Bernard, S and Balla, Vamsi Krishna and Bose, S and Bandyopadhyay, A (2012) Compression fatigue behavior of laser processed porous NiTi alloy. Journal of the Mechanical Behavior of Biomedical Materials, 13. pp. 62-68. ISSN 1751-6161

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Porous metals are being widely used in load bearing implant applications with an aim to increase osseointegration and also to reduce stress shielding. However, fatigue performance of porous metals is extremely important to ensure long-term implant stability, because porous metals are sensitive to crack propagation even at low stresses especially under cyclic loading conditions. Herein we report high-cycle compression-compression fatigue behavior of laser processed NiTi alloy with varying porosities between ~1 and 20. The results show that compression fatigue of porous NiTi alloy samples is in part similar to metal foams. The applied stress amplitude is found to have strong influence on the accumulated strain and cyclic stability. The critical stress amplitudes associated with rapid strain accumulation in porous NiTi alloy samples, with varying relative densities, were found to correspond to 140 of respective 0.2 proof strength indicating that these samples can sustain cyclic compression fatigue stresses up to 1.4 times their yield strength without failure. © 2012.

Item Type: Article
Uncontrolled Keywords: Accumulated strain; Applied stress; Critical stress; Cyclic compression; Cyclic loading conditions; Cyclic stability; Fatigue behavior; Fatigue performance; Fatigue stress; Implant stability; Laser process; Load bearing; Low stress; Metal foams; NiTi alloys; Osseointegration; Porous; Porous metal; Porous NiTi alloy; Relative density; Strain accumulations; Stress shielding, Alloys; Fatigue of materials; Foams; Mechanical properties; Metals, Cerium alloys, alloy; metal; nickel; titanium, article; compression; fatigue; implant; laser; laser processing; loading test; materials; mechanical stress; metal implantation; neodymium YAG laser; particle size; powder; priority journal
Subjects: Engineering Materials
Divisions: Bioceramics & Coating
Depositing User: Bidhan Chaudhuri
Date Deposited: 07 Feb 2013 13:18
Last Modified: 13 Mar 2016 16:21

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