A Numerical Approach for Crack Detection in Fiber Reinforced Composites

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Student thesis: Master's Thesis

Abstract

The main objective of this Master’s Thesis was to develop a 2D numerical Non-Destructive testing (NDT) method for crack detection in unidirectional fiber-reinforced laminas thanks to the finite element code ANSYS In that respect a numerical approach based on the traveling time of reflected elastic waves on interfaces has been formulated thanks to the identification of specific peaks in strain response signals The impulse loads used are characteristic of an ultrasonic testing approach at a frequency of 0 5 MHz The approach was proven to be effective and accurate for the detection of through thickness cracks and the retrieval of their positions lengths and orientations for several composite properties and multiple fibers orientations The chosen inspection configuration and the model boundary conditions were typical of those encountered in real inspections situations such as the inspection of a composite wing in the vicinity of its root Finally an assessment of the material properties effect on the wave propagation has been done which led to further suggestions regarding detection accuracy
Date of Award2018 Jul 26
Original languageEnglish
SupervisorChyanbin Hwu (Supervisor)

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