FATIGUE CRACK INITIATION AS VIEWED BY SCANNING ELECTRON MICROSCOPY.
Abstract
It is pointed out that high internal stress, commonly regarded as necessary for initiating fracture by unidirectional deformation of a metal, does not seem essential to crack initiation by cyclic deformation of fatigue. An alternative whereby fatigue cracking can be started simply by the geometry of slip movement is generalized. The hypothesis was tested by the recently developed scanning electron-microscope for copper and aluminum specimens subjected to large amplitudes of cyclic strain (torsion), which gives a generalized type of slip movement. This technique in broadly confirming the hypothesis brings out striking forms of initial fatigue damage. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0704789
Entities
People
- William A. Wood
Organizations
- George Washington University