Characterization and modeling of the laser-based separation process and resulting damage mechanisms of carbon fiber reinforced plastics under fatigue loading

疲劳载荷下碳纤维增强塑料的激光分离过程及其损伤机制的表征和建模

• 批准号: 436398518
• 负责人: Dr.-Ing. Peter Jäschke
• 金额: --
• 依托单位: Lehrstuhl für Werkstoffprüftechnik
• 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 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/436398518?language=en
• 关键词: Characterization; modeling; laser; based; separation

The aim of the research project is the simulation development for the determination of temperature fields in laser processing, characterization of their effects on the damage development, and the damage mechanisms of carbon fiber reinforced plastics (CFRP) under cyclic loading. For this purpose, unidirectional (UD) CFRP with various matrix materials, thermoset epoxy resin (EP) and thermoplastic polyamide 6.6 (PA) will be produced and cut by means of laser processing. The material to be separated evaporates in the laser beam focus, generating thermally induced damage referred to as heat affected zones (HAZ). To determine the mechanical characteristics, with superimposed mechanical-thermal stress, fatigue tests are carried out. Integrated fiber Bragg grating (FBG) sensor, as well as thermocouples, provide the basis for temperature and strain measurement during laser processing and mechanical testing. In order to obtain conclusions about CFK damage mechanisms, in a further step intermittent in-situ computed tomography (CT) investigations are performed and correlated with the previous results. In combination with the experimental investigations, a simulation will be developed which describes the machining process in terms of intensity, speed and material removal depending on the material used and the laminate structure and predicts the resulting temperature fields during the processing of the finished component. On the basis of these data, the characteristics of the HAZ should be determined. By parallel verification of the results by means of experiments, the simulation is iteratively optimized.

该研究项目的目的是在激光加工中的温度场的测定，表征其对损伤发展的影响，以及在循环载荷下的碳纤维增强塑料（CFRP）的损伤机制的模拟开发。为此，将通过激光加工生产和切割具有各种基体材料、热固性环氧树脂（EP）和热塑性聚酰胺6.6（PA）的单向（UD）CFRP。待分离的材料在激光束焦点处蒸发，产生热致损伤，称为热影响区（HAZ）。为了确定机械特性，在叠加机械-热应力的情况下，进行疲劳试验。集成光纤布拉格光栅（FBG）传感器以及热电偶为激光加工和机械测试期间的温度和应变测量提供了基础。为了获得CFK损伤机制的结论，在进一步的步骤间歇性原位计算机断层扫描（CT）的调查进行，并与以前的结果。结合实验研究，将开发一种模拟，根据所用材料和层压结构的强度，速度和材料去除来描述加工过程，并预测成品部件加工过程中产生的温度场。根据这些数据，应确定热影响区的特性。通过实验对结果进行并行验证，对仿真进行迭代优化。