NONDESTRUCTIVE EVALUATION OF METAL FATIGUE.
Abstract
This report includes a discussion of the magnetic techniques and magnetic inspection - fatigue tester equipments. The design and construction of new electronics for use with the Bismuth Hall probes is summarized. Results obtained from fatigue tests to determine the required stress level for reasonable life are analyzed, and photographs of many fracture surfaces are included. A brief summary of the nondestructive detection of fatigue damage using the magnetic inspection equipment is given. Relationships between magnetic signals and visible fatigue damage prior to failure are presented. The effects of magnetic field strength and static loads applied during inspection on the fatigue damage indications are summarized. A detailed discussion of the inspection results obtained on seven stress cycled specimens is included. Many magnetic inspection records, surface photographs and graphs illustrating the occurrence and characteristics of the magnetic signals which indicate fatigue damage development are presented. Other experiments which include the programmed loading of a fatigue damaged specimen and the determination of residual stresses in the vicinity of a fatigue crack are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 13, 1964
- Accession Number
- AD0600277
Entities
People
- Felix N. Kusenberger
- John R. Barton
- W. Lyle Donaldson
Organizations
- Southwest Research Institute