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The Effect of Post Fatigue Tensile Loading on Mechanical Properties and Failure Behaviour of Steel
Author(s) -
Maity Joydeep,
Kumar Shiv,
Bhattacharyya Ashish
Publication year - 2011
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201100001
Subject(s) - materials science , ultimate tensile strength , coalescence (physics) , void (composites) , ductility (earth science) , fatigue limit , fatigue testing , composite material , creep , physics , astrobiology
In this research work the early fatigue damage characteristics up to 50% of life has been investigated at near‐endurance stress amplitude in a medium carbon steel with hardened & tempered and normalized conditions by application of post fatigue tensile loading. During fatigue loading microvoids were generated at the interphase‐interface through vacancy clustering. Directional localized coalescence of these microvoids generated ‘void sheets’ in the normalized steel and ‘craters’ in the hardened & tempered steel. These defects acted as the potential sites for failure during post fatigue tensile loading deteriorating the mechanical properties. This was, therefore, clearly indicated that when a high tensile load is superimposed on near‐endurance fatigue loading, material may fail much earlier than its actual fatigue life. The normalized steel suffered from more reduction in ductility than the hardened & tempered steel indicating more susceptibility to fatigue damage.