Effect of wire-EDM on fatigue of nitinol shape memory alloy

J. F. Liu, C. Li, X. Y. Fang, J. B. Jordon, Yuebin Guo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Electrical discharge machining (EDM) is advantageous in machining high strength and high-aspect-ratio components. However, EDM-induced thermal damage would detrimentally reduce fatigue life of critical components, such as biomedical Nitinol implants. As such, this paper focuses on the relationship between surface integrity and fatigue life of the wire-EDMed Nitinol samples. Surface integrity of Nitinol samples machined at main cut (MC) can be significantly improved by subsequent trim cuts. Nitinol samples at finish trim cut (TC) show lower surface roughness and thinner white layer than those at MC. The fatigue testing results show that the samples made by finish TC have 48% more fatigue life than those by MC. The examination of the fractography shows that fatigue cracks initiate from microvoids in the thick white layer. In addition, a thinner white layer or less tensile residual stress benefits fatigue performance, and would lead to longer fatigue life.

Original languageEnglish (US)
Pages (from-to)1809-1814
Number of pages6
JournalMaterials and Manufacturing Processes
Volume33
Issue number16
DOIs
StatePublished - Dec 10 2018

Fingerprint

Electric discharge machining
Shape memory effect
Fatigue of materials
Wire
Fractography
Fatigue testing
Tensile stress
Aspect ratio
Residual stresses
Machining
Surface roughness
nitinol

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Keywords

  • EDM
  • Surface
  • alloy
  • fatigue
  • integrity
  • memory
  • nitinol
  • shape

Cite this

Liu, J. F. ; Li, C. ; Fang, X. Y. ; Jordon, J. B. ; Guo, Yuebin. / Effect of wire-EDM on fatigue of nitinol shape memory alloy. In: Materials and Manufacturing Processes. 2018 ; Vol. 33, No. 16. pp. 1809-1814.
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Effect of wire-EDM on fatigue of nitinol shape memory alloy. / Liu, J. F.; Li, C.; Fang, X. Y.; Jordon, J. B.; Guo, Yuebin.

In: Materials and Manufacturing Processes, Vol. 33, No. 16, 10.12.2018, p. 1809-1814.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of wire-EDM on fatigue of nitinol shape memory alloy

AU - Liu, J. F.

AU - Li, C.

AU - Fang, X. Y.

AU - Jordon, J. B.

AU - Guo, Yuebin

PY - 2018/12/10

Y1 - 2018/12/10

N2 - Electrical discharge machining (EDM) is advantageous in machining high strength and high-aspect-ratio components. However, EDM-induced thermal damage would detrimentally reduce fatigue life of critical components, such as biomedical Nitinol implants. As such, this paper focuses on the relationship between surface integrity and fatigue life of the wire-EDMed Nitinol samples. Surface integrity of Nitinol samples machined at main cut (MC) can be significantly improved by subsequent trim cuts. Nitinol samples at finish trim cut (TC) show lower surface roughness and thinner white layer than those at MC. The fatigue testing results show that the samples made by finish TC have 48% more fatigue life than those by MC. The examination of the fractography shows that fatigue cracks initiate from microvoids in the thick white layer. In addition, a thinner white layer or less tensile residual stress benefits fatigue performance, and would lead to longer fatigue life.

AB - Electrical discharge machining (EDM) is advantageous in machining high strength and high-aspect-ratio components. However, EDM-induced thermal damage would detrimentally reduce fatigue life of critical components, such as biomedical Nitinol implants. As such, this paper focuses on the relationship between surface integrity and fatigue life of the wire-EDMed Nitinol samples. Surface integrity of Nitinol samples machined at main cut (MC) can be significantly improved by subsequent trim cuts. Nitinol samples at finish trim cut (TC) show lower surface roughness and thinner white layer than those at MC. The fatigue testing results show that the samples made by finish TC have 48% more fatigue life than those by MC. The examination of the fractography shows that fatigue cracks initiate from microvoids in the thick white layer. In addition, a thinner white layer or less tensile residual stress benefits fatigue performance, and would lead to longer fatigue life.

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KW - Surface

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KW - integrity

KW - memory

KW - nitinol

KW - shape

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