Lifetime Reliability Estimate and Extreme Permanent Deformations of Randomly Excited Elasto-Plastic Structures

Søren R.K. Nielsen, John Dalsgaard Sørensen, Palle Thoft-Christensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A method is presented for life-time reliability' estimates of randomly excited yielding systems, assuming the structure to be safe, when the plastic deformations are confined below certain limits. The accumulated plastic deformations during any single significant loading history are considered to be the outcome of identically distributed, independent stochastic variables,for which a model is suggested. Further assuming the interarrival times of the elementary loading histories to be specified by a Poisson process, and the duration of these to be small compared to the designed life-time, the accumulated plastic deformation during several loadings can be modelled as a filtered Poisson process. Using the Markov property of this quantity the considered first-passage problem as well as the related extreme distribution problems are then solved numerically, and the results are compared to simulation studies.
Original languageEnglish
JournalReliability Engineering & System Safety
Volume4
Issue number2
Pages (from-to)85-103
Number of pages19
ISSN0951-8320
DOIs
Publication statusPublished - 1983

Keywords

  • Lifetime Reliability
  • Elasto-Plastic Structures
  • Permanent Deformations

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