Corrosion and Corrosion Fatigue of Aluminum Alloys: Chemistry, Micromechanics and Reliability
Abstract
Lehigh University undertook a 3-year, multidisciplinary program of research, under AFOSR Grant No. F49620-98-1-0198, to further develop a basic mechanistic understanding of the damage evolution processes of localized corrosion and corrosion fatigue crack nucleation and growth in aluminum alloys used in aircraft construction, and to formulate mechanistically based probability models for reliability assessment and life-cycle management based on this understanding. Research was initiated on 1 February 1998 and was extended to 31 July 2001. The objectives of the program are: (1) the development of basic understanding of the processes of localized corrosion and corrosion fatigue crack nucleation and growth in high strength aluminum alloys used in airframe construction; (2) the formulation of kinetic models for these elemental processes; and (3) the integration of these models into probabilistic models that can provide guidance in formulating methodologies for service life prediction and fleet management. Research carried out under this grant has demonstrated the need and the feasibility for developing mechanistically based probability models (versus statistically based parametric models) for the evolution of damage from time-dependent processes, such as corrosion and corrosion fatigue. Such models need to be integrated along with other science-based methods, into a new paradigm for the overall optimization of design, manufacturing, operation and disposal and for life-cycle management of engineered systems. A challenge is made to the research and engineering community, as well as industry, and sponsoring agencies, to focus on the development of this new paradigm for designing reliable and affordable engineered systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1998
- Accession Number
- ADA396382
Entities
People
- D. G. Harlow
- Robert P. Wei
Organizations
- Lehigh University