摘要
基于针刺石英/石英复合材料的细观结构,建立了考虑编织结构的单胞模型;引入周期性边界条件以及体素单元(Voxel)网格,建立单胞的有限元分析模型;假设针刺复合材料的非线性力学行为主要由基体产生,将针刺过程对复合材料力学性能的影响等效为复合材料基体性能的改变,使用J2塑性模型对基体性能进行修正;采用最大主应力准则、Mises应力准则以及Tsai-Wu失效准则作为各组分材料的失效判据,并将纤维束的失效模式进行区分,根据主损伤模式对相应方向的刚度性能进行折减,模拟了针刺石英/石英复合材料在单轴拉伸载荷下的渐进损伤过程。得到的仿真结果与试验曲线较为吻合,并且利用修正的基体本构模型,较好地表现了针刺复合材料的非线性特征。在完成以上工作的基础上,分析了经线纬线所成角度对复合材料拉伸性能的影响,可为后续针刺复合材料的力学性能设计提供一定的理论依据。
Based on the microscopic structure of needle-punching quartz/quartz composite material, a representative volume elements considering the weaving structure was established. Then by introducing periodic boundary conditions and Voxel mesh, the finite element analysis model of the RVE is established. Assuming that the nonlinear mechanical behavior of needle-punching composites is mainly generated by the matrix, the effect of needling process is equivalent to the change of the matrix properties of composites. In order to do this, the properties of the matrix were modified using the J2 plastic model. Maximum principal stress criterion, Mises stress criterion and Tsai-Wu failure criterion were used as the failure criteria for each component. And, according to the different failure modes of fiber bundles, the stiffness reduction was conducted in the failed elements. The progressive damage process of needle-punching quartz/quartz composite material under uniaxial tensile load was simulated. The simulation results are in good agreement with the test curve, and the modified matrix shows the nonlinear characteristics of the needling composite well. On the basis of the above work, the influence of braiding angle on the tensile properties of the composite was analyzed. This dissertation would be helpful to guide the manufacturing and design of needle-punching composite material in the engineering.
作者
付金毅
孙向春
FU Jin-yi;SUN Xiang-chun(Beijing 1nstitute of Space Long March Vehicle,Beijing 100076,China)
出处
《复合材料科学与工程》
CAS
北大核心
2021年第4期111-118,共8页
Composites Science and Engineering
关键词
针刺复合材料
二维编织
渐进损伤
细观力学
拉伸性能
J2塑性模型
needle-punching composites
2-D braided
progressive damage
micromechanics
tensile properties
J2-plasticity model
作者简介
付金毅(1996-),男,硕士研究生,主要从事飞行器设计方面的研究,fujinyil23@qq.como。
