On nonlinear thermo-electro-mechanics in the context of electro-active polymers

电活性聚合物背景下的非线性热机电力学

• 批准号: 246833458
• 负责人: Professor Dr.-Ing. Paul Steinmann
• 金额: --
• 依托单位: Lehrstuhl für Technische Mechanik (LTM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246833458?language=en
• 关键词: nonlinear; thermo; electro; mechanics; context

The ever increasing demand for functional materials while simultaneously assuring low production costs has led to a strong focus on smart materials in the past two decades. Prominent examples of this class of materials are electro-active polymers that can change their form and mechanical properties due to external stimulation by an applied electric field.As a result of the high electric voltages that are needed to induce the electric field but also due to other external influences during the application of electro-active polymers, significant changes in the temperature of the material may occur. Therefore it is crucial to consider these thermal influences on the material behavior as well. Thus in the first phase of this project the basics of the coupled thermo-electro-mechanical problem were developed and solved using both analytical and numerical methods.In the second phase of this project we initially aim to conduct experimental investigations on various (rate-dependent) electro-active materials. To this end we will extend the testing equipment that is available at the Chair of Applied Mechanics of the University Erlangen-Nuremberg. The results of these tests will be used to validate the theoretical framework that was developed in the first phase of this project. In the experiments two types of electro-active materials will be tested. We will use the commercially available material VHB 4910 and a silicone, filled with piezoactive particles, that is custom made and provided for our experiments by the Chair of Polymeric Materials at the University Erlangen-Nuremberg.Subsequently the validated numerical implementation will be used to analyze the influence of a number of internal and external effects on the material. We will investigate for example how the free space surrounding a material sample influences the results of the numerical simulation. Furthermore the role of the microstructure of the material will be investigated in more detail. For this we will introduce two different scales on which the material is observed. This will include the microscale where the exact microscopic structure of the material is depicted and the macroscale where the material is considered to be homogeneous. The formulation of a scale transition between the micro- and the macroscale will eventually lead to a more realistic description of the material behavior. This is especially important for materials for which the internal structure cannot be considered to be homogeneous. This is for example the case for the particle filled silicone composite used in the experiments. Finally a novel formulation for the driving forces at defects in the material will be established. Thereby, with respect to electro-active polymers, the piezoactive particles in the silicone composite can be considered as such defects.

在过去的二十年中，对功能材料的需求不断增长，同时确保低生产成本的需求使人们强烈关注智能材料。这类材料的突出例子是电活性聚合物，由于施加的电场外部刺激而导致其形式和机械性能。由于高电压的结果是诱导电场所需的高电压，但由于在电动聚合物的应用过程中施加了其他外部影响，因此可能会导致材料温度的显着变化。因此，考虑这些热影响物质行为至关重要。因此，在该项目的第一阶段中，使用分析方法和数值方法开发并解决了耦合热机电问题的基础。为此，我们将扩展在Erlangen-Nurember大学应用机制主席上可用的测试设备。这些测试的结果将用于验证该项目第一阶段开发的理论框架。在实验中，将测试两种类型的电动材料。 我们将使用商业上可用的材料VHB 4910和一个充满压电颗粒的有机硅，这些硅是由大学Erlangen-Nuremberg的Polymeric Materials主席定制并为我们提供的实验，并将经过验证的数值实施用于分析材料对内部和外部效果的影响。例如，我们将研究材料样品周围的自由空间如何影响数值模拟的结果。此外，将更详细地研究材料微观结构的作用。为此，我们将引入两个不同的尺度，观察到材料。这将包括描绘材料的精确显微镜结构的显微镜以及材料被认为是均匀的宏观。微观和宏观之间的量表过渡的表述最终将导致对物质行为的更现实描述。这对于不能认为内部结构是均匀的材料尤其重要。例如，这是实验中使用的颗粒填充的硅胶复合材料的情况。最终，将建立一种材料缺陷的驱动力的新表述。因此，对于电活性聚合物，有机硅复合材料中的压电颗粒可以视为这种缺陷。

项目成果

Numerical modeling of thermo-electro-viscoelasticity with field-dependent material parameters

• DOI: 10.1016/j.ijnonlinmec.2018.08.016
• 发表时间: 2018-11-01
• 期刊: INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
• 影响因子: 3.2
• 作者: Mehnert, Markus;Hossain, Mokarram;Steinmann, Paul
• 通讯作者: Steinmann, Paul

Numerical modelling of nonlinear thermo-electro-elasticity

• DOI: 10.1177/1081286517729867
• 发表时间: 2017-11-01
• 期刊: MATHEMATICS AND MECHANICS OF SOLIDS
• 影响因子: 2.6
• 作者: Mehnert, Markus;Pelteret, Jean-Paul;Steinmann, Paul
• 通讯作者: Steinmann, Paul

Towards a thermo-magneto-mechanical coupling framework for magneto-rheological elastomers

• DOI: 10.1016/j.ijsolstr.2017.08.022
• 发表时间: 2017-12
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: M. Mehnert;M. Hossain;P. Steinmann

On the influence of the compliant electrodes on the mechanical behavior of VHB 4905

• DOI: 10.1016/j.commatsci.2019.01.011
• 发表时间: 2019-04-01
• 期刊: COMPUTATIONAL MATERIALS SCIENCE
• 影响因子: 3.3
• 作者: Mehnert, Markus;Steinmann, Paul
• 通讯作者: Steinmann, Paul

On nonlinear thermo-electro-elasticity

• DOI: 10.1098/rspa.2016.0170
• 发表时间: 2016-06-01
• 期刊: PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
• 影响因子: 3.5
• 作者: Mehnert, Markus;Hossain, Mokarram;Steinmann, Paul
• 通讯作者: Steinmann, Paul