TP3: Microstructure-based modelling of adiabatic shear band formation in high-speed blanking processes

TP3：高速冲裁过程中绝热剪切带形成的基于微观结构的建模

• 批准号: 506489227
• 负责人: Dr.-Ing. Alexander Butz
• 金额: --
• 依托单位: Fraunhofer-Institut für Werkstoffmechanik (IWM)
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/506489227?language=en
• 关键词: TP3; Microstructure; based; modelling; adiabatic

The sub-project TP3 is based on the work hypothesis that the experimentally observable interactions between high-speed blanking process, microstructure of the material and the adiabatic shear band (ASB) formation can be described by suitable mechanism-based numerical modelling approaches. Such models are considered as valuable tools to analyse and better understand the fundamental phenomena on the microstructure scale of the material during ASB formation. By close collaboration with the other sub-projects it is expected that a deeper knowledge of the microstructure-property relations during high-speed blanking can be obtained.The focus of this sub-project (TP3) is on the microstructure-based modelling and simulation of adiabatic shear band formation during high-speed blanking. Thermomechanical and microstructure-based modelling strategies as well as experimental results from other subprojects will be taken into consideration to better understand the phenomena leading to ASB formation. The development, implementation and validation of a numerical model and the systematic numerical analysis of the interaction between the material microstructure, process parameters and ASB formation at the polycrystal length scale using mechanism-based modelling strategies are the major aim of TP3.Three work packages are planned for the model development: In WP1, the initiation and propagation of ASB within a polycrystal will be investigated using the full-field crystal plasticity finite element method. In WP2, the development of sub-grains and/or phase transformation in the microstructure within the ASB will be explored using mean-field modelling techniques. In WP3, the final stage of the high-speed blanking process, namely material separation, is modelled using a ductile damage coupled crystal plasticity material model. In WP4, the methods established in the first three work packages will be validated and evaluated using the experimental results from other sub-projects. In addition to the experimental works in other sub-projects, the mechanical properties of ASBs and their surroundings will be characterized individually using micro-tensile experiments. The modelling approaches developed in TP3 will contribute to an integrated modelling strategy in collaboration with the other sub-projects and support the material-specific design of high-speed blanking.

TP3子项目的工作假设是，实验观察到的高速下料过程、材料微观结构和绝热剪切带（ASB）形成之间的相互作用可以用合适的基于机制的数值模拟方法来描述。这些模型被认为是分析和更好地理解ASB形成过程中材料微观结构尺度基本现象的有价值的工具。通过与其他子项目的密切合作，预计可以更深入地了解高速冲裁过程中的微观组织-性能关系。该子项目（TP3）的重点是高速下料过程中绝热剪切带形成的基于微观结构的建模和模拟。为了更好地理解导致ASB形成的现象，将考虑基于热力学和微观结构的建模策略以及其他子项目的实验结果。TP3的主要目标是开发、实施和验证一个数值模型，并使用基于机理的建模策略对材料微观结构、工艺参数和多晶长度尺度上ASB形成之间的相互作用进行系统的数值分析。模型开发计划有三个工作包：在WP1中，将使用全场晶体塑性有限元法研究多晶中ASB的产生和传播。在WP2中，将使用平均场建模技术探索ASB内微观结构中亚晶粒和/或相变的发展。在WP3中，高速下料过程的最后阶段，即材料分离，采用韧性损伤耦合晶体塑性材料模型进行建模。在WP4中，将使用其他子项目的实验结果验证和评估前三个工作包中建立的方法。除了其他子项目的实验工作外，asb及其周围环境的力学性能将通过微拉伸实验进行单独表征。在TP3中开发的建模方法将有助于与其他子项目合作的综合建模策略，并支持高速下料的特定材料设计。