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INITIATION AND PROPAGATION OF SHORT FATIGUE CRACKS IN A WELD METAL
Author(s) -
Youshi Hong,
Yonghua Lu,
Zhemin Zheng
Publication year - 1989
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/j.1460-2695.1989.tb00540.x
Subject(s) - materials science , coalescence (physics) , crack closure , fracture mechanics , welding , fatigue testing , slip (aerodynamics) , ferrite (magnet) , lüders band , composite material , structural engineering , metallurgy , dislocation , engineering , physics , astrobiology , aerospace engineering
— Fatigue tests were performed using a purpose designed triangular shaped specimen to investigate the initiation and propagation of short fatigue cracks in a weld metal. It was observed that short fatigue cracks evolved from slip bands and were predominantly within ferrite grains. As the test progressed, the short crack density increased with minor changes in crack length. The growth of short cracks, in the early stage resulted mainly from coalescence with other existing cracks. The mechanism of short crack behaviour is discussed.