Numerical simulation of the compaction process and the layer bonding with the multiscale modeling

通过多尺度建模对压实过程和层粘结进行数值模拟

• 批准号: 257819936
• 负责人: Professor Dr.-Ing. Markus Oeser
• 金额: --
• 依托单位: Lehrstuhl und Institut für Straßenwesen
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/257819936?language=en
• 关键词: Numerical; simulation; compaction; process; layer

Heavy duty transportation infrastructure requires optimal material compositions, precise construction processes and the best possible compaction to ensure sufficient durability. In the scope of the first application period for subproject 2 micro mechanical finite elements formulations for asphalt were developed to describe the material composition and the interactions between the respective material components. A fundamental understanding of mechanisms during construction and compaction processes has yet to be determined.The bonding between layers in asphalts is another prerequisite for the durability of asphalt pavements. In the first application period subprojects 1 and 4 developed the required theoretical and experimental fundamentals based on macroscopic, phenomenological formulations. The underlying mechanism of bonding due to adhesion, friction and interlocking between respective components of the material shall be investigated under application of micromechanical approaches.The results from the first application period offer all necessary prerequisites, that fundamental knowledge about the underlying mechanisms of asphalt compaction and layer bonding, that is not currently available, can be determined on a microstructure scale. In particular, this refers to results on the analysis of the microstructure of various asphalts from subprojects 2 and 3. The generated data represents the basis for micromechanical models. These models were used in subproject 2 to determine the relation between the microstructure of asphalt and the resistance against fatigue and deformation. The experimental base was established in subprojects 4 and 3. The micro-model was integrated into the macroscopic continuum mechanical FE-model of subproject 1 to allow for the analysis of entire pavement superstructures. Traffic induced loading was determined with the aid of approaches from subprojects 1, 3 and 5 under consideration of surface characteristics and chassis parameters.Precise calculations of mechanical loading in asphalt pavements and joints due to traffic can be conducted with the results from the first application period. At this point, the relationship between loading and damaging processes can be described with micromechanical processes. In the scope of the second application phase, micro- and meso-mechanical models are to be developed in subproject 2 to enhance the understanding of underlying processes during construction and compaction to ultimately allow for an optimisation of these processes by precisely influencing the asphalt microstructure and the bonding between asphalt layers in the future. Another objective in the second application phase is establishing an experimental base for a large-scale validation of the coupled models as well as transferring the uncertain material parameters from the micro into the macro scale.

重型交通基础设施需要最佳的材料成分、精确的施工工艺和最佳的压实度，以确保足够的耐久性。在子项目2的第一个应用期范围内，开发了沥青的微观力学有限元公式，以描述材料成分和各材料成分之间的相互作用。对施工和压实过程中的机理的基本认识尚未确定。沥青层与层之间的粘结是沥青路面耐久性的另一个先决条件。在第一个应用阶段，子项目1和4根据宏观现象学公式开发了所需的理论和实验基础。应在应用微观力学方法的情况下，研究由于材料各组分之间的粘附、摩擦和互锁而产生的潜在粘结机制。第一个应用阶段的结果提供了所有必要的先决条件，即目前无法获得的有关沥青压实和层粘结的潜在机制的基本知识，可以在微观结构尺度上确定。特别是，这是指对来自子项目2和3的各种沥青的微观结构的分析结果。生成的数据代表了微观力学模型的基础。这些模型被用于子项目2，以确定沥青的微观结构之间的关系，对疲劳和变形的阻力。在分项目4和3中建立了实验基地。微观模型被集成到子项目1的宏观连续力学有限元模型中，以便于分析整个路面上部结构。在考虑路面特性和底盘参数的情况下，通过子项目1、3和5的方法确定交通诱导荷载。可以使用第一个应用期的结果精确计算沥青路面和接缝中因交通引起的机械荷载。在这一点上，加载和损伤过程之间的关系可以用细观力学过程来描述。在第二个应用阶段的范围内，微观和细观力学模型将在子项目2中开发，以加强对施工和压实过程中基本过程的理解，最终通过精确影响沥青微观结构和未来沥青层之间的粘结来优化这些过程。在第二个应用阶段的另一个目标是建立一个大规模的验证耦合模型的实验基础，以及转移不确定的材料参数从微观到宏观尺度。