Abstract
Qualitative and quantitative studies are made emphasizing the concept of damage-induced anisotropy using the micromechanical model proposed shown in Chap. 11, “Ductile Damage Behavior in Low-Cycle Fatigue for Polycrystalline Metallic Materials.” The model deals with the plastic strain and local damage variables. In fact, they are examined at the crystallographic slip scale for FCC metallic polycrystals. The elastic behavior is initially assumed to be compressible and isotropic determined at the macroscopic scale. Due to the activation/deactivation concept, the anisotropic damaged behavior is adopted using a fourth-order damage tensor at the overall scale. Consequently, the overall nonlinear behavior, notably the deactivation phase due to microcracks closure under complex cyclic loadings, is of particular interest in this chapter.
The model ability is demonstrated by a host of plastic predicted damaged behaviors of metallic polycrystals focusing on the unilateral damage and loading path effects on the multiaxial low-cycle fatigue (LCF) behavior. Actually, the model is tested under strain- and stress-controlled conditions describing the effects of the loading path complexity and the mean stress on the polycrystal LCF behavior. Finally, the model can successfully describe the LCF behavior of the Waspaloy at room temperature.
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Acknowledgments
This is certainly not a classical acknowledgments, nonetheless it is in memory of a friend and ex-Ph.D. student Blondin Mounounga, since a part of the present effort has been developed with him.
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Abdul-Latif, A. (2015). Numerical Applications in Damage Induced Anisotropy in Low-Cycle Fatigue Modeling for Metals. In: Voyiadjis, G. (eds) Handbook of Damage Mechanics. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5589-9_43
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DOI: https://doi.org/10.1007/978-1-4614-5589-9_43
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