Wrinkle defects were found widely exist in the field of industrial products, i.e. wind turbine blades and filament-wound composite pressure vessels. The magnitude of wrinkle wavelength varies from several millimeters to over one hundred millimeters. Locating the wrinkle defects and measuring their responses are very important to the assessment of the structures that containing wrinkle defects. A meso-mechanical modeling is presented based on the homogenization method to obtain the effective stiffness of a graded wrinkle. The finite element simulation predicts the trans-scale response of out-of-plane displacement of wrinkled laminates, where the maximum displacement ranges from nanoscale to millimeter scale. Such trans-scale effect requires different measurement approaches to observe the displacement responses. Here we employed Shearography (Speckle Pattern Shearing Interferometry) and fringe projection profilometry (FPP) method respectively according to the different magnitude of displacement. In FPP method, a displacement extraction algorithm was presented to obtain the out-of-plane displacement. The measurement sensitivity and accuracy of Shearography and FPP are compared, which provides a quantitative reference for industrial non-destructive test.

翻译：褶皱缺陷广泛存在于工业产品领域，如风力发电机叶片和纤维缠绕复合材料压力容器中。褶皱波长尺寸从数毫米到超过一百毫米不等。定位褶皱缺陷并测量其响应对于评估含有褶皱缺陷的结构至关重要。本文基于均匀化方法建立了一种细观力学模型，用于获得梯度褶皱的有效刚度。有限元模拟预测了褶皱层合板离面位移的跨尺度响应，其最大位移范围从纳米级到毫米级。这种跨尺度效应需要采用不同的测量方法来观测位移响应。本文根据位移量级的不同，分别采用剪切散斑干涉术（散斑图案剪切干涉法）和条纹投影轮廓术（FPP）进行测量。在FPP方法中，提出了一种位移提取算法以获得离面位移。比较了剪切散斑干涉术和FPP的测量灵敏度和精度，为工业无损检测提供了定量参考依据。