The finite-element method, which has been applied to non-conservative stability problems in structures in recent years, permits the determination of critical loads for systems where no differential equation can be considered as valid over the entire range (e.g., beams on elastic or rigid intermediate supports). The Authors (of, respectively, Flender Werft AG and Thyssen Nordseewerke GmbH) show how non-conservative stability problems can be treated with a set of "analytical" finite elements, in which the assumed displacement function exactly satisfies the differential equation. The non-conservative loads are easily included in the usual stiffness matrix of the total system. Results obtained emphasise the need for taking non-conservative critical loads into account where these occur, since they may be considerably lower than the conservative ones. it is mentioned that, owing to the increasing use of higher tensile steels, it can in general be expected that a number of ship structures will become stability-critical rather than stress-critical, so that methods for the precise determination of instability phenomena will be more important in future.

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    International Periodical Press

    193 Heemraadssingel
    Rotterdam,   Netherlands 
  • Authors:
    • Lehmann, E
    • Fricke, W
  • Publication Date: 1978-5

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Filing Info

  • Accession Number: 00182484
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM