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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%.
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.
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.
CWST is able to shot peen the ID using its lance shot peening methods. This provides necessary compressive stress throughout the torsion/anti-sway bar length.
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