Finite element simulation of PSB macroband nucleation and propagation in single crystal nickel cycled at low plastic strain amplitudes |
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| Institution: | 1. Institute of Mechanics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany;2. Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156 Milan, Italy;1. Civil Engineering, Johns Hopkins University, USA;2. Civil, Mechanical and Material Science & Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA;1. Research Scholar, College of Engineering Pune, Maharashtra and 411005, India;2. Associate Professor, College of Engineering Pune, Maharashtra and 411005, India;1. State Key Laboratory for Turbulence and Complex System, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, PR China;2. HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, PR China;3. State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, PR China;4. Department of Mechanics, College of Sciences, Shanghai 200444, PR China;5. State Key Laboratory for Mechanical behavior of Materials, Xi’an 710049, PR China |
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| Abstract: | Substructure models for vein matrix and persistent slip band (PSB) structures are extracted from a uniaxial mixtures model that was developed to simulate cyclic loading experiments on nickel single crystals oriented for single slip. Reverse magnetostriction is included as well. These substructure models are implanted in a single crystal plasticity framework with fully anisotropic elasticity. The resulting constitutive models are incorporated in finite element models to simulate the process of PSB macroband formation and propagation. Perturbation elements (PEs), elements assigned with PSB properties, are used as the loci for PSB macroband nucleation. Transition of elements with vein matrix properties to elements with PSB properties is triggered at integration points by a shear stress criterion applied on slip systems. The resulting finite element models successfully demonstrate the process of PSB formation and propagation, and plastic strain amplitude partitioning between vein matrix and PSB macrobands. The effect of model boundary constraints, strain increment dependence, mesh sensitivity, PE distribution, specimen axis misorientation, and PSB volume fraction generated is examined. |
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