Abstract
In this paper, an instantaneously recorded baseline method is proposed using piezoelectric transducers for damage localization under varying temperature. This method eliminates need for baselines required when operating at different temperatures by mapping a baseline area onto the interrogation area. Instantaneously recorded baselines and current interrogation signals are calibrated based on the sensor mapping. This allows the extraction of damage scatter signal which is used to localize damage. The proposed method is used to localize actual impact damage on a composite plate under varying temperatures. The method is also applied to a stiffened fuselage panel to accurately localize impact damage.
Highlights
T HE susceptibility of composite materials to impact damage has forced a damage tolerant design approach in aircraft, driven by certification requirements [1]
An area of great concern is barely visible impact damage (BVID) which can lead to a drop in strength properties of Carbon fibre reinforced polymers (CFRPs)
Ultrasonic Guided wave active Structural health monitoring (SHM) systems are composed of a network of attached ultrasonic transducers, typically piezoelectric Lead Zirconate Titanate (PZT), to generate and sense diagnostics Lamb waves
Summary
T HE susceptibility of composite materials to impact damage has forced a damage tolerant design approach in aircraft, driven by certification requirements [1]. The underlying elegance of baseline comparison is that the highly convoluted Lamb wave response of the geometric features are removed leaving only the damage scattered signal [2], [3] This allows damage detection and localization on complex and anisotropic structures, with manufacturing tolerances. Scaled subtraction was applied to a composite panels to detect delaminations [17] These methods may not perform well on real structures with complex features, such as changes in thickness; stiffeners and bolts, can cause non-linear wave propagation. The problem of environmental conditions and temperature change is mitigated as baselines are recorded at the same time as the current signal This means temperature compensation is not required while accurate detection is achieved over a larger temperature range than [8]. The method is demonstrated experimentally by localizing actual impact induced BVID in a CFRP plate and BVID under a stiffener foot in a CFRP fuselage panel
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