Accession Number : ADA335546

Title :   Nonlinear Finite Element Analyses of Damaged Stiffened Panels

Descriptive Note : Technical memo.

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT ATLANTICDARTMOUTH (NOVA SCOTIA)

Personal Author(s) : Hu, Thomas S.

PDF Url : ADA335546

Report Date : NOV 1997

Pagination or Media Count : 39

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 numerical 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 finite element results and their relation with the test observations. Some discussion and suggestions are also provided.

Descriptors :   *DAMAGE ASSESSMENT, *RESIDUAL STRESS, *SHIP HULLS, TEST AND EVALUATION, LOAD DISTRIBUTION, FINITE ELEMENT ANALYSIS, LOADS(FORCES), STRUCTURAL ANALYSIS, DEFORMATION, CANADA, STRENGTH(MECHANICS), BUCKLING, FRIGATES, NONLINEAR ANALYSIS, COLLAPSE, FORCE(MECHANICS), SEA WATER CORROSION, STRESS CONCENTRATION.

Subject Categories : Marine Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE