Stochastic modeling of fatigue crack propagation

Author

Ray, Asok ; Tangirala, Sekhar

Author_Institution

Dept. of Mech. Eng., Pennsylvania State Univ., University Park, PA, USA

Volume

1

fYear

1997

fDate

4-6 Jun 1997

Firstpage

425

Abstract

This paper presents a stochastic model of fatigue-induced crack propagation in metallic materials. The crack growth rate predicted by the model is guaranteed to be non-negative. The model structure is built upon the underlying principle of Karhunen-Loeve expansion and does not require solutions of stochastic differential equations in either Wiener integral or Ito integral setting. As such this crack propagation model can be readily adapted to damage monitoring and remaining life prediction of stressed structures. The model results have been verified by comparison with experimental data of time-dependent fatigue crack statistics for 2024-T3 and 7075-T6 aluminum alloys

Keywords

aluminium alloys; copper alloys; crack-edge stress field analysis; fatigue cracks; magnesium alloys; modelling; stochastic processes; zinc alloys; Al-Cu-Mg; Al-Cu-Mg alloy; Al-Zn-Mg; Al-Zn-Mg alloy; Ito integral setting; Karhunen-Loeve expansion; Wiener integral; crack growth rate; crack propagation model; damage monitoring; fatigue-induced crack propagation; metallic materials; model structure; remaining life prediction; stochastic model; stressed structures; time-dependent fatigue crack statistics; Aluminum alloys; Differential equations; Fatigue; Indium tin oxide; Inorganic materials; Integral equations; Monitoring; Predictive models; Statistics; Stochastic processes;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 1997. Proceedings of the 1997

Conference_Location

Albuquerque, NM

ISSN

0743-1619

Print_ISBN

0-7803-3832-4

Type

conf

DOI

10.1109/ACC.1997.611833

Filename

611833