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Research on fatigue crack propagation behaviour of 4003 ferritic stainless steel based on infrared thermography
Author(s) -
Zhang H. X.,
Wei C. Y.,
Yan Z. F.,
Wang W. X.,
Guo S. F.,
Zhou Y. G.
Publication year - 2016
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 - 10.1111/ffe.12352
Subject(s) - thermography , materials science , infrared , thermoelastic damping , scanning electron microscope , fracture (geology) , fracture mechanics , composite material , atmospheric temperature range , thermal , thermodynamics , optics , physics
Fatigue crack propagation (FCP) behaviour of 4003 ferritic stainless steel was investigated using infrared thermography. Four stages of superficial temperature evolution were observed during the FCP tests: an initial temperature decrease stage, a temperature equilibrium stage, a slow temperature increase stage and an abrupt temperature increase stage; a thermal model is developed to explain the observed temperature evolution. The experimental results indicate that: when the range of stress intensity factor (Δ K ) is at a low level where the crack is located in slow propagation region, thermoelastic effect will be in dominant status; when the Δ K is at a high level where the crack is located in stable propagation region, the temperature rise can be used to describe FCP rate. The fatigue fracture surfaces were examined using scanning electron microscope (SEM) in order to understand the effect of the fatigue mechanisms on temperature variation.