FATIGUE ENDURANCE OF WELDED JOINTS, RESIDUAL STRESSES AND FATIGUE IMPROVEMENT TREATMENTS

A method of calculating the effect of residual stresses on the cyclic endurance of welded joints, which makes it possible to estimate with an accuracy sufficient to practice the role of residual stresses in the fatigue process in relation to the type of weld, mechanical properties of base metal and external loading parameters was developed. A new ultrasonic impact peening treatment is introduced. The fatigue improvement treatment is based on the introduction of compressive residual stresses into areas of high stress concentration, reduction in stress concentration associated with welds local geometry and plastic deformation strengthening of surface metal layer. A quantitative assessment of effectiveness of fatigue improvement treatments was developed. This paper briefly describes the assessment. Comparison of the calculated values with the experimental data indicates satisfactory agreement (difference does not exceed 10%).

• Supplemental Notes:
  • Ship Structures Symposium '93; 16-17 Nov 1993; Arlington, Virginia, USA. Pprs. Publ by SNAME and the Ship Structure Committee, USA. Ppr N [14 p, 17 ref, 13 fig]
• Authors:
  • Trufyakov, V I
  • Mikheev, P P
• Publication Date: 1993

Language

• English

Subject/Index Terms

• TRT Terms: Fatigue (Mechanics); Joints; Residual stress; Welds
• Uncontrolled Terms: Fatigue life; Welded joints
• Subject Areas: Bridges and other structures; Marine Transportation;

Filing Info

• Accession Number: 00718324
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 27 1996 12:00AM