Abstract
A method for real time 3D measurements based on three-color digital holographic interferometry is presented and applied to the investigation of fracture mechanisms in laminate composite submitted to a three point flexural loading. A convolution algorithm allows the three monochrome images to be superposed to provide simultaneous full-field 3D measurements. Experimental results are presented and exploited to obtain the evolution of the crack tip propagation during the test.
Highlights
Composite materials are used very efficiently in structures aeronautics, automobile transport, and the shipbuilding or in the building clearly increased during these last ten year
Others authors developed methods based on speckle interferometry (SLBI), which are efficiently used in several interferometriy techniques as an information carrier of the macroscopic wave front distortion induced by the surface displacement field of the object under investigation [4,5,6]
We present in this paper a method of realtime 3D deformation measurements based on three-color digital holography and simultaneous recording with a stack of photodiodes image sensor
Summary
Composite materials are used very efficiently in structures aeronautics, automobile transport, and the shipbuilding or in the building clearly increased during these last ten year. Others authors developed methods based on speckle interferometry (SLBI), which are efficiently used in several interferometriy techniques as an information carrier of the macroscopic wave front distortion induced by the surface displacement field of the object under investigation [4,5,6]. Some of these methods have limitations such as scale and segmentation and they deliver data that are abundant but partial. Using three wavelengths with three different lighting directions, we obtain a matrix relationship between the monochrome phase changes measured from the holograms and each component of the 3D displacement field
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