Abstract
A low velocity impact response study has been carried out on glass fibre composite laminates, made up of regular aircraft grade epoxy (GFRP) and shape memory polymer (GF-SMP). Under various impact loading intensities (4J, 6J, 12J), the responses are measured by a network of PZT (Lead Zirconate Titanate) sensors. A signal analysis methodology is subsequently developed to process the very high frequency (60 MHz) sampled data. In two frequency bands, namely 0 - 2000 Hz and 0 - 100 KHz, the results are examined and the transient dynamic behaviours of the composite laminates are evaluated. It is observed that both the laminates have generated the high frequency structural waves (0 - 100 KHz), which can be exploited to examine the BVID. However, GF-SMP laminate has shown some advantage in terms of energy dissipation in the structural frequency band (<2000 Hz). Further, the GF-SMP laminate has demonstrated its capability to generate very high frequency structural waves, which could carry the damage information like BVID due to impact event to nearby sensors for impact event monitoring and health assessment.
Highlights
Fibre Reinforced Composite Structures may undergo various service loads during the operational time of the aircraft, space and automotive vehicles
The PSD plots are presented in two frequency bands, namely 20 to 2000 Hz to show the structural frequencies and 10 to 100 KHz, to display the generated lamb waves by impact events
As it is explained earlier that the main objective of this research study is to understand the transient response of green composite, made up of shape memory polymer
Summary
Fibre Reinforced Composite Structures may undergo various service loads during the operational time of the aircraft, space and automotive vehicles. It is mandatory to qualify these aircraft structures for impact loads, according to the Federal Aviation Regulations (FAR). It really demands the application of both numerical and experimental methods to be applied during the design phase of the structures, to ensure the safety margin. Conventional Non-destructive methods (C-Scan, Acoustic Emission, Thermography, Eddy Current Probe, Vibration Analysis etc.) are being used by aerospace industries to qualify the manufactured components, as well as they are deployed in periodical inspection for maintenance
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