Optical evaluation of the buckling behavior of stiffened composite laminates
Optical evaluation of the buckling behavior of stiffened composite laminates
复制标题
DOI：
10.1016/j.compositesa.2012.07.007
复制
发表时间：
2012-11
影响因子：
8.7
通讯作者：
Lei Zhenkun;Bai Rui-xiang;Qiu Wei;Zhan Lechang
中科院分区：
文献类型：
--
作者：
Lei Zhenkun;Bai Rui-xiang;Qiu Wei;Zhan Lechang
数字条纹投影轮廓术（FPP）具有非接触、全场测量、设备简单、精度高、可实现实时轮廓自动化等优点，适用于物体表面轮廓的检测。利用我们的技术，四个相移正弦条纹图案圆形投影到一个复合材料层合板的表面加强与交叉肋。采用相移法对压缩过程中的表面形貌变化进行了检测。结果表明，不同交叉肋处的局部屈曲挠度方向不同，波谷位于中间，波峰位于两端。从挠度分析的细节中可以看出，复合材料壁板的局部屈曲与整体弯曲是耦合的。局部屈曲挠度与有限元法（FEM）模拟结果吻合良好。
Digital fringe projection profilometry (FPP) is suitable to inspect the surface profiles of objects with some apparent advantages such as being non-contact, making full-field measurement, using simple apparatus, being of high precision and enabling real-time profile automation. With our technique, four phase-shifted sinusoidal fringe patterns were circularly projected onto the surface of a composite laminate panel reinforced with crossed ribs. A phase shifting method was applied to inspect the surface profile variations during compression. The profile results revealed that different deflection directions of local buckling appeared at different crossed ribs, with the wave valleys located at the middle and the wave peaks occurring at the composite panel ends. From the details of the deflection analysis, it has been seen that the local buckling couple with the whole bending of the composite panel. The local buckling deflections agree well with finite element method (FEM) simulations.