Multi-scale simulation and analysis of process-induced thermo-chemical phenomena during the curing of thick-walled thermoset fibre composite laminates

厚壁热固性纤维复合材料层压板固化过程中过程引起的热化学现象的多尺度模拟与分析

• 批准号: 530751617
• 负责人: Professor Dr.-Ing. Christian Hopmann
• 金额: --
• 依托单位: Institut für Kunststoffverarbeitung (IKV) in Industrie und Handwerk an der RWTH Aachen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/530751617?language=en
• 关键词: Multi; scale; simulation; analysis; process

In the proposed research project, the process-dependent material behaviour of thick-walled thermoset fibre-reinforced plastics (FRPs) with continuous fibre reinforcement is to be analysed for the first time during the curing and cooling process, taking into account time- and spatially-resolved changes in the degree of cure. The applicant pursues the approach of describing the thermo-chemical phenomena that occur and the temperature equalisation processes inside the FRP in their entirety to develop an appropriate and efficient modelling and homogenisation strategy based on this for transferability to laminate and multilayer composites. The project's overall objective is the realistic and cross-scale prediction of the temperature equalisation processes occurring during the processing of thick-walled thermoset FRPs, taking complete account of cross-linking and temperature-dependent material characteristics. The time and spatially resolved temperature and curing degree distribution in a thick-walled FRP laminate are simulated, starting immediately after the fibre impregnation process up to the complete cooling process. Based on validation tests, it is to be shown that the developed macro-model can be used to precisely describe the temperature and curing degree distribution in thick-walled laminates. Furthermore, by linking the developed thermo-chemical model with an existing cross-link-dependent thermo-viscoelastic material model, a mechanistic model for FRP will be developed, which precisely describes the residual stress development on RVE level. By linking temperature compensation processes with thermo-chemical phenomena during the curing and cooling process, the understanding of the process can substantially be increased and provides a basis for further advanced process design and optimisation. For this purpose, the current state of research will be used and extended in the cross-link-dependent modelling of material behaviour. In particular, the thermo-chemical properties of the epoxy resin (EP) will be consistently characterised and modelled as a function of temperature and cross-linking. Our research on EP suggests that if heat conduction and heat of reaction are neglected, deviations from the expected material behaviour (e.g. non-linear shrinkage) and influencing the reaction kinetics can occur.

在拟议的研究项目中，固化和冷却过程中，将首次分析具有连续纤维增强的厚壁热固性纤维增强塑料（FRP）的过程依赖性物质行为，并在固化和冷却过程中首次分析。申请人追求描述发生的热化学现象的方法，以及全部FRP内部的温度均衡过程，以制定基于此的适当有效的建模和均质化策略，以将其转移到层压层和多层复合材料中。该项目的总体目标是对厚墙热固性FRP的处理过程中温度均衡过程的现实和跨尺度预测，完全考虑了交联依赖和温度依赖的材料特征。模拟了厚壁的FRP层压板中的时间和空间分辨的温度和固化程度分布，直到纤维浸没过程后立即开始，直到完整的冷却过程。基于验证测试，可以证明开发的宏模型可用于精确描述厚壁层压板中的温度和固化程度分布。此外，通过将开发的热化学模型与现有的交联热弹性材料模型联系起来，将开发出FRP的机械模型，这可以准确地描述了RVE水平上的残留应力发展。通过在固化和冷却过程中将温度补偿过程与热化学现象联系起来，可以大大提高对过程的理解，并为进一步的高级过程设计和优化提供了基础。为此，将在材料行为的交联依赖性建模中使用并扩展研究状态。特别是，环氧树脂（EP）的热化学性能将始终如一地表征并建模，这是温度和交联的函数。我们对EP的研究表明，如果忽略了热传导和反应热，则可能会发生预期的物质行为（例如非线性收缩）并影响反应动力学。