Abstract
Mechanical surface treatments locally deform a metal substrate, introducing high compressive stresses at their surface. This has been shown to positively influence the fatigue endurance strength of cyclically loaded parts, e.g. in the aerospace industry. Hour-glass shaped specimens made of an orthopedic standard titanium alloy (Ti6Al4V) were shot peened and subjected to a simusoidal bending load condition up to a total of 107 cycles or until fracture occurred. Residual stress profiles were determined with high compressive stresses of over 800MPa and a maximum penetration depth of 130μm. Surface roughness was increased by 840% compared to the untreated condition. In conclusion, shot peening shows the potential to increase fatigue strength by 12.3% and represents a great option for Ti6Al4V parts that are susceptible to high stresses, e.g. modular total joint replacements or implants for trauma surgery.
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