Open AccessFatigue properties and fracture mechanism of load carrying type fillet joints with one-sided welding
Author(s) -
Takamasa Abe,
Hiroyuki Akebono,
Masahiko Katô,
Atsushi Sugeta
Publication year - 2015
Publication title -
frattura ed integrità strutturale
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.368
H-Index - 19
ISSN - 1971-8993
DOI - 10.3221/igf-esis.35.48
Subject(s) - fillet (mechanics) , materials science , structural engineering , welding , mechanism (biology) , composite material , fillet weld , fracture (geology) , engineering , philosophy , epistemology
The structures of the hydraulic excavator and the crane have numerous one-sided welded joints.\udHowever, attachments with box like structures are difficult to weld at both sides. Therefore, high accurate\udevaluation method is needed. In this study, the fatigue properties and the fracture mechanism of the load\udcarrying type fillet joints with one-sided welding were investigated experimentally to evaluate its fatigue damage\udwith high accuracy based on the experimental results. As the results, fatigue cracks in the test piece initiated from\udthe tip of the unwelded portion and propagated into the welding materials. Multiple welding defects were observed in the\udunwelded portion, but did not appear to be crack origins. Although these welding defects affected the direction of crack\udpropagation they exerted minimal influence. The three-dimensional observations revealed that fatigue cracks initiate at an\udearly stage of the fatigue development. We infer that the fatigue lifetime is chiefly governed by the crack propagation\udlifetime. Cracks were initiated at multiple sites in the test piece. As the number of cycles increased, these cracks\udpropagated and combined. So considering the combination of cracks from multiple crack origins is important for a precise\udevaluation of fatigue damage