Thermal effects on fatigue crack growth and closure: Multiscale digital image correlation experiments

Mallory C. Casperson, John Lambros, Huseyin Sehitoglu

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

Abstract

Hastelloy X, a nickel-based superalloy, has been extensively used for high temperature applications. In this work, Hastelloy X notched samples were used to investigate fatigue crack growth and fatigue crack closure both at room and elevated temperatures. Digital Image Correlation (DIC) experiments at two different scales were performed: 2 µm/pixel, and 400 nm/pixel. Isothermal, thermal jump, and thermal overload experiments at varying temperatures, were performed and images were collected at various stages of crack growth. Competing mechanisms were investigated (including crack tip blunting and change in temperature, yield stress, elastic modulus, and plastic zone size) that are thought to be responsible for the changes in fatigue crack growth rates and closure levels following the thermal jumps and during the thermal overload. Isothermal conditions were shown to have no effect on crack closure, while thermal jumps and thermal overloads created significant changes in closure levels following the change in temperature.

Original languageEnglish (US)
Title of host publicationICF 2017 - 14th International Conference on Fracture
EditorsEmmanuel E. Gdoutos
PublisherInternational Conference on Fracture
Pages741-742
Number of pages2
ISBN (Electronic)9780000000002
StatePublished - Jan 1 2017
Event14th International Conference on Fracture, ICF 2017 - Rhodes, Greece
Duration: Jun 18 2017Jun 20 2017

Publication series

NameICF 2017 - 14th International Conference on Fracture
Volume1

Conference

Conference14th International Conference on Fracture, ICF 2017
Country/TerritoryGreece
CityRhodes
Period6/18/176/20/17

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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