鋼隅肉溶接継手の曲げ疲労強度に及ぼす隅肉形状等の影響

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Reversed bending fatigue tests were carried out in low and high cycle fatigue range on fillet welded joint specimens, which were welded by using 25.4mm thick ship structure steel of the tensile strength of 47 kg/mm^2. The influencing factors investigated are leg length, throat depth, flank angle, profile of fillet weld and undercut. The specimen was loaded under the condition of constant amplitude of bending deflection of the intercostal plate in low cycle fatigue range, and under the condition of constant amplitude of load applied to the through plate. The main conclusions obtained are as follows : (1) The critical throat depth which is defined as the transition value classifying toe and root failure was found t be a function of the fatigue failure life N_f or the nominal stress amplitude S_a. The critical throat depth a_<CR> is given by the following empirical expressions. a_<CR>/T=0.236 log S_a+0.00078θ-0.110 a_<CR>/T=0.468-0.0632 log N_f+0.0012θ where T and θ are plate thickness and flank angle, respectively. (2) The strain range measured at a point 4mm apart from a toe of fillet weld _R(4) is available for the prediction of the fatigue life in case of toe failure. The expression obtained for the prediction of 1% failure probability is _R(4)=6.40510^<-4>5.65510^<-2>N_c^<-0.4772> The X curve in AWS Code D 1.1-72 may provide an unsafety prediction of fatigue life, especially in low cycle fatigue range, by comparing with the above expression. (3) The undercut may act as a reducing factor of approximately 10 to 25 percent for bending fatigue strength.
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鋼隅肉溶接継手の曲げ疲労強度に及ぼす隅肉形状等の影響

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