Low Cost Shadow Moire Device for the Nondestructive Evaluation of Impact Damagein Composite Laminates

摘要

Studies conducted under this Independent Exploratory Development (IED) projecthave concentrated on developing a field inspection instrument for the detection of low-velocity impact damage and delaminations in laminated composites and honeycomb sandwich structures. A low cost, hand-held battery-powered damage detector has been developed which can be operated under field conditions. This device can be used to detect minute surface perturbations resulting from foreign object impact that can cause disbond and/or delamination in aircraft structures. Since the operation of the device is simple and its detecting capability is not affected by temperature, humidity or vibration, it can be used under field operational conditions with minimum training. The entire detector system, including the power pack, weighs less than 3.5 lbs. Keywords: Shadow moire, Impact damage, delaminations, Composite structures, Nondestructive testing, IED, Optics, Interferometry, Shadow moire out-of-plane interferometric (SMOOPI) damage detector. (JG)