FRACTURE TOUGHNESS OF STEEL WELDMENTS AT HIGH LOADING RATES

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Authors
  1. Bassim, M.N.
  2. Matthews, J.R.
Corporate Authors
Manitoba Univ, Winnipeg MAN (CAN) Dept of Mechanical and Industrial Engineering;Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Fracture toughness for a number of submarine hull steels and steel weldments was determined at very high rates of loading, in excess of strain rates of E3 s 1(-), corresponding to loading rates of K larger than E6 MPa m 1/2 s 1(-) using a modified version of a Split Hopkinson pressure bar equipped with a swing arm mechanism. The parameter JIC was determined from measurement of the stretch zone width (SZW) using scanning electron microscopy on the fractured specimens. The impact tests were performed on compact tension specimens at -30C. Concurrently, two studies, one involving impact testing at slower velocities using a drop-weight tester and the other relating the measured SZW to the fatigue prestraining, were conducted. It was found that, while prestraining has a significant effect on the SZW, there are no significant differences in the SZW between using a nine-point approach, (ASTM) and a three point approach for very high strain rates.
Report Number
DREA-NAMT-93-2-PAP-6 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
25
DSTKIM No
99-00584
CANDIS No
510311
Format(s):
Hardcopy;Document Image stored on Optical Disk

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