Abstract

A new method combining three-dimensional digital image correlation (3D-DIC) with a novel numerical framework was proposed to evaluate the severity of wrinkles in composite laminates. In this numerical framework, the micromechanics model of wrinkles based on a two-step homogenization technique was embedded in three-dimensional finite element method (FEM). The influence of waviness ratio (the ratio of wrinkle amplitude to wavelength) and stacking sequence on mechanical behaviors of wrinkled laminates under axial tension load was studied. Numerical results showed that the out-of-plane displacement in the vicinity of wrinkle zones obviously increases by 10%–20%. The simulation was then verified by experimental observations.

摘要

提出了一种将三维数字图像相关 (3D-DIC) 与新型数值框架相结合的新方法，用于评估复合材料层合板中皱纹的严重程度。在此数值框架中，基于两步均匀化技术的皱纹微观力学模型被嵌入到三维有限元法 (FEM) 中。研究了波纹比（褶皱振幅与波长的比值）和堆叠顺序对轴向拉伸载荷作用下褶皱层合板力学行为的影响。数值结果表明，皱纹区附近的面外位移明显增加了10%~20%。然后通过实验观察验证模拟。