Numerical analysis of blast on aluminium plates – Geometrical effects

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Authors
  1. Fillion-Gourdeau, F.
  2. Bolduc, M.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
Abstract
A series of experimental tests were conducted at DRDC Valcartier to verify the response of aluminium plates to air blasts. The experimental setup consisted of a rigid frame where sample plates were bolted. The frame had a square opening in its center in which a specimen plate could deform. The air blast was produced using C-4 explosive of different masses and placed at varying distances from the center of the samples. Specimen failure occurred at the edge of the opening where the square geometry induced a large amount of stress. To distribute stresses more evenly and allow the plate to fracture at the center, it was suggested to use a circular opening. The effectiveness of this concept was investigated numerically with finite element techniques. A simplified numerical model of the experimental setup was developed and loaded with the CONWEP air blast pressure model. The mass scaling factor in the CONWEP model was corrected to account for the measured impulse. The plate deflection is then used to verify the consistency of the numerical approach with the experimental techniques. Finally, the onset of plate failure was estimated by looking at the effective plastic strain at specific positions.

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Report Number
DRDC-VALCARTIER-TR-2010-066 — Technical Report
Date of publication
01 Nov 2010
Number of Pages
48
DSTKIM No
CA034694
CANDIS No
534187
Format(s):
Electronic Document(PDF)

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