AN ELECTRON MICROSCOPE INVESTIGATION OF FATIGUE FRACTURES IN A HIGH-STRENGTH SHEET STEEL,
Abstract
The electron microscope was used to study the fracture surfaces of center-slotted sheet steel specimens that were tension-tension fatigued to failure. Typical fatigue fracture markings were found on the slow crack growth regions of annealed specimens but were not found on the same regions of hardened and tempered specimens. The transition from slow crack growth to rapid fracture propagation in the hardened specimens took place over an extended length of the fracture surface. Alternating areas of slow and rapid fracture propagation produced a banded structure in this transition zone. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1962
- Accession Number
- AD0428131
Entities
People
- E. P. Dahlberg
Organizations
- United States Naval Research Laboratory