THE EFFECT OF LOADING SEQUENCE ON FATIGUE CRACK GROWTH OF AN OFFSHORE STRUCTURAL STEEL

Fatigue cracks growth tests of RQTuf 501 were conducted under different loading systems i.e. constant amplitude (CA), sequential amplitude (SA), and variable amplitude (VA) loading. The CA fatigue tests were conducted in both air and natural sea water with stress ratios of 0.1 and 0.7. The SA fatigue tests were carried out in natural sea water at R ratio of 0.1, using blocks of 1K cycle low stress range within a higher stress range background at 10K and 1K intervals respectively. The VA loading fatigue tests were performed in both air and sea water using s wave action standard history sequence. Cathodic protection was applied on certain corrosion fatigue tests. The various factors involved in this work, such as environment, stress ratio, cathodic protection, loading states and crack closure etc., which influence the effect of loading conditions on fatigue crack growth behaviour were considered. The fatigue mechanisms were examined and analysed using scanning electron microscopy.

• Supplemental Notes:
  • ISOPE 93, 3rd Intl Offshore & Polar Engng Conf; 6-11 June 1993; Singapore. Sponsored by ISOPE, U.S.A. et al. Procs. Publ by ISOPE, ISBN 1-880653-08-7. Vol IV, p 98 [6 p, 16 ref, 2 tab, 10 fig]
• Authors:
  • Zhang, Wenfen
  • Brook, R
• Publication Date: 1993

Language

• English

Subject/Index Terms

• TRT Terms: Cathodic protection; Cracking; Loads
• Uncontrolled Terms: Crack propagation
• Subject Areas: Construction; Marine Transportation;

Filing Info

• Accession Number: 00707495
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM