10. Thickness and Effect of Fatigue Strength in As-Welded and Post-Weld-Treated Steel Joints

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概要

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• The influencing factors on the thickness effect of fatigue strength were investigated through systematic series of experiments on welded steel joints with thicknesses ranging from 10 to 80mm. Fillet-welded joints with as-welded condition and with weld improved by grinding were tested under pulsating tension and bending. As a result, it was revealed that the thickness effect is clearly influenced by the combination of main plate thickness and attachment size. As for the other influencing factors, pulsating bending has shown a greater thickness effect than pulsating tension. The thickness effect for crack initiation was largest, and it was followed by failure life and then by crack propagation life. Thickness effect also depends on the number of cycles to failure. The longer the fatigue life, the greater the thickness effect. And the post-weld treatment by grinding remarkably reduces the thickness effect. 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 steepest thickness effect exponent m of -1/3, while as-welded joints under tension with m = -1/5 is milder in thickness effect than that specified in the existing codes. If the weld profile is improved by grinding, the thickness effect becomes much milder to m = -1/10. The as-welded joints with constant-sized attachments also have m of - 1/10. Based on these results, this study proposes a new evaluation criterion for design purposes.

• 社団法人日本船舶海洋工学会の論文

著者

• Matoba Masaaki

  University Of Tokyo

• Machida Susumu

  University Of Tokyo

• SOYA Isao

  Nippon Steel Corporation

• Yagi Junkichi

  Emeritus Professor of Osaka University

• Tomita Yasumitsu

  Osaka University

関連論文

• Fatigue Crack Propagation Curve for Design of Welded Structures
• Study on Fracture Strength Assessment of Structural Components
• 11. On the Correlation between Charpy Impact Value and Fracture Toughness of Welded Joint with Angular Distortion and Misalignment
• 12. Study on Fast Fracture and Crack Arrest
• 10. Thickness and Effect of Fatigue Strength in As-Welded and Post-Weld-Treated Steel Joints
• 13. Effect of Notch Acuity on Critical COD
• 16. An Analysis for Fatigue Failure of Ship Structural Members
• 13. Method for Estimating Fatigue Strength Diagram under Random Loading Conditions
• 12. Cyclic Local Strain Range for Fatigue Life Estimation of Notched Plate

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