Shot
Peening Success Stories for Transportation Applications
Shot
peening has proved its effectiveness in extending the
service life and enhancing the performance of metal
components by protecting them against fatigue, fretting
fatigue, stress corrosion cracking and a variety of
other failure mechanisms. Following are some of these
success stories for transportation applications:
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Train Emergency Brake Pin
A
brake pin is part of a hydraulic brake assembly used
in a mass transit train system. The undercut sections
near the chamfered end were designed to fail in the
event of axial overload. During the investigation of
premature failures it was found that a bending load
also was occurring. The combined axial and bending load
when simulated in test caused fatigue failure between
150,000 - 2,600,000 cycles. After shot peening was added
to the brake pin all test specimens exceeded 6,000,000
cycles without failure.
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