Areal fatigue strength assessment of cast aluminium surface layers

Sebastian Pomberger, Michael Stoschka, Roman Aigner, Martin Leitner, Robert Ehart

Research output: Contribution to journalArticle

Abstract

The fatigue strength of cast aluminium surface layers is significantly affected by casting imperfections. Experimental work reveals crack initiation due to three failure modes; microporosity, cast surface texture as well as a combination of both. A novel local sub-area evaluation of notch factors for surface texture characterisation utilises areal surface texture by pit depth values Svlocal, ranging within several hundred microns, and related notch root radii ρ‾ distributions. Additionally, the cast bulk strength is calculated by Murakami's approach. For all three failure cases, the presented holistic fatigue layer strength assessment methodology is well applicable for sand cast aluminium.
Original languageEnglish
Article number105423
Number of pages11
JournalInternational Journal of Fatigue
Volume133
Issue numberApril
DOIs
Publication statusPublished - 2020
Externally publishedYes

Keywords

  • Areal roughness parameter
  • Cast aluminium surface layer
  • Fatigue strength
  • Porosity
  • Sub-area analysis

ASJC Scopus subject areas

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

Cite this