AN EXAMPLE OF OBTAINING DETAILED STRESSES OF A PORTION OF A MAESTRO MODEL OF A SHIP STRUCTURE BY BOTTOM-UP AND TOP-DOWN ANALYSIS USING MAESTRO MG/DSA

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Authors
  1. Smith, D.R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Smith (D R), Halifax NS (CAN)
Abstract
The report describes the method and results of a detailed analysis of a portion of a ship structure modelled by MAESTRO using bottom-up and top-down analyses. For the bottom-up method, a MAESTRO analysis of the structure was carried out to identify high stress regions. These regions were then modeled in detail using the program MAESTRO MG/DSA. The detail was created as a MAESTRO superelement. The superelement was automatically statically condensed and inserted into the original MAESTRO model equilibrium equations replacing the identified MAESTRO elements. A MAESTRO analysis of the modified model using the same loading and boundary conditions as the original model, was run and detailed displacements and stresses were obtained using the superelement feature of the finite element program VAST. For the top-down analysis, the detail model created for the superelement was used as a stand-alone model. The displacements from the initial MAESTRO analysis were applied to the stand-alone model as boundary conditions and a finite element analysis using VAST was carried out. The results of the three analyses were compared. They showed that a much better definition of the local stress condition was obtained with the detail model than by MAESTRO alone, with little difference in the results between the bottom-up and the top-down methods.
Keywords
Superelement;Analysis Evaluation;Structural Optimization;(MAESTRO)
Report Number
DREA-CR-95-500 — Contractor Report
Date of publication
01 Dec 1995
Number of Pages
41
DSTKIM No
96-02066
CANDIS No
498675
Format(s):
Document Image stored on Optical Disk;Hardcopy

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