Manufacturing Industry
Getting the inside story on road bridge cracks. (News).
Engineer, The, May, 2002 by Philip Sen
THE HIGHWAYS AGENCY is examining the feasibility of a device that 'listens' for newly-formed cracks developing inside the steel of motorway and other road bridges.
Developed by Cardiff University engineers and Cambridge company Physical Acoustics, the device -- which could have a range of other uses, from Formula One racing to health care -- enables components to be checked without drilling into the bridge's structure, thus avoiding the need for scaffolding and lane closures.
In motorway bridges, due to the movements of vehicles, the steel structure is subject to constantly-changing stresses. Internal cracks advance by microscopic amounts, producing ultrasonic waves like miniature earthquakes. Dr Aled Davies of Cardiff University School of Engineering said...
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