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Characterization of Load Sensitive Fatigue Crack Initiation in Ti-Alloys Using Crystal Plasticity Based FE Simulations

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Advanced Materials Modelling for Structures

Part of the book series: Advanced Structured Materials ((STRUCTMAT,volume 19))

Abstract

Fatigue life in near \(\alpha \) Ti-alloys shows large variation with characteristics of applied load and is due to the microstructurally dependent deformation behavior in these alloys. In the present work, the load sensitive fatigue crack nucleation behavior is investigated using a physically motivated crack initiation law and cyclic crystal plasticity based finite element (CPFE) simulations of statistically equivalent image based microstructures. Since cyclic CPFE simulation for large number of cycles using conventional time integration schemes is computationally prohibitive, a wavelet transformation based multi-time scale (WATMUS) method developed in [1, 2] is used in the present work to perform accelerated simulations. To predict cycles to nucleation, a physically motivated crack nucleation model based on crystal plasticity variables developed in [3] has been used in this work. The nucleation model is calibrated and validated with experiments. The sensitivity of crack nucleation to the characteristics of the applied load is studied by performing WATMUS method based CPFE simulations for different cyclic load profiles on a statistically equivalent microstructure.

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Authors and Affiliations

  1. The Ohio State University, Columbus, OH-43201, USA

    P. Chakraborty

  2. Johns Hopkins University, Baltimore, MD-21218, USA

    S. Ghosh

Authors
  1. P. Chakraborty
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  2. S. Ghosh
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Correspondence to P. Chakraborty .

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Editors and Affiliations

  1. Lehrstuhl für Technische Mechanik, Institut für Mechanik, Universitätsplatz 2, Magdeburg, 39106, Germany

    Holm Altenbach

  2. ONERA / DMSM, av. Division Leclerc 29, Chatillon Cedex, 92322, France

    Serge Kruch

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Chakraborty, P., Ghosh, S. (2013). Characterization of Load Sensitive Fatigue Crack Initiation in Ti-Alloys Using Crystal Plasticity Based FE Simulations. In: Altenbach, H., Kruch, S. (eds) Advanced Materials Modelling for Structures. Advanced Structured Materials, vol 19. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35167-9_10

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