SYMPOSIA PAPER Published: 01 January 2011
STP49303S

Fatigue Assessment of Brazed T-Joints Based on Damage Tolerance Including Residual Stress Effects

Source

The fatigue crack growth behavior of a brazed joint is characterized by a Paris-exponent that is much higher than the one of bulk metals, which means that brazed components have only a short residual fatigue life after the initiation of a fatigue crack. Therefore, the threshold of fatigue crack growth of brazed joints is of particular importance in the fatigue analysis of brazed components and needs to be understood well. Residual stresses have to be considered in crack growth analysis in the threshold regime. The corresponding effects are explored experimentally and theoretically. The stress intensity factors due to the residual stresses in a brazed T-joint of compressor impellers were measured by using the cut compliance method. It was found that residual stresses are present but relatively small. They do not affect the endurance stress significantly. A concept for an endurance analysis of a brazed T-joint that includes imperfections and residual stresses is suggested.

Author Information

Schindler, Hans-Jakob
Mat-Tec AG, Winterthur, Switzerland
Leinenbach, Christian
EMPA—Swiss Federal Laboratories for Materials Testing and Research, Dübendorf, Switzerland
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 504–519
DOI: 10.1520/STP49303S
ISBN-EB: 978-0-8031-8678-1
ISBN-13: 978-0-8031-7512-9