A branch criterion for shallow angled rolling contact fatigue cracks in rails

A branch criterion for shallow angled rolling contact fatigue cracks in rails

A well-developed ‘squat’ grows at about 10° to the upper surface of the rail. It is observed that this shallow angled rolling contact fatigue crack may change its growth direction; either to branch downwards and grow at about 55° to the rail surface or to branch upwards. Various research workers hav...

Full description

Saved in:
Bibliographic Details
Published in:Wear Vol. 191; no. 1; pp. 45 - 53
Main Authors: Wong, S.L., Bold, P.E., Brown, M.W., Allen, R.J.
Format: Journal Article Conference Proceeding
Language:English
Published: Lausanne Elsevier B.V 1996
Amsterdam Elsevier Science
New York, NY
Subjects:
Applications
Applied sciences
Cracks
Engineering techniques in metallurgy. Applications. Other aspects
Exact sciences and technology
Fatigue
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Rails
Railway engineering
Rolling contact
Rails
Cracks
Rolling contact
Fatigue
Roll contact fatigue
Crack array
Tensile stress
Stress intensity factor
Rail
Rupture
Shear stress
Steel
Experimental study
Fatigue crack
Railway equipment
Crack propagation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A well-developed ‘squat’ grows at about 10° to the upper surface of the rail. It is observed that this shallow angled rolling contact fatigue crack may change its growth direction; either to branch downwards and grow at about 55° to the rail surface or to branch upwards. Various research workers have shown that the crack is subjected to a characteristic sequence of tensile and shear stresses. The downward branches are more detrimental to the integrity of rails because they can lead to fracture. Therefore it is necessary to identify the condition that transforms the stable shallow-angled crack to a branch. Experimental results on a cruciform specimen subject to the characteristic load sequence show that the crack growth direction is determined by the effective mode I stress intensity factor range and degree of overlap in mixed mode loading.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0043-1648
1873-2577
DOI:10.1016/0043-1648(95)06621-7