Fatigue Considerations in View of Measured Load Spectra.
Abstract
Crack propagation in HY-80 and CS ship steel under typical ship loading time-histories was studied. The loading histories were selected from recorded service stress data which were generated during voyages by the SL-7 containership. Samples of the data were imposed on laboratory specimens as a tape loop signal speeded up by a factor of 25. Analysis of the results indicated that the crack growth during this random loading compared closely with that of constant-amplitude loading if the stress intensity range were expressed as the root-mean-square. It was also determined that significant crack growth retardation effects were present and that omission of low-amplitude high-frequency components of the loading had little effect on the time rate of growth of cracks. The potentially large effects of environment on crack growth rate were recognized but were not included in the scope of this work. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1983
- Accession Number
- ADA140221
Entities
People
- J. Giannotti
- J. W. Wheaton
- K. A. Stambaugh
- R. F. Brodrick
- W. G. Dobson
Organizations
- Teledyne Technologies