MONOBLAST EXPLOSION BULGE EVALUATION OF HYW700QT SUBMARINE PRESSURE HULL STEEL

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Authors
  1. Porter, J.F.
  2. Morehouse, D.O.
  3. Gorveatte, G.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
In support of the development project to create a "made in Canada" submarine pressure hull steel and weldment, the DREA developed monoblast explosion bulge procedure was employed to evaluate the dynamic deformability of two inch thick HYW700QT steel plate and weldments. In explosion bulge evaluations, to qualify as a suitable material for submarine pressure hull applications, the test samples must attain a preset degree of plastic strain prior to the formation and extension of cracking. For HYW700QT the pass/fail strain level required was defined as 12 percent reduction in thickness at the bulge apex. Six unwelded and two welded plates were prepared for evaluation. The first three unwelded plates were intended to define the relationship between charge weight employed and the strain level attained, while the remaining three unwelded plates were to be deformed to the qualification strain level. Following evaluation of the second plate, the strain levels attained became erratic, as a result of damage incurred by the anvil during the second explosive loading. Although in-situ repairs were attempted between shots, the anvil remained insufficiently rigid. Despite these difficulties, one plate surpassed the 12 percent qualification strain level while two other plates attained over 11 percent thining. One of the two welded samples surpassed the 12 percent strain level while the other reached 10.5 percent, without the formation of cracking.
Report Number
DREA-NAMT-93-6-PAP-24 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
19
DSTKIM No
99-00603
CANDIS No
510329
Format(s):
Hardcopy;Document Image stored on Optical Disk

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