Numerical Analysis of Damage Development for Woven Fabric Composite under Off-Axis Loading
Numerical Analysis of Damage Development for Woven Fabric Composite under Off-Axis Loading
复制标题
机织物复合材料在离轴载荷下损伤发展的数值分析
DOI：
10.2472/jsms.61.434
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Kurashiki
中科院分区：
文献类型：
--
作者：
Y. Fujita;T. Kurashiki
本研究提出了一种机织复合材料在离轴载荷作用下力学性能的数值估算方法。虽然有限元已被广泛应用于玻璃钢结构的力学性能评估或结构优化，以节省设计成本，但由于其复杂的边界条件，纤维复合材料在离轴载荷作用下的力学行为，特别是损伤发展还没有得到有限元的估计。作为机织复合材料的有限元分析方法，采用了周期边界条件的单胞方法。采用基于相对位移向量的周期性边界条件对单元体的离轴方向加载。旋转单元模型，使加载方向变为水平方向。相对位移矢量的长度可以根据单元格的大小和加载角度来计算。该方法还考虑了泊松S效应。该方法可以估计任意面内离轴加载方向的力学行为。采用基于损伤力学的有限元分析方法，对机织复合材料在不同加载方向下的损伤行为进行了表征。结果表明，当加载方向与主轴夹角较大时，初始损伤时的应力减小，以剪应力为主的纤维束发生损伤。该方法也可用于分析其他具有周期性边界条件的玻璃钢的离轴方向，如编织复合材料或非卷曲织物复合材料。
In this study, a numerical method to estimate the mechanical behaviors of woven fabric composite under off-axis loading is proposed. Although FEM has been widely used for the estimation of mechanical behaviors or optimization of the FRP structure to save designing costs, mechanical behaviors, especially damage developments of fibrous composites under off-axis loading haven ’ t been estimated by FEM because of the complex boundary conditions. As the FE method for woven fabric composite, unit cell with periodic boundary conditions has been used. In order to loading to off-axis direction of the unit cell, periodic boundary conditions based on relative displacement vectors are employed. The unit model is rotated so that loading direction become horizontal. The length of the relative displacement vectors can be calculated by the size of unit cell and loading angle. Poisson ’ s effect is also considered in the method. The mechanical behaviors of arbitrary in-plane off-axis loading directions can be estimated by the proposed method. FE analysis based on damage mechanics was carried out and the damage behaviors of woven fabric composites under several loading directions were characterized. As the results, when the angle between loading direction and principal axis is larger, stress when initial damage occur decreased and damage of fiber bundle dominated by shear stress occurred. The proposed method will also contribute to analyze off-axis direction of other FRP with periodic boundary conditions such as braded composites or non-crimp fabric composites.
影响因子：
6.3
作者：
T. Matsuda;Y. Nimiya;N. Ohno;M. Tokuda
通讯作者：
T. Matsuda;Y. Nimiya;N. Ohno;M. Tokuda