New ultrasonic methods for detecting damage in metals and composite materials

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New ultrasonic methods for detecting damage in metals and composite materials

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dc.contributor.author Armitage, Peter R. en_US
dc.date.accessioned 2012-09-24T09:37:40Z en_US
dc.date.accessioned 2013-03-21T10:01:30Z
dc.date.issued 2009-03-02 en_US
dc.description.abstract Recent requirements in the field of non-destructive testing are techniques that quantify micro-structural damage in a wide variety of materials during their manufacture and life cycle for ensuring both their quality and durability. Traditional evaluation techniques such as acoustic pulse echo, impact echo, resonance, ultrasonic transmission, electromagnetic and visual inspection methods are not sufficiently sensitive to the presence and development of domains of incipient and progressive damage. The research presented in this thesis details work undertaken by the author while working at the University of Exeter and is concerned with the development and validation of innovative methods to inspect micro-damage. Various non-linear acoustic measurement techniques, such as detecting defects by measuring the generation of harmonic and inter-modulation products, pulse inversion and resonant frequency deviation has been investigated. In addition to the experimental work new transducers and instrumentation has been developed and used in experimental validation tests on a variety of objects and differing materials. It has been found that the non-linear acoustic testing method provides a practical means by which low levels of progressive damage can be detected and quantified with sensitivities far in excess of that provide by conventional ultrasonic testing methods. en_GB
dc.identifier.uri http://hdl.handle.net/10036/3753 en_US
dc.language.iso en en_GB
dc.publisher University of Exeter en_GB
dc.title New ultrasonic methods for detecting damage in metals and composite materials en_GB
dc.type Thesis or dissertation en_GB
dc.date.available 2012-09-24T09:37:40Z en_US
dc.date.available 2013-03-21T10:01:30Z
dc.contributor.advisor Wright, C. David en_US
dc.publisher.department Engineering en_GB
dc.type.degreetitle PhD in Engineering en_GB
dc.type.qualificationlevel Doctoral en_GB
dc.type.qualificationname PhD en_GB


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