Fatigue repair of metallic structures with a thermally-activated shape memory alloy (SMA)/ Carbon fiber reinforced polymer (CFRP) patch

B. Zheng, M. Dawood

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

This paper introduces an approach of applying prestress/compressive stress to fatigue sensitive details of steel members using shape memory alloys (SMA) and carbon fiber reinforced polymer (CFRP) composites. The effectiveness of this approach in improving the fatigue behavior of steel members is also demonstrated. A total of 27 single edge-notched steel specimens were repaired using one of four different reinforcement configurations. The repaired specimens were tested under tension-tension fatigue loading at three different stress ranges up to failure. Test results showed that the average fatigue life of specimens that were reinforced with SMA/CFRP patches was 26 times that of the un-reinforced specimens at a stress range of 155 MPa. At an applied stress range of 217 MPa the average fatigue life of the retrofitted specimens was 15 times that of the un-reinforced specimens. The results indicate that the use of SMA/CFRP composites is a promising approach to extend the lives of metallic structures that are susceptible to fatigue-induced cracking.

Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
EditorsJ.G. Dai, J.G. Teng
PublisherDepartment of Civil and Environmental Engineering and Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University
Pages1099-1104
Number of pages6
ISBN (Electronic)9789881448026
Publication statusPublished - 2016
Externally publishedYes
Event8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016 - Hong Kong, China
Duration: 14 Dec 201616 Dec 2016

Publication series

NameProceedings of the 8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016

Conference

Conference8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016
Country/TerritoryChina
CityHong Kong
Period14/12/1616/12/16

Keywords

  • CFRP
  • Fatigue
  • Repair of steel structures
  • Shape memory alloys

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Polymers and Plastics

Cite this