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• W2183744384 abstract "The aim of the work in this thesis was to develop an NDT technique capable of measuring velocity changes caused by an applied stress. A dual frequency mixing technique was used to perform the experiments, in which the interaction between two surface acoustic waves (SAWs) was observed. The pump SAW, generated by a transducer, stressed the sample surface. The probe SAW was generated by an Optical Scanning Acoustic Microscope (OSAM), capable of generating ultrasound at 82MHz and its harmonics. The level of stress experienced by the probe SAW was adjusted by controlling the pump-probe interaction-point using a system of timing electronics. The nonlinear interaction was directly measured as a phase modulation of the probe SAW and equated to a velocity change. Detection of both SAWs was achieved using a knife-edge detector. The stresses exerted by the transducer were typically <10MPa and the velocity-stress relationship provided a measure of material nonlinearity. The technique described herein was sensitive to changes in temperature and, therefore, several temperature suppression techniques were developed to improve acquisition of results. CHeap Optical Transducers (CHOTs) were integrated into the experiment and the measurements obtained using these devices were similar to those acquired using the knife-edge detector. Velocity changes of 115.2mms/MPa, −34.4mms/MPa and−31.9mms/MPa were measured on fused silica, Al-2024 and Al-6061, respectively. Experiments showed that fused silica and aluminium had opposite nonlinear responses, consistent with previous published data. The work in this thesis could be applied to fatigue measurements, for example in the aeronautics industry, to safely and reliably extend the useable life of aircraft engine components. Acknowledgements I would first of all like to thank my supervisor Dr M Clark for all of his guidance, support and suggestions throughout this research. Thanks go to Professor M Somekh for his advice and assistance and also to Dr S Sharples who has always been willing to advise. I also express my gratitude to Teti Stratoudaki for our endless, yet enjoyable, discussions and for her encouragement. Thanks go to Jose Hernandez and to my other colleagues: Richard Smith, Robert Ellwood and Wen-qi Li. My appreciation also goes to the technicians at Nottingham University for allowing me to use their facilities and to Brian Webster for providing his expertise on sample preparation and allowing me to perform experiments on the fatiguing machines in the Mechanical Engineering Department. In addition, I thank Katy Milne and the technicians at Rolls-Royce for their help with fatiguing samples. My gratitude must also extend to my family and friends for their continued support and encouragement." @default.
• W2183744384 created "2016-06-24" @default.
• W2183744384 creator A5029100763 @default.
• W2183744384 date "2008-01-01" @default.
• W2183744384 modified "2023-09-24" @default.
• W2183744384 title "Measurement of Material Nonlinearity using Laser Ultrasound" @default.
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