University of Twente Student Theses


Rain erosion damage assessment using ultrasonics

Sharma, Y. (2020) Rain erosion damage assessment using ultrasonics.

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Abstract:In this report, the use of ultrasonics is investigated to monitor the condition of polymer coating, made of Acrylonitrile Butadiene Styrene (ABS), with increasing number of water drop impacts and to determine the three stages. It is necessary to conduct preliminary experiments on ABS specimen before performing rain erosion experiments. The preliminary experiments reveal the wave propagation behaviour in the ABS specimen, that is, the wave modes existing at different frequencies and sensitivity of the wave mode to the erosion. It was found that the anti-symmetric wave mode is more sensitive to erosion damage. The results from the preliminary experiments are used to develop methodologies and algorithms which can be used in rain erosion experiments. Using acousto-ultrasonics, damage indicators are obtained that indicate the initiation of micro-cracks, pitting during incubation period and the progression of erosion with respect to the number of water drops impacts. The end of incubation period or initiation of erosion for the ABS material is determined using acoustic emission. Moreover, the locations of impact and damage are also predicted through localisation algorithms.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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