Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
2005-11-15
2005-11-15
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
Reexamination Certificate
active
06964202
ABSTRACT:
The onset of rolling contact fatigue in an object may be detected by measuring the residual stresses in the surface of the object, and monitoring changes in their magnitude or their direction. The values of residual stresses in the surface are those averaged over a depth that may be in the range say 0.1 mm to 8.0 mm, for example about 2.5 mm. For ferromagnetic objects such as rails, the method may utilize an electromagnetic probe. Prior to rolling contact fatigue the surface stresses are compressive, and the onset of rolling contact fatigue may be characterized by a marked decrease of the stress in the generally transverse direction.
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Buttle et al.;“Probe Modelling to Enable Biaxial Stress Measurement Depth Profiling”; ISO Press 1995, pp. 41-52.
David J. Buttle, William Dalzell, and Peter J Thayer; “Nondestructive Rapid Residual Stress Measurements in Rail Heads with Maps”; This paper was presented at a conference, in conference proceedings issued on Sep. 18, 2001.
D J Buttle, W Dalzell and P J Thayer; “Non-destructive Residual Stress Measurement in Rail Heads and Rolling Contact Fatigue”; INSIGHT, vol. 44,No. 6, Jun. 2002, pp 364-368.
Buttle David John
Dalzell William
Thayer Peter John
AEA Technology PLC
Ellington Alandra
Holt WillIam H.
Noori Max
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