Simulation of Stochastic Loads for Fatigue Experiments

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Resumé

A simple direct simulation method for stochastic fatigue load generation is described in this paper. The simulation method is based on the assumption that only the peaks of the load process significantly affect the fatigue life. The method requires the conditional distribution functions of load ranges given the last peak values. Analytical estimates of these distribution functions are presented in the paper and compared with estimates based on a more accurate simulation method. In the more accurate simulation method samples at equidistant times are generated by approximating the stochastic load process by a Markov process. Two different spectra from two tubular joints in an offshore structure (one narrow banded and one wide banded) are considered in an example. The results show that the simple direct method is quite efficient and is results in a simulation speed at about 3000 load cycles per second using an IBM PC. Finally the proposed simulation method for fatigue load generation is tested by comparing some fatigue damage measures obtained by the simulation methods.
OriginalsprogEngelsk
Udgivelses stedAalborg
ForlagDept. of Building Technology and Structural Engineering, Aalborg University
Antal sider24
StatusUdgivet - 1987
NavnStructural Reliability Theory
Nummer31
Vol/bindR8717
ISSN0902-7513

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Fatigue of materials
Distribution functions
Experiments
Offshore structures
Fatigue damage
Markov processes

Bibliografisk note

PDF for print: 29 pp.

Emneord

  • Stochastic Fatigue Load Generation
  • Loadings
  • Loads
  • Stochastic Loads

Citer dette

Sørensen, J. D., & Brincker, R. (1987). Simulation of Stochastic Loads for Fatigue Experiments. Aalborg: Dept. of Building Technology and Structural Engineering, Aalborg University. Structural Reliability Theory, Nr. 31, Bind. R8717
Sørensen, John Dalsgaard ; Brincker, Rune. / Simulation of Stochastic Loads for Fatigue Experiments. Aalborg : Dept. of Building Technology and Structural Engineering, Aalborg University, 1987. 24 s. (Structural Reliability Theory; Nr. 31, Bind R8717).
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abstract = "A simple direct simulation method for stochastic fatigue load generation is described in this paper. The simulation method is based on the assumption that only the peaks of the load process significantly affect the fatigue life. The method requires the conditional distribution functions of load ranges given the last peak values. Analytical estimates of these distribution functions are presented in the paper and compared with estimates based on a more accurate simulation method. In the more accurate simulation method samples at equidistant times are generated by approximating the stochastic load process by a Markov process. Two different spectra from two tubular joints in an offshore structure (one narrow banded and one wide banded) are considered in an example. The results show that the simple direct method is quite efficient and is results in a simulation speed at about 3000 load cycles per second using an IBM PC. Finally the proposed simulation method for fatigue load generation is tested by comparing some fatigue damage measures obtained by the simulation methods.",
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Sørensen, JD & Brincker, R 1987, Simulation of Stochastic Loads for Fatigue Experiments. Structural Reliability Theory, nr. 31, bind R8717, Dept. of Building Technology and Structural Engineering, Aalborg University, Aalborg.

Simulation of Stochastic Loads for Fatigue Experiments. / Sørensen, John Dalsgaard; Brincker, Rune.

Aalborg : Dept. of Building Technology and Structural Engineering, Aalborg University, 1987. 24 s. (Structural Reliability Theory; Nr. 31, Bind R8717).

Publikation: Bog/antologi/afhandling/rapportRapportForskningpeer review

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Sørensen JD, Brincker R. Simulation of Stochastic Loads for Fatigue Experiments. Aalborg: Dept. of Building Technology and Structural Engineering, Aalborg University, 1987. 24 s. (Structural Reliability Theory; Nr. 31, Bind R8717).