Effect of Interspersed Periods of Heating on Fatigue Crack Initiation and Propagation in CM001 (RR58) Clad Sheet.
Abstract
Fatigue tests have been conducted to study the effect of interspersed periods of heating on the initiation and early growth of cracks from holes in clad sheet and also on later stages of crack propagation. The tests were under flight simulation loading and the material was CM001 (RR58) clad aluminium alloy sheet. Interspersed heating reduced the lives to initiate and grow cracks to 2mm and this is attributed to the softening of strain hardened material at the crack tip, but no effect was observed for longer crack lengths. When load was applied during the periods of heating creep redistribution of local stress retarded the growth of short and long cracks. Further work is underway to investigate fatigue-heat interactions under different load-temperature sequences, other forms of material, and over a wider range of crack lengths. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1976
- Accession Number
- ADA041014
Entities
People
- F. E. Kiddle