Session Details
MS17-1: Smart and Active Materials: Experiments, Modelling, and Simulation (Ganzes Minisymposium anzeigen)
Thursday, 12. October 2017; 10:30 - 12:30 Uhr in Raum 7.22
Sitzungsleitung: Mokarram Hossain
10:30
Constitutive modeling of shape memory alloys incorporating transformation-induced plasticity and damage (Keynote)
George Chatzigeorgiou (Arts et Métiers ParisTech, Metz), Long Cheng (Arts et Métiers ParisTech, Metz), Yves Chemisky (Arts et Métiers ParisTech, Metz), Fodil Meraghni (Arts et Métiers ParisTech, Metz)
Kurzfassung:
Shape memory alloys (SMAs) are exploited in several innovative applications such as biocompatible actuators experiencing up to large number of cyclic loads. However, the description of the SMA cyclic response is still incomplete. The present work is devoted to propose a 3D model based on the thermodynamical coupling of different strain mechanisms such as the forward and reverse phase transformation, the martensitic reorientation, the transformation-introduced plasticity and fatigue damage.
Constitutive modeling of shape memory alloys incorporating transformation-induced plasticity and damage (Keynote)
George Chatzigeorgiou (Arts et Métiers ParisTech, Metz), Long Cheng (Arts et Métiers ParisTech, Metz), Yves Chemisky (Arts et Métiers ParisTech, Metz), Fodil Meraghni (Arts et Métiers ParisTech, Metz)
Kurzfassung:
Shape memory alloys (SMAs) are exploited in several innovative applications such as biocompatible actuators experiencing up to large number of cyclic loads. However, the description of the SMA cyclic response is still incomplete. The present work is devoted to propose a 3D model based on the thermodynamical coupling of different strain mechanisms such as the forward and reverse phase transformation, the martensitic reorientation, the transformation-introduced plasticity and fatigue damage.
11:10
Bilayer Liquid Crystal and Freedericksz Instability
Krishnendu Haldar (Ecole Polytechnique), Kostas Danas (Ecole Polytechnique), Nicolas Triantafyllidis (Ecole Polytechnique)
Kurzfassung:
Liquid crystals are best known for their extensive applications, among many others, in flat display technology. The underlying mechanism is an electro-mechanical coupled phenomenon, followed by an electric field driven instability. This is also known as Freedericksz Transition (FT), where the system evolves with a new stable bifurcated configuration. In this work, through a mixed analytical/numerical study, we present the strong influences of bilayer structure and material constants on the FT.
Bilayer Liquid Crystal and Freedericksz Instability
Krishnendu Haldar (Ecole Polytechnique), Kostas Danas (Ecole Polytechnique), Nicolas Triantafyllidis (Ecole Polytechnique)
Kurzfassung:
Liquid crystals are best known for their extensive applications, among many others, in flat display technology. The underlying mechanism is an electro-mechanical coupled phenomenon, followed by an electric field driven instability. This is also known as Freedericksz Transition (FT), where the system evolves with a new stable bifurcated configuration. In this work, through a mixed analytical/numerical study, we present the strong influences of bilayer structure and material constants on the FT.
11:30
Thermo-magneto-mechanical modeling of magneto-rheological elastomers
Markus Mehnert (Friedrich-Alexander University of Erlangen-Nürnberg)
Kurzfassung:
A general thermodynamically consistent constitutive framework for thermo-magneto-mechanically coupled phenomena is devised in this contribution. A generalized formulation for the total thermo-magneto-mechanical energy function in an additive form is presented where the magneto-mechanically coupled effect is linearly scaled with the temperature. The framework is verified using a classical non-linear boundary value problem.
Thermo-magneto-mechanical modeling of magneto-rheological elastomers
Markus Mehnert (Friedrich-Alexander University of Erlangen-Nürnberg)
Kurzfassung:
A general thermodynamically consistent constitutive framework for thermo-magneto-mechanically coupled phenomena is devised in this contribution. A generalized formulation for the total thermo-magneto-mechanical energy function in an additive form is presented where the magneto-mechanically coupled effect is linearly scaled with the temperature. The framework is verified using a classical non-linear boundary value problem.
11:50
Continuum Mechanical Modeling of Strain-Induced Crystallization in Polymers
Serhat Aygün (TU Dortmund University), Sandra Klinge (TU Dortmund University), Sanjay Govindjee (University of California)
Kurzfassung:
The strain-induced crystallization (SIC) in polymers is a phenomenon manifesting itself as the natural reinforcement caused by the high deformation. The current presentation, treats a polymer affected by the SIC as a heterogeneous medium consisting of regions with a different degree of network regularity. Such a concept allows us to simulate the nucleation and the growth of crystalline regions. The model proposed is based on the assumptions for the free energy and dissipation potential.
Continuum Mechanical Modeling of Strain-Induced Crystallization in Polymers
Serhat Aygün (TU Dortmund University), Sandra Klinge (TU Dortmund University), Sanjay Govindjee (University of California)
Kurzfassung:
The strain-induced crystallization (SIC) in polymers is a phenomenon manifesting itself as the natural reinforcement caused by the high deformation. The current presentation, treats a polymer affected by the SIC as a heterogeneous medium consisting of regions with a different degree of network regularity. Such a concept allows us to simulate the nucleation and the growth of crystalline regions. The model proposed is based on the assumptions for the free energy and dissipation potential.