Characterization of crack propagation behavior in Al-7075 under in-plane biaxial fatigue loading with shear overloads

Abhay K. Singh, Siddhant Datta, Aditi Chattopadhyay, Nam Phan

Research output: Contribution to journalArticle

Abstract

Effect of shear overloads in an otherwise constant amplitude, tensile biaxial fatigue loading is investigated using a cruciform specimen of Al 7075-T651, and the crack propagation behavior and governing micromechanisms are characterized. It was observed that with an increase in shear overload ratio fatigue life of the specimen is increased and the crack growth rate is significantly affected. This behavior is attributed to the combined effects of competing mechanisms including compressive residual stress, plasticity induced crack closure, and strain hardening. The fractographic study revealed features of shear fracture in the transient region and tensile fracture in the pre-overload region and post-overload region.

Original languageEnglish (US)
Article number105529
JournalInternational Journal of Fatigue
Volume134
DOIs
StatePublished - May 2020
Externally publishedYes

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Keywords

  • Biaxial fatigue
  • Crack propagation
  • Crack retardation
  • Fractography
  • Shear overloads

ASJC Scopus subject areas

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

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