Development of the Microstructure Based Stochastic Life Prediction Models
Abstract
The microstructural features of 7050 T7451 aluminum alloy in the vicinity of fatigue cracks and on the crack path were studied to determine which of them influence fatigue crack propagation. The studies included characterization of the full spectrum of microstructural and fracture surface features starting from the largest ones such as roughness and grain type to the smallest such as second phase particles and dislocations. Of all the features studied, only the second phase particles were shown to have a definite influence by causing crack deflection. The number of particles encountered by the fatigue cracks were significantly higher than the expected average. The fatigue crack path was predominately transgranular and there was no changes in the dislocation and precipitation structures in the crack affected zone.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1993
- Accession Number
- ADA269880
Entities
People
- Annetta J. Luevano
- Jimin Zhang
- Marek A. Przystupa
Organizations
- University of California, Los Angeles