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Author:

Huang, Haoyu (Huang, Haoyu.) | Zhu, Yuan-Zhi (Zhu, Yuan-Zhi.) | Chang, Wen-Shao (Chang, Wen-Shao.)

Indexed by:

EI Scopus SCIE

Abstract:

The behaviour under cyclic bending and in particular the fatigue properties of shape memory alloy (SMA) bars are important for civil engineering applications. In this paper, structural and functional fatigue is studied for both NiTi- and copper-based shape memory alloys. The results are presented from cyclic bending tests on 7 mm diameter NiTi and 12 mm diameter CuAlMn SMA bars targeted at 100,000 cycles. During the tests, dynamic loading at 1 Hz, 5 Hz, and 8 Hz was applied for different strain levels (0.5%, 1%, 2%, and 6%). The stress-strain curve, damping ratio, and secant stiffness were analysed for material characterisation, and the evolution of these parameters was studied to assess functional fatigue. The fatigue life is extended dramatically when the strain is below 1%, and the structural fatigue life of CuAlMn is shown to be better than that of NiTi and to depend on the loading rate. However, decay in stiffness can be found in the CuAlMn SMA, which is considered to be caused particularly by its long grain boundary.

Keyword:

Author Community:

  • [ 1 ] [Huang, Haoyu]Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing Key Lab Earthquake Engn & Struct Retrofit, Beijing 100124, Peoples R China
  • [ 2 ] [Zhu, Yuan-Zhi]North China Univ Technol, Sch Mech & Mat Engn, Beijing 100144, Peoples R China
  • [ 3 ] [Chang, Wen-Shao]Univ Sheffield, Sch Architecture, Sheffield S10 2TN, S Yorkshire, England

Reprint Author's Address:

  • [Chang, Wen-Shao]Univ Sheffield, Sch Architecture, Sheffield S10 2TN, S Yorkshire, England

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Source :

ADVANCES IN MATERIALS SCIENCE AND ENGINEERING

ISSN: 1687-8434

Year: 2020

Volume: 2020

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:169

Cited Count:

WoS CC Cited Count: 16

SCOPUS Cited Count: 17

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

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