"Repair of Thermoplastic Composites: Processing, Modelling and Characterization"

“热塑性复合材料的修复：加工、建模和表征”

• 批准号: 418239-2012
• 负责人: Dubé, Martine
• 金额: $ 1.68万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=551302
• 关键词: Repair; Thermoplastic; Composites; Processing; Modelling

To successfully achieve cost and weight reduction in the next generations of business and commercial airplanes, new advanced structural materials must be investigated. Thermoplastic composite materials have the potential to lead to such cost and weight reductions with some advantages over thermosetting composites like their better damage tolerance. This advantage makes them ideal candidates for applications in which impact damage is likely, e.g., wing leading edges. Repair methods were developed for thermosetting composites. In the case of bonded repairs, the damaged composite plies are removed from the component's surface and new pre-impregnated plies are applied on the surface. Curing of the material is then achieved by applying heat and pressure. When it comes to thermoplastic composites, the damaged components are currently being replaced instead of being repaired, with associated negative cost and environmental impacts. The lack of research done on repair of thermoplastic composites also limits their use to small components as it would become very expensive to replace a large and complex aerospace structure component. In light of the above, this research program aims to develop methodologies for repairing high performance thermoplastic composite structures by means of modelling, processing and characterization. The long-term environmental degradation and ageing of thermoplastic composite welded joints will be investigated and innovative manufacturing techniques will be developed to repair thermoplastic composites, taking into account their unique ability to be re-processed or re-welded. This will include repair of delamination created in a weld line by impact or repair of more severe damage, e.g., replacement of several plies of a composite components, always with the goal of restoring the initial mechanical properties of the component. The manufacturing techniques will be linked to process models that predict the consolidation, crystallinity and degradation of the polymer as it is re-processed or re-welded. This work will provide Canadian aerospace industry with repairing methods for high performance thermoplastic composite structures, thus achieving cost reduction and positive environmental impact.

为了成功实现下一代商业和商业飞机的成本和体重降低，必须研究新的先进结构材料。热塑性复合材料有可能导致这种成本和体重降低，而与热固化复合材料相比，诸如它们的损伤耐受性更好。这一优势使它们成为可能造成影响损害的应用理想的候选者，例如机翼前缘。开发了用于热固性复合材料的修复方法。 在粘合维修的情况下，从组件的表面上除去受损的复合层，并在表面上施加了新的预先浸渍的层。然后，通过施加热量和压力来实现材料的固化。当涉及热塑性复合材料时，目前正在替换受损的组件而不是维修，并带有负面成本和环境影响。缺乏修复热塑性复合材料的研究也将其用于小部件的使用限制，因为它可以更换大型且复杂的航空航天结构组件非常昂贵。鉴于上述研究，该研究计划旨在开发通过建模，加工和表征来修复高性能热塑性复合结构的方法。将研究热塑性复合焊接接头的长期环境下降和老化，并将开发创新的制造技术来修复热塑性复合材料，考虑到其重新处理或重新处理或重新焊接的独特能力。这将包括通过撞击或修复更严重的损坏（例如，更换复合组件的几个平原）来修复在焊接线上产生的分层，始终是恢复组件的初始机械性能。制造技术将与预测聚合物重新处理或重新焊接的过程模型相关。这项工作将为加拿大航空业提供高性能热塑性复合结构的维修方法，从而实现成本降低和积极的环境影响。