【作者】 李志江；

【导师】 顾伯洪； 孙宝忠；

【作者基本信息】 东华大学 ， 纺织材料与纺织品设计， 2011， 硕士

【摘要】 三维角链锁机织复合材料是3D复合材料中的一个重要分支,其层间连接强度远远高于层合复合材料。3D角链锁机织物主要包括通厚度角链锁结构与层层角链锁结构两种。由于3D角链锁机织物复合材料具有较高的冲击损伤容限,研究3D角链锁机织复合材料的弹道冲击性能对于个体防护设计着十分重要的意义。本课题根据3D角链锁机织复合材料的细观结构,建立单胞模型从单胞尺度研究其弹道冲击性能。单胞模型将3D角链锁机织复合材料简化为经纱、纬纱与树脂三种组分,并定义各组分刚度矩阵及其破坏准则。采用FORTRAN语言,编写基于单胞模型的用户子程序(VUMAT)。通过ABASUS调用子程序,从单胞层次研究3D角链锁复合材料的弹道冲击性能,且与实验数据进行对比,证明VUMAT的可行性。本论文的主要工作是：(1)设计并织造3D角链锁芳纶机织物,借助真空辅助树脂转移成型技术制造3D角链锁机织物环饱和聚酯复合材料；(2)测试3D角链锁机织复合材料弹道冲击性能,记录一系列入射速度下的弹体剩余速度,同时观测复合材料冲击破坏形态；(3)基于3D角链锁机织复合材料单胞模型和临界失效面积破坏准则(CDA)编写用户子程序(VUMAT),联合ABAQUS计算复合材料弹道侵彻破坏。比较实验和有限元计算结果,发现两者在弹体剩余速度复合材料破坏形态上有很好的一致性。本文研究为3D角链锁机织复合材料在弹道防护中的应用提供了一种设计方案,所得实验结论和相应计算方法可以指导高性能装甲板设计。更多还原

【Abstract】 As one of 3D woven composite,3D angle-interlock woven composite (3DAWC) has higher fracture toughness and delamination resistance than that of laminated composite because of yarns run through thickness direction. Three-dimensional angle-interlock woven composite is more attractive in engineering owing to the 3D angle-interlock woven fabric can be manufactured in a traditional loom with high efficiency. Angle interlock weaving is a technique in which yarns are placed at an angle to the thickness direction to resist delamination. Three-dimensional interlock wove fabric can be classified into two types, referred as layer to layer angle interlock woven fabric and through-thickness angle interlock woven fabric. It is valuable to study the ballistic behavior of the 3D angle-interlock composites because of the wide potential applications in engineering, especially in the case of impact loading condition.Unit cell model that based on the microstructure of the 3D angle interlock woven composite was established to investigate impact deformation and damage. In the unit cell model, the composite was simplified into a combination of resins, weft yarns and warp yarns to define the stiffness matrix and failure evolution of the material. VUMAT (FORTRAN vectorized user-material) subroutine which based on the unit cell model has been developed and connected with commercial FEM code ABAQUS to calculate the ballistic impact damage and energy absorption of the composite. The experimental and FEM results of residual velocities of the projectile, and damages of the composite target were compared. Good agreement between experimental and theoretical proves the unit cell model and the VUMAT subroutine are reasonable for ballistic performance design of the 3D angle interlock woven composite.The main researches conducted are as follows:(1) 3D angle interlock woven fabric with Twaron (PPTA) fiber tows was designed to manufacture in a tradition loom. Unsaturated polyester resin was injected into the 3D angle-interlock woven fabric with Vacuum assisted resin transfer molding (VARTM) technique.(2) A series of ballistic impact experiments were conducted. The strike and residual velocities of the projectiles were measured to calculate strike velocity vs. residual velocity curves. The impact damage morphologies were photographed to reveal the impact damage mechanisms.(3) Based on unit-cell model of the 3D angle interlock woven composites and critical damage area (CDA) criteria, a user-defined materials subroutine was established. VUMAT (FORTRAN vectorized user-material) connected with commercial FEM code ABAQUS to calculate the impact damage evolution and energy absorption of the composite. The experimental and FEM results of residual velocities of the projectile, and damages of the composite target were compared. These are good agreements between experimental observation and FEM calculation.The results provide the design methodology of the 3D angle interlock woven composite in ballistic protection. With the scheme, the high performance ballistic armor could be design effectively.更多还原