PREDICTION OF THE LOW-CYCLE FATIGUE LIFE OF HY-100 UNDERMATCHED WELDS IN MARINE STRUCTURES

Finite element and analytical models are used in this study to predict the low-cycle fatigue life of undermatched (lower yield strength) weldments of HY-100 steel. The objective was to determine the feasibility of replacing conventional overmatched welds in marine structures. Fatigue tests were performed on standard, smooth specimens, notched cylindrical specimens and a four-point- bend test on a full scale butt beam specimen. Numerical analyses were conducted using finite elements, with a two-surface plasticity algorithm to simulate the cyclic behaviour of the individual materials. The stress and strain concentrations at the notches were also evaluated using two analytical models: the Neuber and Glinka relations. The finite element predictions compared well with experimental data and produced detailed predictions of the strain distributions, which were then used to assess the crack initiation life. Flinka's relation demonstrated superior predictive capabilities for local strains over Neuber's relation.

  • Supplemental Notes:
    • J Ship Production, v 11 n 2, May 1995, p 71 [10 p, 16 ref, 2 tab, 17 fig]
  • Authors:
    • Shah, R S
    • Wang
    • K-C
    • Kleinosky, M J
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00719021
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 27 1996 12:00AM