Some industrial applications for nanocomposites under mechanical and environmental loading

机械和环境载荷下纳米复合材料的一些工业应用

• 批准号: 446630013
• 负责人: Professor Dr.-Ing. Wilfried Becker
• 金额: --
• 依托单位: Fachgebiet Strukturmechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/446630013?language=en
• 关键词: Some; industrial; applications; nanocomposites; under

The main idea pursued in the project proposal is to continue investigations of the graphene or carbon nanotube placed over a polymer (metal, cement) matrix nanocomposites in the frame of 2D analytical stress-function variational method and to develop it for hygro-thermal-mechanical loading of nanocomposites and devices. Such results will be applied to estimate the influence of the environmental excitation on the interface behavior of some industrial devices. The Illustrative numerical examples will be presented in figures and discussed. Some parametric analysis will be done. The research objectives can be summarized as follows:Development of the 2D elastic problem for a representative volume element (RVE) of a nanocomposite device under thermal, moisture and mechanical loading. Derivation from the variational principle for a minimum of the complementary strain energy functional a 4th order ODE about axial stress of the graphene flake and presentation of all stresses in RVE as functions of the solution, its first and second derivatives. Under proper criterion the interface delamination will be found and discussed in detail, taking into account the influence of thermal and mechanical loading. Research and computational methodology• Under some idealizing assumptions all stresses (axial, shear and peel) of the chosen nanostructure under hygro-thermal-mechanical loading have to be expressed by one single stress potential function. The solution of the variational problem for minimization of complementary strain energy functional will lead to one ordinary differential equation of 4th order about the potential function.The solution of the boundary value problem for last equation must be found to determine and discuss all stresses in the layers.• The 2D stress function variational method will be applied to consider hygrothermalmechanical behaviour of some nanodevices, textile and cement nanocomposites to estimate the appearance of a possible interface delamination due to the excitation of combined loading.• Next, detailed studies and illustration in figures on the possible interface delamination, according to the chosen criterion has to be done. Further it is expected that some parametric analysis of the influence of the loading and geometric characteristics of the structure on the interface debond length will be investigated in details. The aid provided by the host institution with experimental data will also be valuable in this aspect.

项目提案中追求的主要思想是继续研究石墨烯或碳纳米管放置在聚合物（金属，水泥）基质纳米复合材料的框架中的二维分析应力函数变分法，并将其开发为纳米复合材料和设备的湿热机械载荷。这些结果将被应用于估计环境激励对一些工业设备的界面行为的影响。说明性的数值示例将在图中呈现并讨论。将进行一些参数分析。研究目标可以概括如下：发展的二维弹性问题的一个代表性的体积元（RVE）的纳米复合材料设备下的热，水分和机械载荷。从关于石墨烯薄片的轴向应力的互补应变能泛函的最小值的变分原理导出关于石墨烯薄片的轴向应力的4阶ODE，并且将RVE中的所有应力表示为解、其一阶导数和二阶导数的函数。在适当的准则下，考虑到热载荷和机械载荷的影响，将发现并详细讨论界面分层。研究和计算方法 在一些理想化的假设下，所选纳米结构在湿热机械载荷下的所有应力（轴向、剪切和剥离）必须由一个单一的应力势函数表示。求解最小余应变能泛函的变分问题，将导出一个关于势函数的四阶常微分方程，为了确定和讨论各层的应力，必须求出最后一个方程的边值问题的解。 二维应力函数变分法将被应用于考虑一些纳米器件、纺织品和水泥纳米复合材料的湿热力学行为，以估计由于组合载荷的激发而可能出现的界面分层。· 接下来，必须根据所选标准对可能的界面分层进行详细研究和图示。此外，预计将详细研究结构的载荷和几何特性对界面脱粘长度的影响的一些参数分析。东道机构提供的实验数据援助在这方面也很有价值。