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Thermographic Characterisation of Deformation und Fracture of Semicrystalline Polymers as Basis for Constitutive Modelling of the Material Behaviour

半晶聚合物变形和断裂的热成像表征作为材料行为本构模型的基础

基本信息

批准号：
284060380
负责人：
Professor Dr.-Ing. Jens-Peter Majschak, since 5/2018
金额：
--
依托单位：
Leibniz-Institut für Polymerforschung Dresden (IPF)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/284060380?language=en
关键词：
Thermographic Characterisation Deformation und Fracture

项目摘要

During processing as well as deforming of polymer materials dissipative processes cause heat production, by which the mechanical properties of the materials change. Describing the mechanical behavior of polymers this feed-back is often taken into consideration only to an insufficient extent.The objective target of the present proposal is the detection of dissipative heating of polymers during deformation and fracture by thermography with high space and time resolution and the correlation of this heating to certain molecular deformation mechanisms. Therefore it will be necessary to adapt a thermography measuring system to the described task and to develop a suitable data processing. A model for the description of the thermal behavior will be developed by local energy balancing.The structure characterization will be performed by Online-SAXS and -WAXS, differential scanning calorimetry (DSC) as well as microscopy in parallel.An amorphous polymer (Polycarbonate, PC) as well as a semi-crystalline polymer (Polyethylene terephthalate, PET) were chosen as model systems.Finally, the results shall be generalized and become part of a constitutive model of the materials behavior. By this way the project will deliver essential contributions to improve material understanding of amorphous as well as semi-crystalline polymers.

在聚合物材料的加工和变形过程中，耗散过程导致热产生，由此材料的机械性能发生变化。描述聚合物的力学行为，这种反馈往往是考虑到只有在不足的程度。本建议的客观目标是通过具有高空间和时间分辨率的热成像检测聚合物在变形和断裂过程中的耗散加热，以及这种加热与某些分子变形机制的相关性。因此，有必要使热成像测量系统适应所描述的任务，并开发合适的数据处理。通过局部能量平衡建立了描述热行为的模型，并通过Online-SAXS和-WAXS、差示扫描量热法（DSC）和显微镜同时进行结构表征。（聚碳酸酯，PC）以及半结晶聚合物（聚对苯二甲酸乙二醇酯，PET）被选为模型系统。最后，结果将被推广，并成为材料行为的本构模型的一部分。通过这种方式，该项目将提供重要的贡献，以提高材料的理解，无定形以及半结晶聚合物。