溶接継手の疲労限度に及ぼす余盛形状因子の影響

概要

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This paper deals with the effect of each factor in the reinforcement on the fatigue limit of welded joint.Fatigue specimens were made by using an electrospark machining for changing only one factor of the reinforcement without leaving any residual stress,incresing hardness and so on.As the toe radius of weided joint is very small,the fatigue limit of welded joint is decided by the condition that a non-propagating crack starts to propagate.Therefore it was investigated whether the fatigue limit is given by a critical stress intensity factor or not.the stress intensity factor was calculated by use of a program of boundary element method.The following conclusions are obtained : The fatigue limit of welded joint is predictable by using a stress intensity factor.The height of reinforcement (h) does notaffect the fatigue limit when h is greater than 2 mm in case of plate thickness being 4 mm.The effect of widtf in the reinforcement on the fatigue limit depends on the loading condition of fatigue test.The flank angle (θ) does not affect the fatigue linit in case of θbeing grsater than 60 degree.
社団法人日本材料学会の論文
1990-07-15