TY - JOUR
T1 - Rib loading effects on weld root fatigue failure modes at rib-to-deck welded joint
AU - Luo, Pengjun
AU - Zhang, Qinghua
AU - Bao, Yi
N1 - Publisher Copyright:
© 2020 Wiley Publishing Ltd.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - The service life of orthotropic steel decks is dependent on the fatigue resistance of rib-to-deck welded joints, which is often tested using two kinds of experimental models in terms of the rib loading condition. Different weld root fatigue failure modes have been observed in the different models, but the role of rib loading remains unclear. This paper aims to clarify the effect of rib loadings on the weld root fatigue failure modes at rib-to-deck welded joints. The loadings are decomposed into the deck loadings and rib loadings according to the principle of superposition. Formulae of the weld root notch stress intensity factors and T-stress under rib loadings are developed by multiparameter regression analysis and subsequently used for the local stress analysis. The fatigue failure modes determined from the local stress field agree well with the experimental results. The results reveal that the weld root failure modes depend on the rib loadings but are independent of the weld geometries. The averaged strain energy density (SED) that can capture both weld geometry and loading condition effects is used to correlate the fatigue test data of different weld root failure modes. The SED is capable of evaluating the fatigue strength of the rib-to-deck welded joint failed by different weld root failure modes with a narrow scatter band.
AB - The service life of orthotropic steel decks is dependent on the fatigue resistance of rib-to-deck welded joints, which is often tested using two kinds of experimental models in terms of the rib loading condition. Different weld root fatigue failure modes have been observed in the different models, but the role of rib loading remains unclear. This paper aims to clarify the effect of rib loadings on the weld root fatigue failure modes at rib-to-deck welded joints. The loadings are decomposed into the deck loadings and rib loadings according to the principle of superposition. Formulae of the weld root notch stress intensity factors and T-stress under rib loadings are developed by multiparameter regression analysis and subsequently used for the local stress analysis. The fatigue failure modes determined from the local stress field agree well with the experimental results. The results reveal that the weld root failure modes depend on the rib loadings but are independent of the weld geometries. The averaged strain energy density (SED) that can capture both weld geometry and loading condition effects is used to correlate the fatigue test data of different weld root failure modes. The SED is capable of evaluating the fatigue strength of the rib-to-deck welded joint failed by different weld root failure modes with a narrow scatter band.
KW - fatigue failure mode
KW - fatigue test model
KW - local stress field
KW - notch stress intensity factor
KW - weld geometry
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U2 - 10.1111/ffe.13203
DO - 10.1111/ffe.13203
M3 - Article
AN - SCOPUS:85078972016
SN - 8756-758X
VL - 43
SP - 1399
EP - 1418
JO - Fatigue and Fracture of Engineering Materials and Structures
JF - Fatigue and Fracture of Engineering Materials and Structures
IS - 7
ER -