Corrosion-Induced Multiple Site Damage
Abstract
This research focuses on three key issues related to the nucleation and growth of corrosion fatigue cracks in fuselage fastener holes. (1) The identification of the precise mechanisms responsible for corrosion damage in Al alloy 2024-T3 in the bare, clad, and painted condition. (2) The transitional behavior from corrosion damage to fatigue crack growth nucleation and subsequent short crack growth, and (3) a real-time statistically based model of damage evolution in a structural element. Another aspect of the multiple site damage (MSD) problem that we address is related to the striking observation that there is relative size uniformity of the fatigue cracks from rivet to rivet. The transition from uniform damage (mean field behavior) to that dominated by the propagation of the largest crack in the system is a key aspect of lap joint failure. Often, the onset of such a transition is determined by monitoring the changes occurring in a suitable order parameter. Several possible scenarios for this behavior are explored including chemical short crack effects, and local load redistribution processes similar to what occurs during damage evolution in parallel bar models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 2002
- Accession Number
- ADA405601
Entities
People
- Dusan Krajcinovic
- K. Sieradzki
Organizations
- Arizona State University