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ASTM Selected Technical Papers
Case Histories Involving Fatigue and Fracture Mechanics
By
CM Hudson
CM Hudson
1
NASA-Langley Research Center
,
Hampton, VA
;
cochairman and coeditor
.
Search for other works by this author on:
TP Rich
TP Rich
2
Bucknell University
,
Lewisburg, PA 17837
;
cochairman and coeditors
Search for other works by this author on:
ISBN-10:
0-8031-0485-5
ISBN:
978-0-8031-0485-3
No. of Pages:
435
Publisher:
ASTM International
Publication date:
1986

This case study involves a hatch cover located on a pressurized barge unloading concrete. The hatch cover exploded as a workman was kicking off one of the locking cams holding the cover to the deck. The cover, attached to the barge by a hinge, utilized six locking cams to hold the pressure seal to the compartment. The cover was 0.51 metres in diameter and fabricated from A356-T6 aluminum. The pressure to off-load the cement was 206.8 kPa. A finite element study was performed to determine the stresses in the cover as a function of locking geometry. Fracture toughness tests to determine KIc, a nondestructive inspection to determine crack size and crack population, and a design study to determine pressure vessel design characteristics were undertaken. A failure analysis was also conducted. Results of the studies indicate that the design choices (internal piping, hatch cover attachment, and material selection) allowed a potentially catastrophic situation to develop. Recommendations for design improvements are given.

1.
Tada
,
H.
,
Paris
,
P.
, and
Irwin
,
G.
,
The Stress Analysis of Cracks Handbook
,
Del Research Corporation
,
Hellertown, PA
,
1973
.
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