Layout of Highly Stressed Injection and Motor Components
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Hydraulic autofrettage as a means of increasing fatigue life of components charged with internal high-pressure (for example common rails for Diesel-injection systems) is establishing itself progressively in the field of off-highway engines. During computational layout of this process step, consideration of anisotropic material behaviour is of primary importance. So far, local quite possibly directional component-strength (such as due to prior autofrettage) has not been taken into account among standards to evaluation of durability for forged components. In the context of a joint development project this gap has been closed by Hirschvogel Automotive Group, Engineering Center Steyr and Transvalor.
Principle of Hydraulic Autofrettage
KeywordsResidual Stress Fatigue Life Ultimate Tensile Strength Compressive Residual Stress Common Rail
The authors would like to thank Dipl.-Ing. Axel Werkhausen, FEMFAT-Sales- and Support-Manager, and Dr.-Ing. Christian Gaier, Team-Manager of the FFEMFAT Development Department, both at Engineering Center Steyr GmbH & Co. KG in St. Valentin (Austria), as well as Dipl.-Ing. Olivier Krafft, Sales Engineer Northern Europe at Transvalor S.A. in Mougins Cedex (France) and Dipl.-Ing. Angela Kotte, Development Engineer for Material & Technology in the Advanced Engineering Department at Hirschvogel Automotive Group in Denklingen (Germany), for their contribution during the implementation of the development project.
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