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Investigations on the relationship between processing, microstructure and properties of one-step long-fibre reinforced polymer sandwich components

一步法长纤维增强聚合物夹层构件加工、微观结构和性能关系的研究

基本信息

批准号：
256610470
负责人：
Professor Dr.-Ing. Peter Elsner (†)
金额：
--
依托单位：
Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
依托单位国家：
德国
项目类别：
Research Grants
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/256610470?language=en
关键词：
Investigations relationship between processing microstructure

项目摘要

The aim of the project is the investigation of the relationship between processing, microstructure and properties of long-fibre reinforced polymer sandwich components processed in one step by different foam injection molding technologies. In detail, the well-established MuCell®-technology (Trexel Inc.) representing the state-of-the-art in this field and being therefore the reference technology in this project is compared to the novel LFT-D-foaming technique based on a gravimetric addition of the foaming agent inside a twin crew extruder. Both variants of Thermoplastic foam injection moulding (TSG) result in an integrally produced foam structure made from one material (LFT-D), possessing dense face sheets and hence representing a sandwich structure. All parts of the sandwich (face sheets and core foam) are long-fibre reinforced.For non-reinforced materials, the correlation between material properties, foam structure and processing parameters have been thoroughly researched on, while for long-fibre reinforced foams, these correlations are unknown up today. This gap will be closed by carrying out the proposed project. For this purpose, a modular shearing edge mould offering a variothermic process control to adjust the core/face sheet ratio wil be used and applied for respectively. Changeable mould inlays offer high flexibility regarding the component geometry (fins, beads, screw bosses) as well as the investigation of its influence on the foaming behaviour. In this regard, the question arises how the implemented fibres may influence the foaming process, how the foam/face sheet ratio may adjusted depending on the process parameters and how the fibres may be oriented inside the composite as an artefact from the foaming and injection process. Furthermore, it has to be clarified whether the correlations between process, microstructure and properties known from non-reinforced foams may be transferred to long-fibre reinforced foams. These findings will be correlated with the outcoming mechanical properties and consequently with material models for foam structures. Hereby, the behaviour under near-service, i.e. quasistatic or impact, loads is major interest. In this regard the difference between the two processes variants will be considered as the LFT-D-route allows for longer fibres in the final product in comparison to the MuCell®-technology.

该项目的目的是研究通过不同的泡沫注射成型技术一步加工的长纤维增强聚合物夹层部件的加工、微观结构和性能之间的关系。详细地，成熟的MuCell®-技术（Trexel Inc.）代表该领域的最新技术水平并因此作为该项目中的参考技术，将其与基于在双螺杆挤出机内按重量添加发泡剂的新型LFT-D发泡技术进行比较。热塑性泡沫注射成型（TSG）的两种变体导致由一种材料（LFT-D）制成的一体化生产的泡沫结构，具有致密的面板，因此代表夹层结构。对于非增强材料，材料性能、泡沫结构和工艺参数之间的相关性已经得到了深入的研究，而对于长纤维增强泡沫，这些相关性目前还不清楚。这一差距将通过实施拟议的项目予以弥补。为此，将分别使用和应用提供变温过程控制以调节芯/面板比率的模块化剪切边缘模具。可更换的模具嵌体在组件几何形状（翅片、珠、螺杆凸台）以及研究其对发泡行为的影响方面提供了高度灵活性。在这方面，出现了这样的问题，即所实施的纤维如何影响发泡过程，如何根据工艺参数调节泡沫/面板比率，以及纤维如何在复合材料内部取向为来自发泡和注射过程的人工制品。此外，必须澄清的是，从非增强泡沫中已知的工艺、微观结构和性能之间的相关性是否可以转移到长纤维增强泡沫中。这些研究结果将与即将到来的机械性能，因此与泡沫结构的材料模型。因此，近服务下的行为，即准静态或冲击，负载是主要的利益。在这方面，将考虑两种工艺变体之间的差异，因为与MuCell®技术相比，LFT-D路线允许最终产品中的纤维更长。