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Residual Stress Effects in Fatigue: Friend or Foe?


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Tony Parker, Defence Academy of the United Kingdon, Cranfield University, England served as a nuclear strike navigator in the Royal Air Force before pursuing a Ph.D. on fracture and fatigue of aircraft structures. He was then appointed to the Defence of Academy of the UK where he taught and undertook research on fatigue and fracture of ‘big gun’.
During 1980/81 he was seconded as British Special Projects Officer to the US Army Materials & Mechanics Research Center, Boston, under a NATO cooperation program. He then worked for 11 years in the UK Polytechnic and University system as a Dean of Computing, Engineering and Science. He has spent the last 20 years as a consultant to the US Army at their Large Caliber Weapons Systems Laboratory, Benet Labs, NY and as a visiting Professor at the Defence Academy of the UK.   

From the US Liberty Ships that supplied Britain during World War II to major airliner disasters, large caliber guns and hypersonic wind tunnels, residual stresses have both created catastrophes and improved safety. Taming and using residual stress effects is now a necessity. Tony will outline the background, focusing upon the development of pressure vessel design between the 1960s and today.
The large caliber gun routinely operates closer to its fatigue limits than any other device. Tony will describe how beneficial residual stresses are created within gun barrels and civil pressure vessels via ‘autofrettage’. These permit order-of-magnitude improvements in lifetime whilst achieving ‘fail-safe’ behavior. This has required close collaboration between materials scientists and engineers over several decades.Finally the remaining ‘known-unknown’ (accurate modelling of swage autofrettage) will be addressed.

Thursday, Oct. 19, 2017 4:00 pm – 5:00 pm Crothers Engineering Hall , 249

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