蜂窝状三维机织复合材料力学性能及有限元分析计算

发布时间：2018-02-22 16:18

本文关键词： 蜂窝状三维机织复合材料三点弯曲测试有限元分析　出处：《大连工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,普通蜂窝状复合材料大多是先将平面材料粘合,再经过压制定型而成。加工时将织物或平面材料分层叠放,在相应的部位粘合,经过定型,制成蜂窝状复合材料。这种制作方法虽然制作工艺简单,但构件的整体性较差,当处于高温高湿环境中或承受交变外力时,粘接处容易开裂。蜂窝状三维机织复合材料是一种以三维整体机织蜂窝状织物作为增强相,树脂等为基体复合而成的具有整体化纤维增强结构、性能极佳的新型复合材料。此种新型复合材料可克服上述普通蜂窝状复合材料的缺点。其可广泛用于航空航天、汽车、造船、建筑、仓储、管道输送等多个领域,具有广阔的应用前景成为一种重要的结构材料。本论文利用普通织机Y100S,经合理设计,以800tex有捻玻璃纤维纱为经纱,以2000tex无捻玄武岩纤维纱为纬纱,低成本织造不同截面形状(三角形、四边形、六边形)的蜂窝状三维机织物。以蜂窝状三维机织物为增强材料,以不饱和聚酯树脂作为基体,通过VARTM成型工艺,制备各种不同结构的蜂窝状三维机织复合材料。利用TH-8102S伺服电脑式万能强力试验机,测试四种不同速度(2mm/min,10mm/min,20mm/min,50mm/min)下蜂窝状三维机织复合材料的三点弯曲性能,得到复合材料弯曲载荷-位移曲线,最大弯曲载荷-速度曲线,能量吸收柱状图。分析得到同种截面形状的蜂窝状三维机织复合材料随着加载速度的增加,承受的弯曲载荷值增大;同一速度下不同截面形状的蜂窝状三维机织复合材料,承受弯曲载荷能力表现为截面为六边形的最优,截面为三角形的相比较差。同种截面形状下蜂窝状三维机织复合材料的最大弯曲载荷随着加载速度的增加而增大。同种截面形状下蜂窝状三维机织复合材料的能量吸收值随着加载速度的增加而增大。蜂窝状三维机织复合材料的破形态坏模式,上表面(与压杆直接接触的面)表现为压缩破坏,下表面表现为拉伸破坏,复合材料的破坏主要有树脂的开裂,纤维的抽拔与纤维的断裂。利用了ABAQUS软件模拟了蜂窝状三维机织复合材料三点弯曲的实验过程,得到了弯曲载荷-位移曲线,最大弯曲载荷值,材料吸收能量值,材料在不同时刻的应力云图,及材料的破坏形态模式,并与实验结果比对,发现两者具有较好的一致性。此模型可参数调节,可拷贝移植。其对高冲击损伤容限的蜂窝状三维机织复合材料优化设计有重要意义。
[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.
【学位授予单位】：大连工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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