Incorporation of UK NS94 ultimate strength analysis in MGDSA. Part I: Engineering considerations


  1. Jiang, L.
  2. Chernuka, M.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
This report presents all the engineering work related to the incorporation of an ultimate strength analysis capability in MGDSA. The various ultimate strength analysis programs developed by DREA and DERA using the ISUM method were first verified on the PC platform. The ULTMAT program was modified to accept input data at the structural component level, and the accuracy and reliability of the NS94 suite of programs were improved. In order to generate load-shortening curves for damaged stiffened panel structures through nonlinear finite element analyses, the previously developed automatic mesh generator, LSPANEL, was enhanced to include the 8-noded shell element, a corrosion modeling capability, a more realistic residual stress pattern and higher sine functions for imperfection definition. The effects of damage and other important factors on load-shortening behavior of stiffened panels were investigated using the VAST program. Input data translators between VAST and the other nonlinear FE programs, including FABSTRAN and ASAS-NL, were laso developed and verified. The detailed matheamtical formulation required for evaluating the SSCP23 limit states are presented and the method for calculating component stresses for given extreme bending moments is also included. The input data format for the updated LSPANEL program is summarized in Appendix A. TRUNCATED

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DSA (Detail Stress Analysis);Maestro Graphics - Detail Stress Analysis;Moment curvature;ULTMAT;Stiffened panels;Load shortening curve;Longitudinal strength;Hull girder strength;Ship structure
Report Number
DREA-CR-2000-112;MARTEC-TR-00-15 — Contractor Report
Date of publication
01 Mar 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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