【摘要】 从实验及数值模拟两个方面研究均一波纹缺陷对复合材料层合板刚度影响。采用VARI成型工艺制作复合材料波纹板试样,通过压缩测试测得其主杨氏模量和泊松比。利用有限元分析软件ANSYS构建复合材料波纹板模型,预测压缩载荷下复合材料波纹板的刚度,研究纤维体积分数和波纹比对刚度影响。结果表明,纤维波纹对复合材料刚度有很大的影响,尤其是Ex的下降趋势非常明显;在纤维最大偏转角处,试样易发生剪切破坏;波纹比对波纹板刚度影响的变化趋势几乎不受纤维体积含量的影响,实验结果与ANSYS模拟结果有较好的一致性。更多还原

【Abstract】 The effects of uniform waviness on the stiffness of composite laminates have been investigated numerically and experimentally. The VARI process is employed to manufacture the specimens with fiber waviness,and the compression test is conducted to obtain the major Young’s modulus and Poisson’s ratio. Based on the finite element analysis software ANSYS,the laminates with fiber waviness is simulated and the stiffness is predicted for different fiber volume contents and waviness ratios. The results show that the fiber waviness has significant influence on the stiffness of composite laminates. Especially the Exhas a great decrease. The shear failure is prone to initiate at the position of the maximum fiber off-axis angle for most specimens. Furthermore,with the increase of waviness ratio,the fiber volume content has little influence on the variation trend of stiffness. The predictions agree well with the experimental data.更多还原