NONLINEAR FINITE ELEMENT ANALYSES OF DAMAGED STIFFENED PANELS

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Authors
  1. Hu, T.S.Z.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Ship hulls suffer various types of damage during operation. This damage can be corrosion caused by the marine environment or dents resulting from external forces. In order to make efficient repair decisions, residual strength of the damaged component needs to be assessed. The assessment can be carried out with numericla models such as nonlinear finite element methods or simplified approaches, but this requires experimental verification. DREA conducted a joint stiffened panel strength testing project with the U.S. Interagency Ship Structural Committee (SSC). Five stiffened panels in this project, having dimensions approximately equal to a typical stiffened panel at the upper deck of the Canadian Patrol Frigate (CPF), had deliberately created damage. Three of the panels had part of the web or flange of the stiffener removed while the other two had permanent deflection caused by large lateral forces. A series of finite element analyses were conducted to predict the collapse load as well as to simulate the buckling behaviour. This memorandum summarizes the finitie element results and their relation with the test observations. Some discussion and suggestions are also provided.
Keywords
Stiffened panel;Nonlinear Finite Element Method;Residual stress;Initial imperfections
Report Number
DREA-TM-97-254 — Technical Memorandum
Date of publication
01 Nov 1997
Number of Pages
36
DSTKIM No
98-00360
CANDIS No
507073
Format(s):
Hardcopy;Document Image stored on Optical Disk

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