CONTINUED IMPLEMENTATION OF A LARGE DISPLACEMENT CAPABILITY FOR VAST - PHASE IIB

Authors
  1. Jiang, L.
  2. Chernuka, M.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
The report describes work performed in the second year of Phase 2 in the development of a geometrically nonlinear capability in VAST. Following a survey on recent advances on solution strategies for nonlinear finite element equations, two methods, which have been identified to be superior over the Crisfield arc-length method, were implemented in VAST. New features, including the combination of multiple conservative and nonconservative load cases in nonlinear analyses, the combination of linear and nonlinear element groups and the computation of structural natural frequencies on converged equilibrium configurations, have been developed. The static contact capability of VAST has been re-established and tested. The effect of the scheme employed to define the element convected coordinate system on the accuracy and convergence speed of the present corotational formulation has been investigated. The efficiency of VAST solution algorithm for linear algebraic equations has been improved. All of the computer implementations performed under this contract have been verified by extensive numerical experimentation. The numerical example problems and their solutions are also presented in this report.
Keywords
Nonlinear;Structures
Report Number
DREA-CR-93-480;TR-93-29 — Contractor Report
Date of publication
01 Dec 1993
Number of Pages
82
DSTKIM No
94-04797
CANDIS No
144035
Format(s):
Hardcopy;Originator's fiche received by DSIS

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