Determining fatigue limits with thermal analysis of static traction tests

ABSTRACT This work evaluates the limit stress of the thermo‐elastic phase of deformation by thermo‐analysing the surface of a specimen during a static traction test. By adding a temperature curve measured over a small area of the surface to the classical stress–strain curve, it is possible to evalua...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2013-07, Vol.36 (7), p.631-639
Main Authors: Risitano, A., Risitano, G.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fatigue
Fatigue failure
Fatigue life
Fatigue limit
IR images
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
mono-axial static test
Nonlinearity
RMR
Static electricity
Stress strain curves
Stress-strain relationships
Stresses
Structural steels
Tests
Thermal energy
Traction
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Summary:ABSTRACT This work evaluates the limit stress of the thermo‐elastic phase of deformation by thermo‐analysing the surface of a specimen during a static traction test. By adding a temperature curve measured over a small area of the surface to the classical stress–strain curve, it is possible to evaluate a limit temperature T0 that is coincident with the beginning of the curve's nonlinear trend. The corresponding stress value is as estimation of the fatigue limit of the component under analysis. The authors derive an expression to evaluate temperature during a mono‐axial static traction test. As an example, temperature curves recorded during traction tests performed on two notched steel specimens are reported and compared with this proposed expression. The change to the linearity in the temperature curve during the static traction test is evident in these examples and the corresponding stress value is an estimation of the fatigue limit of the component under analysis.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12030