Influence of Defects on High Cycle Fatigue Response of Ti45Nb Biocompatible Alloy

Abstract:

The high cycle fatigue response of Ti-45Nb alloy was investigated by using an ultrasonic fatigue testing system. The effect of notch geometry on the fatigue response was studied on samples with different circumferential grooves. The experiments showed a decrease of fatigue notch sensitivity with decreasing the notch radius. Finite element analysis (FEA) was conducted for calculation of the stress distribution in the samples and interpretation of the experimental results. Further, the lifetime of the alloy showed a strong dependency on the location of the defects and microstructural inhomogeneities. It was observed that at the same stress amplitude, early failure was caused by surface defects, while those with a longer lifetime failed due to cracks originating from internal flaws.

• Periodical: Solid State Phenomena (Volume 258)
• Pages: 337-340
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.258.337
• Online since: December 2016
• Authors: Mitra Delshadmanesh, Golta Khatibi*, Martin Lederer, Michael Josef Zehetbauer, Herbert Danninger
• Keywords: Biomaterials, Defects, High Cycle Fatigue, Notch Sensitivity, Titanium Alloy

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