ON FATIGUE STRENGTH OF ANISOTROPIC MATERIALS

MECHANICS

  • H. G. Shekyan Institute of Mechanics, RA NAS
  • N. G. Hovumyan National University of Architecture and Construction of Armenia
Keywords: fatigue strength, endurance limit, stress, deformation, cycle, oscillation

Abstract

A study on the strength of materials in case of their cyclic loading within various ranges of alternating stresses is introduced. The graphical representation of relationship between the cycle average stress and the range of repeated or fluctuating stresses has been established. On the basis of a simplified limit stresses’ graph for any asymmetric cycle, a stress calculation formula is derived. Considering the deformation process as an elasto-plastic phenomenon, a Mathiе-Hill equation-type differential equation with variable constants has been obtained for a uniaxial oscillatory motion of a specimen. For a low frequency repeated cyclic load, an equation of a fatigue strength curve has been derived.

Published
2015-12-14
Issue
Vol 18 No 2 (2015): 2 (18) / 2015
Section
Articles