A study of the effect of thermal cycling on residual stress in the turbine housing component of the turbocharger.
To meet European performance, durability and legislative conditions, a turbine housing must be capable of operating in harsh environments, in which they are subjected to thermal cycling up to 800°C. Many turbine housings are at the limits of operation with regard to strength and durability under these conditions, and failures have been recorded on accelerated durability tests. It is therefore of great importance to understand the fatigue performance of these components and the conditions that determine this fatigue. The proposed experiment is a continuation of preliminary work on SALSA in 2013 (proposal 1-02-141), which looked at the effect of heat treatment on residual stress relaxation. This experiment will now explore the effect of thermal cycling on residual stress stability, by obtaining measurements in fatigue crack initiation sites both before and after thermal cycling. It is hoped that this combined with additional work using high temperature strain gauges to measure surface strains induced during thermal cycling, will provide a complete picture of how residual and applied stresses change throughout the life of the housing, and allow the validation of simulation models.
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KILCOYNE Susan; GANNON Katy; KIUMARS Shoghi and PIRLING Thilo. (2016). A study of the effect of thermal cycling on residual stress in the turbine housing component of the turbocharger.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-194
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