Development of Design and Analysis Guidelines for Brazed Joints in Ni-based Superalloys


Brazing is a unique process capable of joining materials with minimal damage to the base material properties, but the mechanical behavior of the brazed joint microstructure is still not fully understood.  Ni-base superalloy brazed joints are used for the manufacture and repair of high temperature gas turbine engines.  However, there are no standard test methods that compensate for the stress concentrations, high tri-axial stress, and potential defects that can reduce the strength of a brazed joint.  This study includes the development of the damage zone method utilized in FEA modeling as a set of failure criterion to predict brazed joint strength.  Modeling and design guidelines developed in this study can be implemented to improve the reliability and service performance of brazed joints, and to reduce the time and cost of the design process.


Industry Sponsor: Rolls Royce

Faculty: Boian Alexandrov, Avi Benatar (OSU)

Graduate Student: Vince DeCenso

Industry Contact: Ray Xu