Premium
Standing contact fatigue
Author(s) -
Alfredsson B.,
Olsson M.
Publication year - 1999
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.1999.00154.x
Subject(s) - spall , materials science , gradation , composite material , lubrication , contact mechanics , surface (topology) , plane (geometry) , structural engineering , finite element method , geometry , engineering , mathematics , computer science , computer vision
A novel experimental method for testing the resistance of a material to contact fatigue, called standing contact fatigue (SCF), is presented. It comprises a spherical indenter, repeatedly pressed onto a plane specimen in pure normal contact without lubrication, friction or wear. The SCF method is here applied to three case‐hardened steels, and results in ring/cone cracks initiated at the surface. The connection between SCF and spalling is discussed. The experimental results are presented in the form of P – N curves, where P is the normal contact load and N the number of cycles required for fatigue crack initiation. The experimental results are supported by numerical simulations of the tests. The elasto‐plastic properties of case‐hardened materials are graded, i.e. functions of the depth from the carburized surface. The gradation is estimated from independent experiments and is included in the analysis.