FATIGUE STRENGTH INVESTIGATION OF FOUR TYPE CAST IRONS SPECIMENS

  • M. K. Leonavičius Vilnius Gediminas Technical University
  • E. Stupak Vilnius Gediminas Technical University
  • A. Krenevičius Vilnius Gediminas Technical University
  • A. Norkus Vilnius Gediminas Technical University
Keywords: austempered ductile cast iron, durability

Abstract

In this paper data about four types cast irons chemical composition, microstructure, static mechanical properties, durability and cyclic fracture toughness is given. Ultimate stress obtained using cylindrical specimens of diameters 8-14 mm with circular notch are
σu = 403-692 MPa. Endurance limit values of notched specimens are σ0 = 85-96 MPa.

The performed analysis of breaks shows that heterogeneities and defects (voids) formation have an influence on static and cyclic fracture, because they change the crack front and shape of final fracture’s zone. The values of cyclic fracture toughness obtained according to the shape of final fracture’s zone are Kc = 10-26 MPa. The obtained data allows deciding about the suitability of cast irons for structural elements production.

DOI: http://dx.doi.org/10.5755/j01.mech.18.3.1882

Published
2012-06-14
Section
MECHANICS OF SOLID BODIES