Feasibility of Detecting Impending Fatigue Failure in Metals by Observation of Surface Chemical and Physical Phenomena
Abstract
The purpose of the study was to investigate, through laboratory tests, the potential for developing fatigue indicators for metal surfaces. The response of photographic emulsions, phosphor coatings, and chemical indicator coatings to physical and surface-chemical reactions associated with fatigue damage in 2024-T3 aluminum was investigated. Many indicators were examined for their ability to meet the Army's requirements (1) under field conditions, (2) for long periods, and (3) for detection of damage that is characteristic of both high- and low-stress cycling. None of the candidate indicators was developed to a point where it showed promise for meeting these requirements during the contract period. Further investigation is recommended for one color indicator that was only briefly tested. Surface replication followed by microscopic examination was found to provide useful information on progressing fatigue damage.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1969
- Accession Number
- AD0856384
Entities
People
- Phillip J. Joseph
Organizations
- Calspan