same structure was simulated, and the load-displacement curves were obtained. Compared with the experimental results, the absorption energy displacement curve and the failure pattern are in good agreement. It can be seen that the established model is more correct, which can provide some help for the simulation of bending mechanical properties of T-shaped 3D monolithic woven composites in the future, which can in turn provide some guidance for the influence of beam height on the specimen, and reduce the amount of test.
【學位授予單位】：大連工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TS106;TB33

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