THE MEASUREMENT OF ELASTIC STRAIN FIELDS AND LINE-BROADENING NEAR CRACKS IN LOADED BARS OF HY-80 STEEL

PDF

Authors
  1. Holden, T.M.
  2. Root, J.H.
  3. Mecke, J.F.
  4. Porter, J.
Corporate Authors
Atomic Energy of Canada Ltd, Chalk River ONT (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The elastic strain fields in theneighbourhood of 6 mm and 20 mm deep cracks in bars loaded in three-point bending were measured by neutron diffraction. Calculations of the elastic strain field under the known loads included a stress-concentration contribution approximated by linear elastic fracture mechanics (LEFM). Close to the crack tip, the calculated load-induced strains with the LEFM contribution are in reasonable agreement with the measurements although the agreement is not good far from the crack. The diffraction linewidths can be related to the plastic deformation within the region of measurement. A 20% increase in linewidth occured ahead of and behind the crack tip, and near the uncracked surface adjacent to the central support for the three-point bending. The radius of the enhanced linewidth region was about 5 mm near the crack tip.
Report Number
DREA-NAMT-93-5-PAP-22 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
27
DSTKIM No
99-00601
CANDIS No
510327
Format(s):
Hardcopy;Document Image stored on Optical Disk

Permanent link

Document 1 of 1

Date modified: