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An investigation of distortion-induced fatigue cracking under variable amplitude loading using 3D crack propagation analysis

Mustafa Aygül (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Mohammad Al-Emrani (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Z. Barsoum ; J. Leander
Engineering Failure Analysis (1350-6307). Vol. 45 (2014), p. 151-163.
[Artikel, refereegranskad vetenskaplig]

The distortion-induced fatigue cracks in the welded details of the Soderstrom Bridge are analytically and numerically investigated by performing 3D crack propagation analyses with variable amplitude fatigue loading. In the crack propagation analyses, the effects of bridge loading are defined on the basis of the field measurements in order to simulate crack growth and predict the residual fatigue life of the studied detail as accurately as possible. The effect of crack closure and crack direction while considering the most common criteria is also studied. The results are compared with those obtained from the crack propagation analyses with constant amplitude fatigue loading presented in Ayg l et al. [1]. The results of the crack growth simulations with variable amplitude fatigue loading have generally shown good agreement with the real crack formation and reveal that the crack growth rates are different in different directions. The crack behaviour in the damaged detail is mainly controlled by the loading and geometrical arrangement of the detail components. There is generally a significant difference between constant and variable amplitude fatigue crack growth analyses and the variable amplitude fatigue crack growth analyses yield more conservative results. The main reason for this difference is the bridge loading and the number of stress cycles defined in the analyses. The crack direction criteria studied in this investigation showed basically the same crack formation and crack growth rate.

Nyckelord: Distortion-induced fatigue cracking, Out-of-plane distortion, Variable amplitude loading, Crack propagation analysis, Mixed-mode conditions



Denna post skapades 2014-11-05. Senast ändrad 2015-03-30.
CPL Pubid: 205309

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Konstruktionsteknik

Ämnesområden

Materialteknik

Chalmers infrastruktur