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  • Modeling fatigue crack growth in a bimaterial specimen with the configurational forces concept
    Kolednik, Otmar ...
    A two-dimensional finite element analysis is performed to model the behavior of fatigue cracks in bimaterial specimens made of diffusion-bonded ARMCO-iron and SAE 4340 steel with an interface ... perpendicular to the crack plane. The numerical analyses are based on experiments conducted by Pippan et al. [Mater.Sci. Eng. A 283 (2000) 225-233]. The concept of configurational forces is used to evaluate by post-processing the crack-tip shielding and anti-shielding effects that occur due to the differences in yield stress, hardening and coefficients of thermal expansion of ARMCO-iron and SAE 4340 steel. For given values of applied stress intensity range ▫$/Delta$▫▫$K_{app}$▫ and applied load ratio ▫$R_{app}$▫, the near-tip J-integral ▫$J_{tip}$▫ is calculated at the maximum and minimum load. To allow for crack closure, the effective near-tip stress intensity range ▫$/Delta$▫▫$K_{eff}$▫,tip is evaluated from the near-tip stress intensity range ▫$/Delta$▫▫$K_{tip}$▫ and the near-tip load ratio ▫$R_{tip}$▫. Calibration curves for homogeneous ARMCO-iron and SAE 4340 steel are used to calculate the crack growth rate da/dN from the values of ▫$/Delta$▫▫$K_{eff,tip}$▫. The distance between interface and crack tip L is varied to simulate the behavior of a growing crack. The computed curves da/dN versus L curves are in good agreement with the experimental results.
    Vir: Materials Science & Engineering. A, Structural materials: Properties, Microstructure and Processing. - ISSN 0921-5093 (Vol. 519, iss. 1/2, 30 Aug. 2009, str. 172-183)
    Vrsta gradiva - članek, sestavni del
    Leto - 2009
    Jezik - angleški
    COBISS.SI-ID - 13328406
    DOI

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