METALLURGICAL EVALUATION OF DEFECTS IN EXPLOSIVELY LOADED PLATES

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Authors
  1. Pussegoda, L.N.
  2. Malik, L.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Fleet Technology Ltd, Kanata ONT (CAN)
Abstract
Tested explosion bulge panels, each containing a double V-groove weld in a 25mm thick plate, were broken open at the weld when immersed in liquid nitrogen employing a three point bending arrangement. The primary objective was to expose both initial flaws, resulting from a lack of fusion, and those that propagated as a result of the explosion bulge test. Two types of flaws, (a) root and (b) cap, were designed to be present using a controlled welding process. The lack of fusion flaws at root propagated through the thickness of the plate. The cap flaws, on the other hand, only extended by small amounts on the convex side of the bulge panels, in all cases propagating to that surface. The cap flaws in the concave side did not propagate. The mechanism of flaw propagation was identified as ductile as observed, in the SEM, by microvoids. The length, location with respect to thickness and mean depth of the initial flaws were measured on the exposed fracture surface. These measurements were compared with those made in an earlier program using an ultrasonic test method. At selected locations, one side of the fracture surface was used to perform cross-sectional metallography to confirm initial flaw locations and determine its propagation with respect to the weld microstructure. The other side of the opened up fracture surface was mounted on a display panel that was designed to illustrate the observations made in this program.
Report Number
DREA-CR-95-501 — Contractor Report
Date of publication
15 Jan 1996
Number of Pages
21
DSTKIM No
96-02866
CANDIS No
499396
Format(s):
Document Image stored on Optical Disk;Hardcopy

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