FRETTING FATIGUE IN MECHANICAL
JOINTS:
Critical Experiments And Numerical Analyses
Author(s)
G. Segerfrojd, G.-S. Wang and A.F. Blom
Abstract
FRETTING FATIGUE IN MECHANICAL
JOINTS:
Critical Experiments and Numerical Analyses
G. Segerfrqjd*t, G.-S. Wang* and A.F. Blom*t
* The Aeronautical Research Institute of Sweden, P.O. Box 11021,
SE-161 11 Bromma, email sdg@ffa.se, wgs@ffa.se and
abm@ffa.se.
f The Royal Institute of Technology, Department of Aeronautics,
SE-100 44 Stockholm, Sweden
ABSTRACT
Two different fatigue initiation mechanisms have been observed in 1 1/2-dogbone joints. Some
cracks initiated at the edge of the fastener hole at the location of the maximum stress
concentration, as would normally be expected. However, fatigue cracks frequently initiated
several mm:s away from the edge of the fastener hole. This anomalous behavior is due to
fretting and is particularly prevalent in joints assemled with certain fastener systems. This
paper summarizes a part of a larger experimental programme and shows which design
parameters, e.g. secondary bending, fastener stiffness, etc., control the two differ
Keywords
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