Objective
a Many industries operate their processing plant at high temperatures. If the operating temperature exceeds 0.4Tm then the phenomenon of creep becomes a significant restriction on the longevity, safety and reliability of the equipment. Welds in pipes (particularly stainless steel) which suffer embrittlement around the heat-affected zone are very susceptible to creep failure. The present method of dealing with this is to shut down the plant and carry out physical inspection (e.g. using radiography) and repair (e.g. using welding). This is very costly and is also not able to give an assurance that cracks are always detected. There is thus a demonstrable need for on-stream non-destructive testing and, since the equipment operates at high temperatures, this must also be remotely operated because access would be limited. In recent years, development of laser systems has reached the stage at which it will be possible to use the energy of a laser to excite a metallic structure. The amplitude or the vibration can be measured and analysed by a delayed second beam split from the original exciting laser. Since an uncracked metal structure such as a pipe will have a characteristic resonant vibration, this can form the reference signal. As metals suffer creep cracking at elevated temperatures. the resonant frequency will vary. This will therefore permit continuous on-stream monitoring of the crack propagation remotely; with the first laser being the 'hammer' and the split second laser being the 'ears'. The project therefore proposes to develop a laser-based system and associated signal analysis, mathematical and optical techniques in order to detect remotely the extent of creep crack propagation in metallic components operating at high temperatures.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Programme(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Coordinator
SO41 8GN LYMINGTON
United Kingdom
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