Fatigue performance of surface ground and wire electrical discharge machined TiNi shape memory alloy

Robert J. Beck; David K. Aspinwall; Sein Leung Soo; Paul Williams; Roberto Perez

doi:10.1177/09544054211028844

Fatigue performance of surface ground and wire electrical discharge machined TiNi shape memory alloy

Robert J. Beck, David K. Aspinwall, Sein Leung Soo^*, Paul Williams, Roberto Perez

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Fatigue performance is a major consideration for critical aerospace components. The influence of surface grinding and rough/finish wire electrical discharge machining (WEDM) on the high cycle fatigue performance of a binary Ti_50.8-Ni_49.2 shape memory alloy was assessed. The effect of machined workpiece surface integrity in terms of surface roughness and subsurface microhardness on the fatigue results was also evaluated, in addition to fractography analysis. Testing was performed using a tensile-tensile regime at an elevated temperature of 150°C with specimens in the austenitic phase. Ground samples showed the highest fatigue strength of 390 MPa at run-out of 1.2 × 10⁷ cycles, while finish and rough WEDM specimens were 21% and 57% lower respectively, despite the finish WEDM surfaces having significantly lower roughness. This was likely due to the presence of tensile residual stresses following WEDM. All of the S-N curves however exhibited a relatively flat response with no clear indication of endurance limits. This implies that the different machining processes/conditions affected the fatigue strength of the material, but not the overall trend/shape of the fatigue curves.

Original language	English
Pages (from-to)	355-362
Number of pages	8
Journal	Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Volume	236
Issue number	4
Early online date	9 Jul 2021
DOIs	https://doi.org/10.1177/09544054211028844
Publication status	Published - 1 Mar 2022

Bibliographical note

Funding Information:
The authors wish to thank Rolls-Royce plc, GF Machining Solutions, Iscar and the University of Birmingham. The assistance of Drs. John F. Webster, Wayne Voice, Neil Glover and Tim Doel are also gratefully acknowledged. The author(s) received no financial support for the research, authorship, and/or publication of this article.

Publisher Copyright:
© IMechE 2021.

Keywords

Fatigue
microhardness
roughness
shape memory alloy
surface grinding
wire electrical discharge machining

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering

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BeckR2021FatigueFinal published version, 1.52 MBLicence: Creative Commons: Attribution-NonCommercial (CC BY-NC)

Cite this

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title = "Fatigue performance of surface ground and wire electrical discharge machined TiNi shape memory alloy",

abstract = "Fatigue performance is a major consideration for critical aerospace components. The influence of surface grinding and rough/finish wire electrical discharge machining (WEDM) on the high cycle fatigue performance of a binary Ti50.8-Ni49.2 shape memory alloy was assessed. The effect of machined workpiece surface integrity in terms of surface roughness and subsurface microhardness on the fatigue results was also evaluated, in addition to fractography analysis. Testing was performed using a tensile-tensile regime at an elevated temperature of 150°C with specimens in the austenitic phase. Ground samples showed the highest fatigue strength of 390 MPa at run-out of 1.2 × 107 cycles, while finish and rough WEDM specimens were 21% and 57% lower respectively, despite the finish WEDM surfaces having significantly lower roughness. This was likely due to the presence of tensile residual stresses following WEDM. All of the S-N curves however exhibited a relatively flat response with no clear indication of endurance limits. This implies that the different machining processes/conditions affected the fatigue strength of the material, but not the overall trend/shape of the fatigue curves.",

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author = "Beck, {Robert J.} and Aspinwall, {David K.} and Soo, {Sein Leung} and Paul Williams and Roberto Perez",

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Fatigue performance of surface ground and wire electrical discharge machined TiNi shape memory alloy. / Beck, Robert J.; Aspinwall, David K.; Soo, Sein Leung et al.
In: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Vol. 236, No. 4, 01.03.2022, p. 355-362.

Research output: Contribution to journal › Article › peer-review

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AU - Soo, Sein Leung

AU - Williams, Paul

AU - Perez, Roberto

N1 - Funding Information: The authors wish to thank Rolls-Royce plc, GF Machining Solutions, Iscar and the University of Birmingham. The assistance of Drs. John F. Webster, Wayne Voice, Neil Glover and Tim Doel are also gratefully acknowledged. The author(s) received no financial support for the research, authorship, and/or publication of this article. Publisher Copyright: © IMechE 2021.

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N2 - Fatigue performance is a major consideration for critical aerospace components. The influence of surface grinding and rough/finish wire electrical discharge machining (WEDM) on the high cycle fatigue performance of a binary Ti50.8-Ni49.2 shape memory alloy was assessed. The effect of machined workpiece surface integrity in terms of surface roughness and subsurface microhardness on the fatigue results was also evaluated, in addition to fractography analysis. Testing was performed using a tensile-tensile regime at an elevated temperature of 150°C with specimens in the austenitic phase. Ground samples showed the highest fatigue strength of 390 MPa at run-out of 1.2 × 107 cycles, while finish and rough WEDM specimens were 21% and 57% lower respectively, despite the finish WEDM surfaces having significantly lower roughness. This was likely due to the presence of tensile residual stresses following WEDM. All of the S-N curves however exhibited a relatively flat response with no clear indication of endurance limits. This implies that the different machining processes/conditions affected the fatigue strength of the material, but not the overall trend/shape of the fatigue curves.

AB - Fatigue performance is a major consideration for critical aerospace components. The influence of surface grinding and rough/finish wire electrical discharge machining (WEDM) on the high cycle fatigue performance of a binary Ti50.8-Ni49.2 shape memory alloy was assessed. The effect of machined workpiece surface integrity in terms of surface roughness and subsurface microhardness on the fatigue results was also evaluated, in addition to fractography analysis. Testing was performed using a tensile-tensile regime at an elevated temperature of 150°C with specimens in the austenitic phase. Ground samples showed the highest fatigue strength of 390 MPa at run-out of 1.2 × 107 cycles, while finish and rough WEDM specimens were 21% and 57% lower respectively, despite the finish WEDM surfaces having significantly lower roughness. This was likely due to the presence of tensile residual stresses following WEDM. All of the S-N curves however exhibited a relatively flat response with no clear indication of endurance limits. This implies that the different machining processes/conditions affected the fatigue strength of the material, but not the overall trend/shape of the fatigue curves.

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Fatigue performance of surface ground and wire electrical discharge machined TiNi shape memory alloy

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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