Determination of the rotary fatigue life of NiTi alloy wires.

Carvalho, A., Montalvão, D., Freitas, M., Reis, L. and Fonte, M., 2016. Determination of the rotary fatigue life of NiTi alloy wires. Theoretical and Applied Fracture Mechanics, 85 (Part A October), pp. 37-44.

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DOI: 10.1016/j.tafmec.2016.08.010

Abstract

Nickel-Titanium (NiTi) alloys with superelastic properties have been increasingly introduced as a substitute to more conventional alloys, such as stainless steel, in a variety of applications. In Dentistry, NiTi alloys are used in tools such as Endodontic rotary files, allowing the file to follow teeth root canals more easily than their stainless steel counterparts. Nevertheless, during surgery, the file is subjected to cyclic bending loading, since it is rotating while being deformed inside the curved canals and is prone to fracture due to fatigue, without showing any visible signals of degradation. Following a systematic approach, this work presents the results of rotary fatigue tests for several NiTi wires from different manufacturers (Memry and Euroflex). The formulation is presented, where the material strength reduction can be quantified from the determination of the strain and the number of cycles until failure. Experimental tests as well as numerical Finite Element Analysis (FEA) simulations are presented to better understand the fatigue fracture mechanisms present in NiTi alloys, showing that there is good agreement between the predicted strains (difficult to measure in such small wires) and the cycles to failure.

Item Type:Article
ISSN:1872-7638
Additional Information:XV Portuguese Conference on Fracture and Fatigue
Uncontrolled Keywords:Fatigue; Files; NiTi wires; Life evaluation
Subjects:UNSPECIFIED
Group:Faculty of Science & Technology
ID Code:24835
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:12 Oct 2016 09:40
Last Modified:22 Nov 2016 12:03

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