高い平均応力下の溶接継手の平面曲げ疲れ強さに及ぼすグラインダ仕上及びピーニングの効果

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Many researches have been conducted on the influence of the surface finish of the weld toes on fatigue strength but little is known about fatigue strength of welded joints subjected to high mean stresses encountered in actual service of machines. In this paper, the effects of finish of the weld toes on bending fatigue strength for minimum stress Smin=0 and for high mean stresses in the neighbourhood of yield point Sy are investigated. Four kinds of finish, as welded, ground, peened and ground+peened were given to the weld toes of SM41 and HT60 respectively. The results are summarized as follows. (1) The fatigue strength (Stress amplitude) Sa of as welded for mean stress Sm at 5×(10)^6 cycles can be written as follow. SM41; Sa=10.3-0.125Sm HT60; Sa=14.3-0.158Sm. (2) The fatigue strength increases approximately in proportion to the reduction of mean stress concentration factor Kt by grinding for Smin=0 and for high mean stresses, if the finish is fine. However, for poor finish with remaining defects its effect is little in high cycle region with Smin=0. (3) The effect of peening is caused mainly by compressive residual stress induced by peening and little by work hardening in the case of both HT60 and SM41. Therefore significant increases in fatigue strength can be obtained by peening for Smin=0,but its effects vanishes in low cycle region with Smin=0 as well as entire region with high mean stresses because of the release of compressive residual stress induced by peening. (4) The fatigue strength of ground+peened can be estimated by superposing the effects of ground and peened.
社団法人溶接学会の論文
1975-07-05

高い平均応力下の溶接継手の平面曲げ疲れ強さに及ぼすグラインダ仕上及びピーニングの効果

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