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Visit of Prof. Sarbajit Banerjee's Group From Texas A&M University, USA
2017/06/26
Prof. Sarbajit Banerjee and his colleagues visited our group from June 25th to 29th, 2017. Prof. Banerjee also gave a presentation at the colloquium of the department on June 26th, 2017. We had an intense discussion about the coorperation of the modeling and experiments on the intelligent and energy materials.
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A model for diffusion and immobilization of Lithium in SiOC nanocomposite anodes
2017/06/07
New Publication in JOM
In order to simulate the diffusion of Li ions in SiOC nanocomposites, we developed a reaction-diffusion model for multiphase materials. This model extends existing models for single-phase diffusion through consideration of the ion transport across material interfaces. …
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TU Darmstadt Day at Tongji University, Shanghai – Workshop Functional Materials
2017/05/19
The event TU Darmstadt Day at Tongji University took place in Shanghai successfully on 19.05.2017. In the framework of TU Darmstadt Day, the bilateral workshop of Functional Materials also took place, colleagues have exchanged their current research results and discussed the possible future steps of research and collaboration in the field of materials science.
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Decomposition of Dislocation Densities at Grain Boundary in a Finite-Deformation Gradient Crystal-Plasticity Framework
2017/04/21
New Publication in the “International Journal of Plasticity”
The microscopically powerless boundaries are studied based on a finite-deformation gradient crystal-plasticity model which comprises energetic and dissipative governing components. The innovative feature in the present study includes a decomposition of dislocation densities at the boundary which provides a distinct observation of dislocation transmission through the boundary.
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Variational boundary conditions based on the Nitsche method for fitted and unfitted isogeometric discretizations of the mechanically coupled Cahn-Hilliard equation
2017/04/07
New Publication in the “Journal of Computational Physics”
The primal variational formulation of the fourth-order Cahn–Hilliard equation requires C1-continuous finite element discretizations, e.g., in the context of isogeometric analysis. In this paper, we explore the variational imposition of essential boundary conditions that arise from the thermodynamic derivation of the Cahn–Hilliard equation in primal variables.
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Enhanced electrocaloric effect near polymorphic phase boundary in lead-free potassium sodium niobate ceramics
2017/03/16
New Publication in “Applied Physics Letters”
The electrocaloric (EC) effect in lead-free (1-x)(K0.48Na0.52)(Nb0.95Sb0.05)O3-xBi0.5(Na0.82K0.18)0.5ZrO3 ceramics was investigated using an indirect thermodynamic method. Large EC temperature changes were obtained in the vicinity of a polymorphic phase boundary at 40 kV/cm, e.g., 0.32 K at 359 K for x = 0.03, 0.51 K at 350 K for x = 0.04, and 0.48 K at 300 K for x = 0.05, respectively.
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Winter school “Modeling of Functional Materials” in the framework of DFG-FOR 1509 “Ferroic functional materials”
2017/02/25
In the framework of Research Unit FOR 1509 “ Ferroic Functional Materials – Multiscale Modeling and Experimental Characterization ” funded by the German Science Foundation, the winter school Modeling of Functional Materials was held successfully at Chalet Giersch of TU Darmstadt from February 19 to 25, 2017.
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Vibration-based energy harvesting with a clamped piezoelectric circular diaphragm: analysis and identification of optimal structural parameters
2017/02/20
New Article in “Smart Materials and Structures”
Due to many potential promising applications, vibration-based piezoelectric energy harvesters (VPEH) with a clamped circular diaphragm are an intensively studied design in the field of piezoelectric energy harvesters. Nonetheless, their performance still leaves space for improvement, which is the primary target of this article.
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Experimental and computational analysis of magnetization reversal in (Nd,Dy)-Fe-B core shell sintered magnets
2017/01/30
New Publication in “Acta Materialia”
(Nd,Dy)-Fe-B core shell model magnets were prepared by co-sintering Nd-Fe-B and (Nd,Dy)-Fe-B powders. The Nd-Fe-B core and partially Dy substituted i.e. (Nd,Dy)-Fe-B shell were identified by SEM. MFM measurements of the remanent state revealed a magnetic contrast of core and shell within the same grain.
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Graduation in the Division Mechanics of functional Materials
2017/01/16
We congratulate our colleague Ying Zhao to the successful dissertation of her PhD thesis “Phase-field Modeling of Electro-chemo-mechanical Behavior of Li-ion Battery Electrodes”