The vibration bending fatigue life uncertainty of additively manufactured titanium (Ti) 6Al-4V specimens is studied. In this investigation, an analysis of microscopic discrepancies between ten fatigued specimens paired by stress amplitude is correlated with the bending fatigue life scatter. Through scanning electron microscope (SEM) analysis of fracture surfaces and grain structures, anomalies and distinctions such as voids and grain geometries are identified in each specimen. These data along with previously published results are used to support assessments regarding bending fatigue uncertainty. The understanding gained from this study is important for the future development of a predictive vibration bending fatigue life model.
Investigating Discrepancies in Vibration Bending Fatigue Behavior of Additively Manufactured Titanium 6Al-4V
Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received July 13, 2018; final manuscript received February 12, 2019; published online March 12, 2019. Assoc. Editor: Anastasia Muliana. The work was authored in part by a U.S. Government employee in the scope of his/her employment. ASME disclaims all interest in the U.S. Government’s contribution.
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Scott-Emuakpor, O., Holycross, C., George, T., Sheridan, L., Carper, E., and Beck, J. (March 12, 2019). "Investigating Discrepancies in Vibration Bending Fatigue Behavior of Additively Manufactured Titanium 6Al-4V." ASME. J. Eng. Mater. Technol. October 2019; 141(4): 041002. https://doi.org/10.1115/1.4042955
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