- KOWARI - Residual-Stress Diffractometer
Strain scanning using
thermal neutrons is a powder diffractiontechnique in a polycrystalline block of material probing the change of atomic spacing due to internal or external stress.
It provides a diagnostic non-destructive tool to optimize e.g. post-weld heat treatment (PWHT, similar to
tempering) of welded structures. Tensile stresses for example drive crack growth in engineering components and compressive stresses inhibit crack growth (for example cold-expanded holes subject to fatigue cycling). Life extension strategies have high economic impact and strain scanning provides the stresses needed to calculate remaining life as well as the means to monitor the condition of components since it is non-destructive.
One of the main features is the sample table that will allow to examine large engineering components while orienting and positioning them very accurately. KOWARI is part of the
Bragg Institute's park of neutron scatteringinstruments.
It got its name from the Australian marsupial
* [http://www.ansto.gov.au/ansto/bragg/2005/res_stress/instrument_res.html KOWARI home page] dead link|date=January 2008 |url=http://www.ansto.gov.au/ansto/bragg/2005/res_stress/instrument_res.html
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