Fatigue crack growth resistance of niti shape memory alloy – smart 2019

J. Yaacoub, H. Sehitoglu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper discusses new findings on fatigue crack growth in an NiTi shape memory alloy. Despite the importance of the topic, there are very few papers that systematically studied fatigue crack growth with investigation of measurements of effective stress intensity at crack tips. It has become clear that one must account for the crack tip wake closure forces in modeling of crack tip stress intensity as they could produce net forces that are substantial. The tractions in the crack wake can reduce the driving forces but the calculation is rather complicated. Instead, we present stress intensity determination based on experimental displacement measurements at crack tips. We utilize digital image correlation to establish vertical and horizontal displacements in NiTi. We then compare the stress intensity determination based on regression of displacement results, which is termed the effective stress intensity range, with that of the stress intensity range based on LEFM. We find that the effective stress intensity range is lower than that based on classical LEFM solution, the difference being more significant at longer crack lengths.

Original languageEnglish (US)
Title of host publication9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019
EditorsAyech Benjeddou, Nazih Mechbal, Jean-Francois Deu
PublisherInternational Center for Numerical Methods in Engineering
Pages837-843
Number of pages7
ISBN (Electronic)9788494919466
StatePublished - 2019
Event9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019 - Paris, France
Duration: Jul 8 2019Jul 11 2019

Publication series

Name9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019

Conference

Conference9th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2019
Country/TerritoryFrance
CityParis
Period7/8/197/11/19

Keywords

  • Fatigue Crack Growth
  • NiTi
  • Shape Memory Alloys
  • Stress Induced Martensite
  • Stress Intensity

ASJC Scopus subject areas

  • Materials Science(all)
  • Energy(all)
  • Pollution

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