导　　师： 邱冠雄;李嘉禄

学科专业： H2101

授予学位： 博士

作　　者： ;

机构地区： 天津工业大学

摘　　要： 为了加快这种新型复合材料的推广和应用,该论文系统研究了mbwk织物增强复合材料的结构、面内力学性能,并探讨了该类复合材料在防弹领域的应用.首先研究了复合材料结构中的线圈结构.通过实验研究发现,不同于机织物、编织物等传统的纺织复合材料,mbwk织物增强复合材料结构有其独特之处:该结构由三个系统的纱线组成,纬编组织呈立体状成圈.我们经过合理分解复合材料的内部结构,对实际结构作了必要的简化之后,得到了可以进行几何和力学分析的结构单元,也就是说,线圈结构可以用数学方法描述,所以该论文第一次提出了mbwk织物增强复合材料线圈结构的几何模型并分析了这种复合材料整体的结构形态特点.为了改善几何法建立线圈模型的不足,并且对这种复合材料的成型工艺提供理论指导,该论文从计算机图形学角度出发,利用当今世界发展较快、具有广泛应用价值的非均匀有理b样条(nurbs)方法对此种复合材料的线圈结构进行了模拟.nurbs插值曲线能够直接体现线圈的形态,不仅直接反映线圈纱线在空间的分布及取向,而且可以简化mbwk织物增强复合材料结构的数学描述.论文还对这两种拟和曲线的结果作了对比.其次,该文结合复合材料经典层合板理论(clt)研究了mbwk织物增强复合材料的面内力学性能.具体分三个方面:其一根据纤维束的纺织构造找出其组织细胞种类和每种细胞的纤维束结构.其二是确定在细胞所定义的空间中包含的纤维束数和每根纤维束在该空间的几何位置以及纤维束之间的关联状况;第三点是所有细胞都应看作是进行力学分析和物理性能估算的微观力学模型,由此可以求得mbwk织物增强复合材料的刚度矩阵或柔度矩阵,以及相应的弹性常数.最后,该文还将mbwk织物结构引入防弹复合材料中,对由该类复合材料制成的防弹板防弹效果进行了定量试验研究. As a novel type of directionally oriented textile structural material, Multi-layered Biaxial Weft Knitted /(abbreviated as MBWK/) fabric /(Patented by Composite Research Institute, Tianjin Polytechnic University/) was firstly applied to the laminate. This new kind of composite is attracting more and more interests and attention due to its outstanding mechanical properties and competitive production cost. It possesses a great application potential in the field of aerospace quality components, automotive frames, marine parts, military industry, construction industry, etc. According to the previous investigations, the research on the geometric configuration and mechanical properties of MBWK fabric reinforced composite is blank, so it goes without doubting that the study in this field is of most importance. In order to quicken and broaden the applications, this paper systematically studied the loop structure, in-plane mechanical and ballistic properties of MBWK reinforced composite. The loop structure was firstly studied in this paper. Generally speaking, MBWK fabric reinforced composite structure is much more different from those of traditional textiles: the reinforced fabric is composed of three yarn systems, warp inserting yarns, weft inserting yarns and stitching loops, of which the stitching loop goes in 3-dimensional space. Although this structure is comparatively complex, it still can be divided into sub-strctures to study. This paper puts forward for the first time the loop geometric model of MBWK fabric reinforced composite. And based on this research, the total structural model for the MBWK fabric reinforced composite was also derived subsequently. In addition, the Non-Uniform Rational B-Spline Curve /(NURBS for abbriv./), an engineering standard method in modern scientific research, was applied to simu late in detail the loop structure in order to study the 3-dimensional structure of MBWK fabric reinforced composite, predict mechanical response when stressed or deformed and instruct the forming process. The 3D effect of loop structure can be expressed even more clearly by means of NURBS method. However, the actual calculation is relatively time-consuming. On the other hand, this idea may be adopted in constructing geometric models for other kinds of composites. Secondly, the Classic Laminate Theory /(CLT for abbreviation./) was applied to study the in-plane mechanical properties of composite. Based on the research results about the unit cell structure of MBWK fabric reinforced composite, it is reasonable that the CLT should be taken into consideration in modeling the mechanical relationship. The model of the in-plane stress-strain relationship for MBWK fabric reinforced laminated composite was established for the first time under some assumptions and simplifications. Furthermore, the shear properties of MBWK fabric reinforced composite were also studied in this paper theoretically. According to the experimental results, the theoretical models mentioned above meet the experimerntal data vey well. Finally, as an application example, the MBWK fabric reinforced composite ballistic laminate was studied for the first time. The fiber material used in this study was Ultra High Molecular Weight Polyethylene /(UHMWPE/), the most popular in the protection field. The experimental phenomena and testing results were analyzed and discussed in detail. It was shown that this product has excellent mechanical properties and good bullet-impact resistance, which lends it a great potential in the field of ballistic materials and industrial application.

关 键 词： 纬编双轴向多层衬纱织物增强复合材料 复合材料 线圈结构模型 面内应力应变关系 剪切性能 防弹性能

分 类 号： [TS101.2 TB332]

领　　域： [轻工技术与工程] [轻工技术与工程] [一般工业技术]