Accession Number:
ADA109890
Title:
The Plastic Zone and Residual Stress near a Notch and a Fatigue Crack in HSLA Steel.
Descriptive Note:
Technical rept.,
Corporate Author:
NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE
Personal Author(s):
Report Date:
1981-12-16
Pagination or Media Count:
55.0
Abstract:
The plastic zone and residual stress around a notch under load and with the load removed, and around a fatigue crack at the same stress intensity factor as for the notch have been examined, with automated X-ray techniques and a microbeam. There is a good agreement between the measured plastic zone size and Hutchinsons theory for a work hardening material. Residual stresses exist well behind the tip, and vary with depth, so that measurements of crack closure on a surface may not be directly related to closure stress which samples the bulk. Instabilities in the dislocation arrangement can be detected by comparing X-ray line broadening of bulk specimens under load, and with the load removed. Author
Descriptors:
Subject Categories:
- Properties of Metals and Alloys
- Test Facilities, Equipment and Methods
- Mechanics