溶接継手の疲労強度に関する板厚効果評価基準の検討

概要

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In this study, the thickness effect was investigated by systematic experiments on welded steel joints with thicknesses ranging from 10 to 80mm. Cruciform joints and Tee joints with improved weld by overall profiling or toe-grinding were tested under pulsating tension and under pulsating bending, respectively. These experimental results were analyzed together with the previous results of as-welded joints. As a result, it was concluded that the thickness effect exponents for various conditions may be classified into three categories according to the combination of joint type and loading mode. As-welded joints under bending stress have the greatest thickness effect exponent of -1/3, while as-welded joints under tension having an exponent of -1/5. If the weld profile is improved by grinding, the thickness effect becomes much milder to an exponent of -1/10. The as-welded joints with constant-sized attachments also have an exponent of -1/10. Furthermore, thickness effect dependency on fatigue life was investigated. Based on these results, a new evaluation criterion for design purposes has been proposed in this study.
社団法人日本船舶海洋工学会の論文