Determination of the rotary fatigue life of NiTi alloy wires

Authors: Carvalho, A., Montalvão, D., Freitas, M., Reis, L. and Fonte, M.

Journal: Theoretical and Applied Fracture Mechanics

Volume: 85

Pages: 37-44

ISSN: 0167-8442

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.

https://eprints.bournemouth.ac.uk/24835/

Source: Scopus

Determination of the rotary fatigue life of NiTi alloy wires

Authors: Carvalho, A., Montalvao, D., Freitas, M., Reis, L. and Fonte, M.

Journal: THEORETICAL AND APPLIED FRACTURE MECHANICS

Volume: 85

Pages: 37-44

eISSN: 1872-7638

ISSN: 0167-8442

DOI: 10.1016/j.tafmec.2016.08.010

https://eprints.bournemouth.ac.uk/24835/

Source: Web of Science (Lite)

Determination of the rotary fatigue life of NiTi alloy wires

Authors: Carvalho, A., Montalvao, D., Freitas, M., Reis, L. and Fonte, M.

Journal: Theoretical and Applied Fracture Mechanics

Publisher: Elsevier

ISSN: 1872-7638

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.

https://eprints.bournemouth.ac.uk/24835/

Source: Manual

Determination of the rotary fatigue life of NiTi alloy wires

Authors: Carvalho, A., Montalvão, D., Freitas, M., Reis, L. and Fonte, M.

Journal: Theoretical and Applied Fracture Mechanics

Volume: 85

Issue: Part A October

Pages: 37-44

ISSN: 1872-7638

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.

https://eprints.bournemouth.ac.uk/24835/

Source: BURO EPrints