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复合材料层合板在外界激励下很容易产生层合板表面无法探测到的内部低速冲击损伤,从而引起材料失效甚至破坏。首先通过对低速冲击后的层合板进行目视检测获得了层合板受冲击后的若干损伤特征,然后利用数字散斑干涉测量技术(DSPI)对受到低速冲击的层合板在热载下进行内部低速冲击损伤检测。实验结果表明DSPI技术通过观察散斑干涉条纹的不规则分布即可准确、灵敏识别复合材料层合板表面难以观察到的内部低速冲击损伤,并且通过图像处理技术及相移技术可以准确评估内部低速冲击损伤对复合材料层合板的结构变形带来的影响。
Under the encouragement of the outside world, the composite laminates are prone to the internal low speed impact damage which can not be detected on the surface of the laminate, thus causing the material to fail or even destroy. First of all, some damage characteristics of the laminate after impacting were obtained by visual inspection of the laminate after low-velocity impact, and then the digital low-impact impact laminate was subjected to internal low-speed under the thermal load using Digital Speckle Interferometry (DSPI) Impact damage detection. The experimental results show that the DSPI technology can accurately and sensitively detect the internal low-speed impact damage that is difficult to observe on the surface of composite laminates by observing the irregular distribution of speckle interference fringes, and can accurately estimate the internal low-speed impact through the image processing and phase-shift techniques Effect of damage on the structural deformation of composite laminates.