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Fatigue fracture assessment of 10CrNi3MoV welded load‐carrying cruciform joints considering mismatch effect
Author(s) -
Song Wei,
Liu Xuesong,
Xu Jie,
Fan Yu,
Shi Duanhu,
He Min,
Wang Xiaoxi,
Berto Filippo
Publication year - 2021
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.13457
Subject(s) - cruciform , structural engineering , fracture mechanics , welding , materials science , stress intensity factor , parametric statistics , stress concentration , fracture (geology) , paris' law , compact tension specimen , crack closure , crack growth resistance curve , composite material , engineering , mathematics , statistics
Abstract Fatigue experiments and numerical simulations based on the linear elastic fracture mechanics (LEFM) theory were conducted on the evenmatched (EM) and undermatched (UM) 10CrNi3MoV load‐carrying cruciform welded joints (LCWJs). The study firstly experimentally investigated the fatigue crack growth rate (FCGR) of base metal, EM, and UM weldments. The corresponding Paris parameters as essential input data are provided to assess the fatigue crack propagation behavior for weld toe and weld root failure caused by notch stress concentration variations. On the one hand, the stress intensity factors (SIFs) at weld toe and weld root were calculated considering the effects of LCWJ specimen geometries, initial crack types, and sizes. The comparisons between simulated results and standards analytical solutions were executed, which exhibit good accordance. It proved that the fatigue fracture simulation procedure based on LEFM is appropriate for the fatigue assessment of LCWJs. Eventually, it conducted the parametric analysis by predicted S – N curves, which included in the weld length, initial crack shape, initial crack size, penetration length, and materials fracture parameter, to explore some safety assessment reference lines for both failure modes of LCWJ.