Measurement of residual stresses in the turbine housings of turbochargers

Emission regulations in Europe are extremely stringent and only turbocharged and charged-air-cooled engines are able to
comply with current requirements. To meet these performance, durability and legislative conditions, a turbine housing must
be capable of operating in harsh environments where vibration is always present and exhaust temperatures can reach
800°C, however many turbine housings are at the limits of operation with regard to strength and durability under these
conditions, and failures are recorded on accelerated durability tests. It is now of great importance to understand the fatigue
performance of these components and the conditions that determine this performance. In this experiment residual stress
measurements will be made of three turbine housings in areas where cracks are commonly observed. We estimate that 4
days of beam time will be required.