A Variational Constitutive Model of Void Growth in Single and Polycrystals Application to Ultrafine Grained and Nanocrystalline Materials



A Variational Constitutive Model for Void Growth in Crystals Application to Nanocrystals
Gürses, Ercan (null; 2010-05-21)
A variational multiscale constitutive model for nanocrystalline materials
Gürses, Ercan (Elsevier BV, 2011-03-01)
This paper presents a variational multi-scale constitutive model in the finite deformation regime capable of capturing the mechanical behavior of nanocrystalline (nc) fcc metals. The nc-material is modeled as a two-phase material consisting of a grain interior phase and a grain boundary effected zone (GBAZ). A rate-independent isotropic porous plasticity model is employed to describe the GBAZ, whereas a crystal-plasticity model which accounts for the transition from partial dislocation to full dislocation m...
A phase-field model for chemo-mechanical induced fracture in lithium-ion battery electrode particles
MIEHE, C.; Dal, Hüsnü; SCHAENZEL, L. -M.; RAINA, A. (2016-06-01)
Capacity fade in conventional Li-ion battery systems due to chemo-mechanical degradation during charge-discharge cycles is the bottleneck in high-performance battery design. Stresses generated by diffusion-mechanical coupling in Li-ion intercalation and deintercalation cycles, accompanied by swelling and shrinking at finite strains, cause micro-cracks, which finally disturb the electrical conductivity and isolate the electrode particles. This leads to battery capacity fade. As a first attempt towards a reli...
A macroscopic model for self-organized aggregation in swarm robotic systems
Soysal, Onur; Şahin, Erol (2006-10-01)
We study the self-organized aggregation of a swarm of robots in a closed arena. We assume that the perceptual range of the robots are smaller than the size of the arena and the robots do not have information on the size of the swarm or the arena. Using a probabilistic aggregation behavior model inspired from studies of social insects, we propose a macroscopic model for predicting the final distribution of aggregates in terms of the parameters of the aggregation behavior, the arena size and the sensing chara...
GÜLTEKİN, Osman; Dal, Hüsnü; HOLZAPFEL, Gerhard A (2016-06-10)
This study uses a recently developed phase-field approach to model fracture of arterial walls with an emphasis on aortic tissues. We start by deriving the regularized crack surface to overcome complexities inherent in sharp crack discontinuities, thereby relaxing the acute crack surface topology into a diffusive one. In fact, the regularized crack surface possesses the property of Gamma-Convergence, i.e. the sharp crack topology is restored with a vanishing length-scale parameter. Next, we deal with the con...
Citation Formats
E. Gürses, “A Variational Constitutive Model of Void Growth in Single and Polycrystals Application to Ultrafine Grained and Nanocrystalline Materials,” 2010, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/81056.