Repetitive Impact Loading to Simulate Launch and Recovery Cycles for Composite Fatigue Performance and Damage Tolerancing
Abstract
Naval aircraft must sustain mission readiness while experiencing launch andrecovery, as well as other sub-catastrophic impact cycles that place the structure underrepetitive impulsive loading profiles. While there is a concerted effort to introducecomposites in Naval structures due to their decrease in weight and improved specificstrength and corrosion resistance when compared with metals, special considerationsmust be made for impact fatigue in extreme environments. Unlike classical fatigue,impact waves reflect and transmit from the boundaries and interfaces of the structure,giving rise to complex, heterogeneous stress states leading to damage initiation siteswithin the microstructure. These wave interactions, particularly when combined withenvironmental loading considerations of water uptake and temperature changes, candrastically modify load accommodation and redistribution in the material, therebychanging the onset of damage and reducing the working fatigue life of the structure.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 17, 2020
- Source ID
- N000142012607
Entities
People
- Leslie Lamberson
Organizations
- Colorado School of Mines
- Office of Naval Research
- United States Navy