發(fā)布時間：2018-02-22 16:18

  本文關(guān)鍵詞： 蜂窩狀 三維機織 復(fù)合材料 三點彎曲測試 有限元分析　出處：《大連工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,普通蜂窩狀復(fù)合材料大多是先將平面材料粘合,再經(jīng)過壓制定型而成。加工時將織物或平面材料分層疊放,在相應(yīng)的部位粘合,經(jīng)過定型,制成蜂窩狀復(fù)合材料。這種制作方法雖然制作工藝簡單,但構(gòu)件的整體性較差,當(dāng)處于高溫高濕環(huán)境中或承受交變外力時,粘接處容易開裂。蜂窩狀三維機織復(fù)合材料是一種以三維整體機織蜂窩狀織物作為增強相,樹脂等為基體復(fù)合而成的具有整體化纖維增強結(jié)構(gòu)、性能極佳的新型復(fù)合材料。此種新型復(fù)合材料可克服上述普通蜂窩狀復(fù)合材料的缺點。其可廣泛用于航空航天、汽車、造船、建筑、倉儲、管道輸送等多個領(lǐng)域,具有廣闊的應(yīng)用前景成為一種重要的結(jié)構(gòu)材料。本論文利用普通織機Y100S,經(jīng)合理設(shè)計,以800tex有捻玻璃纖維紗為經(jīng)紗,以2000tex無捻玄武巖纖維紗為緯紗,低成本織造不同截面形狀(三角形、四邊形、六邊形)的蜂窩狀三維機織物。以蜂窩狀三維機織物為增強材料,以不飽和聚酯樹脂作為基體,通過VARTM成型工藝,制備各種不同結(jié)構(gòu)的蜂窩狀三維機織復(fù)合材料。利用TH-8102S伺服電腦式萬能強力試驗機,測試四種不同速度(2mm/min,10mm/min,20mm/min,50mm/min)下蜂窩狀三維機織復(fù)合材料的三點彎曲性能,得到復(fù)合材料彎曲載荷-位移曲線,最大彎曲載荷-速度曲線,能量吸收柱狀圖。分析得到同種截面形狀的蜂窩狀三維機織復(fù)合材料隨著加載速度的增加,承受的彎曲載荷值增大;同一速度下不同截面形狀的蜂窩狀三維機織復(fù)合材料,承受彎曲載荷能力表現(xiàn)為截面為六邊形的最優(yōu),截面為三角形的相比較差。同種截面形狀下蜂窩狀三維機織復(fù)合材料的最大彎曲載荷隨著加載速度的增加而增大。同種截面形狀下蜂窩狀三維機織復(fù)合材料的能量吸收值隨著加載速度的增加而增大。蜂窩狀三維機織復(fù)合材料的破形態(tài)壞模式,上表面(與壓桿直接接觸的面)表現(xiàn)為壓縮破壞,下表面表現(xiàn)為拉伸破壞,復(fù)合材料的破壞主要有樹脂的開裂,纖維的抽拔與纖維的斷裂。利用了ABAQUS軟件模擬了蜂窩狀三維機織復(fù)合材料三點彎曲的實驗過程,得到了彎曲載荷-位移曲線,最大彎曲載荷值,材料吸收能量值,材料在不同時刻的應(yīng)力云圖,及材料的破壞形態(tài)模式,并與實驗結(jié)果比對,發(fā)現(xiàn)兩者具有較好的一致性。此模型可參數(shù)調(diào)節(jié),可拷貝移植。其對高沖擊損傷容限的蜂窩狀三維機織復(fù)合材料優(yōu)化設(shè)計有重要意義。
[Abstract]:At present, most ordinary honeycomb composites are made by first bonding the plane material and then pressing it to form it. When processing, the fabric or plane material is laminated and laminated, and the fabric is bonded in the corresponding part, after which the material is shaped. A honeycomb composite is made. Although the fabrication process is simple, the integrity of the component is poor, when it is in a high temperature and high humidity environment or when subjected to alternating external forces, The honeycomb three-dimensional woven composite is a kind of composite made of three-dimensional monolithic woven honeycomb fabric as reinforcement phase, resin, etc., which has an integrated fiber reinforced structure. A new type of composite with excellent properties. This new type of composite can overcome the shortcomings of the ordinary honeycomb composite mentioned above. It can be widely used in aerospace, automobile, shipbuilding, construction, warehousing, pipeline transportation and many other fields, In this paper, using ordinary loom Y100S, by reasonable design, 800 Tex twisted fiberglass yarn as warp yarn and 2000tex untwisted basalt fiber yarn as weft yarn, Three dimensional honeycomb woven fabrics with different cross-section shapes (triangle, quadrilateral, hexagonal) were woven at low cost. The honeycomb three-dimensional woven fabrics were used as reinforcement material and unsaturated polyester resin as matrix, which was formed by VARTM process. Three dimensional honeycomb woven composites with different structures were prepared. The three point bending properties of three dimensional honeycomb woven composites were tested by using TH-8102S servo computer universal strength testing machine at four different speeds of 2 mm / min 10 mm / min 20 mm / min 20 mm / min 5 mm / min. The bending load-displacement curve, the maximum bending load-velocity curve and the energy absorption histogram are obtained. Under the same velocity, the bending load capacity of honeycomb three-dimensional woven composites with different cross-section shape is the best with hexagonal section. The maximum bending load of the honeycomb 3D woven composites increases with the increase of loading speed. The energy of the honeycomb 3D woven composites with the same cross section. The value of absorption increases with the increase of loading speed. The upper surface (the surface directly in contact with the compression rod) is compressed and the lower surface is subjected to tensile failure. The damage of the composite is mainly caused by the cracking of the resin. ABAQUS software was used to simulate the experimental process of three-point bending of honeycomb three-dimensional woven composites. The bending load-displacement curve, maximum bending load value, absorptive energy value of the material were obtained. The stress cloud diagram of materials at different times and the failure pattern of materials are compared with the experimental results. It is found that the two models are in good agreement with each other, and the model can be adjusted by parameters. It is of great significance for the optimum design of honeycomb three-dimensional woven composites with high impact damage tolerance.
【學(xué)位授予單位】：大連工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33

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