TY - GEN
T1 - A simple estimation method of the stress distribution normal to cross section at weld toe in non-load carrying welded joints
AU - Gotoh, Koji
AU - Nagata, Yukinobu
AU - Toyosada, Masahiro
PY - 2006/11/30
Y1 - 2006/11/30
N2 - Many fatigue damages are occurred in the welded built-up structures designed by the hot spot stress methodology, especially near a boxing fillet weld toe. These fatigue cracks usually initiate from the toe and propagate to the plate thickness direction. Although fatigue life is affected by the stress gradient working over crack propagation path, the effect of stress gradient in cross section is not considered in the hot spot stress methodology. Then, many attempts based on fracture mechanics for the improvement of fatigue life estimation are proposed. Whereas stress distributions along the fatigue crack path must be given in order to apply the methods based on fracture mechanics for the precise fatigue life prediction, no stress distribution along the path considering the stress concentration caused by weld toe shape is obtained in practical structural design stages because the shell elements are used infinite element analyses in the design stages. A simple estimation method of the stress distribution normal to cross section at weld toe in non-load carrying welded joints is proposed in this paper. Calculation results of finite element analysis with shell elements and geometrical conditions (radius and flank angle of fillet weld toe and plate thickness) are used as input data for the estimation. The validity of this method is confirmed by comparing estimation results with ones by finite element analysis with solid elements.
AB - Many fatigue damages are occurred in the welded built-up structures designed by the hot spot stress methodology, especially near a boxing fillet weld toe. These fatigue cracks usually initiate from the toe and propagate to the plate thickness direction. Although fatigue life is affected by the stress gradient working over crack propagation path, the effect of stress gradient in cross section is not considered in the hot spot stress methodology. Then, many attempts based on fracture mechanics for the improvement of fatigue life estimation are proposed. Whereas stress distributions along the fatigue crack path must be given in order to apply the methods based on fracture mechanics for the precise fatigue life prediction, no stress distribution along the path considering the stress concentration caused by weld toe shape is obtained in practical structural design stages because the shell elements are used infinite element analyses in the design stages. A simple estimation method of the stress distribution normal to cross section at weld toe in non-load carrying welded joints is proposed in this paper. Calculation results of finite element analysis with shell elements and geometrical conditions (radius and flank angle of fillet weld toe and plate thickness) are used as input data for the estimation. The validity of this method is confirmed by comparing estimation results with ones by finite element analysis with solid elements.
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U2 - 10.1115/OMAE2006-92094
DO - 10.1115/OMAE2006-92094
M3 - Conference contribution
AN - SCOPUS:33751366865
SN - 0791837777
SN - 9780791837771
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
SP - 8P
BT - Proceedings of 25TH International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2006
T2 - 25TH International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2006
Y2 - 4 June 2006 through 9 June 2006
ER -