Shot
Peening Success Stories for Automotive 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 automotive applications:
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Diesel
Engine Crankshafts
Four-point-bending fatigue tests were carried out on test pieces from a diesel engine crankshaft. The material was Armco 17-10 Ph stainless steel. The required service of this crankshaft had to exceed one hundred million cycles. Fatigue strength of unpeened and shot peened test pieces were measured at one billion cycles. The fatigue strength for the unpeened material was 43 ksi (293 MPa) versus 56 ksi (386 MPa) for the peened material. This is an increase of ~ 30%.
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High Performance Crankshafts
Crankshafts
for 4-cylinder high performance engines were failing
prematurely after a few hours running on test at peak
engine loads. Testing proved that gas carburizing and
shot peening the crankpins gave the best fatigue performance.
Results from nitriding and shot peening also demonstrated
favorable results over the alternative to increase the
crankpin diameter.
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Automotive
Torsion Bars
The
automotive industry has used hollow torsion bars as
a means of weight savings. Shot peening was performed
on the outer diameter where the highest load stresses
occur. On heavy duty applications (four wheel drive
utility trucks, sport utility vehicles, etc.) cracks
can also occur on the inner diameter (ID), which also
experiences torsional loads.
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