In this work, the evaluation of damaged areas due to low velocity impact tests at different impact energy values and different temperatures on Glass Fiber (GF) laminates, made by infusion technology and reinforced with vinyl ester resin, was investigated by interferometric NDE (Non-destructive Evaluation) technique, Electronic Speckle Pattern Interferometry (ESPI). Composites are characterized by several interacting failure modes such as matrix breakage, fiber failure and delaminations, which can be simultaneously induced by low velocity impacts and can be different depending on temperature. It can be very difficult to detect by visual inspections of the structures such phenomena. The aim of this study is to evaluate the damaged area, due to the impact, in different conditions. GF composite laminates were impact damaged with three energy levels (5, 10, 20J) and at different temperatures (room temperature, -25°C, -50°C) by drop weight impact machine. The results showed that ESPI technique was able to identify barely visible low-velocity impact damages and that the damaged area increases at lower temperature
Impact damage investigation on glass fiber laminates at different temperatures by means of electronic speckle pattern interferometry
2019-06-01
1752715 byte
Conference paper
Electronic Resource
English
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