Accession Number : ADA309321

Title :   Guideline for Evaluation of Finite Elements and Results.

Descriptive Note : Final rept.,

Corporate Author : MIL SYSTEMS ENGINEERING OTTAWA (ONTARIO)

Personal Author(s) : Basu, R. I. ; Kirkhope, K. J. ; Srinivasan, J.

PDF Url : ADA309321

Report Date : DEC 1995

Pagination or Media Count : 259

Abstract : Finite element analysis (FEA) is the most common structural analysis tool in use today. In marine industries, the use of this technique is becoming more widespread in the design, reliability analysis and performance evaluation of ship structures. Users of FEA have considerable freedom in designing the finite element model, exercising it and interpreting the results. Key components of this process include the selection of the computer program, the determination of the loads and boundary conditions, development of the engineering model, choice of elements and the design of the mesh. A consequence of this freedom is that significant variability in FEA results can be obtained depending on the assumptions and modelling practices adopted by the analyst. A special difficulty is faced by those who have the responsibility for assessing and approving FEAs. Unsatisfactory analysis is not always obvious and the consequences usually will not manifest themselves until the vessel is in service. The individual concerned may not be an expert in FEA, or familiar with the software package used, and will face a dilemma when coming to judge the acceptability, or otherwise, of the results of the FEA. In response to the difficulty faced by those who evaluate FEAs, a systematic and practical methodology has been developed to assess the validity of the FEA results based on the choice of analysis procedure, type of element/s, model size, boundary conditions, load application, etc. In support of this methodology, a selection of finite element models that illustrate variations in FEA modelling practices are also presented. Benchmark tests have also been developed which can be used to evaluate the capabilities of FEA software packages to analyze several typical ship structure problems.

Descriptors :   *FINITE ELEMENT ANALYSIS, *STRUCTURAL ANALYSIS, *SHIP STRUCTURAL COMPONENTS, MATHEMATICAL MODELS, SOFTWARE ENGINEERING, PARAMETRIC ANALYSIS, STRESS ANALYSIS, COMPUTER AIDED DESIGN, STATIC LOADS, STRUCTURAL MECHANICS, DEFORMATION, STIFFNESS, DISPLACEMENT, ACCURACY, DEGREES OF FREEDOM, STRUCTURAL RESPONSE, BUCKLING, DYNAMIC LOADS, COMPUTER PROGRAM VERIFICATION, DESIGN CRITERIA, SHIP MODELS, THERMAL STRESSES, COMPUTER BENCHMARKING.

Subject Categories : Computer Programming and Software
      Marine Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE