Study on design allowables for fibre-steered laminated composites in aircraft structures

飞机结构纤维导向层合复合材料的设计许用值研究

• 批准号: 2297691
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2297691
• 关键词: Study; design; allowables; fibre; steered

This PhD studentship is a collaboration between the University of Bristol and Embraer SA based in Brazil who is the world's third largest producer of civil aircraft. The research will explore the feasibility of applying novel fibre-steering design to composite aircraft structures, focusing mainly on the challenges arising in evaluating the design allowables for the laminates including curved fibres. Although the current state-of-the-art, automated fibre placement (AFP) technology, enables the fibre steering in production of composite aerospace structures, the process-induced defects is the most critical problem in realising such a design as the defect generation mechanism is complex and material-dependent. Furthermore, there is no standard suitable for determining the design allowables for the fibre-steered laminates that can take into account the effect of the curved fibres in the structure and the defects. The project will start by reviewing the current industrial practice for design allowables of straight fibre laminates and identifying its limitation for fibre-steered laminates. The research will consider modifying or developing new test methods and/or specimen designs to address the unique aspects of the laminates including curved fibres and manufacturing defects, and their impact on the structural integrity will be studied through an extensive coupon testing programme and rigorous evaluation of the test results. The test specimens will be manufactured to reflect the manufacturing characteristics of the AFP and a novel fibre steering technology developed at the University of Bristol, Continuous Tow Shearing. The studentship will be jointly supervised by the academic and industrial supervisors, and a unique opportunity for a short secondment at Embraer will be provided

这个博士生奖学金是布里斯托大学和巴西航空工业公司之间的合作，巴西航空工业公司是世界第三大民用飞机生产商。研究将探讨将新型纤维转向设计应用于复合材料飞机结构的可行性，主要集中在评估包括弯曲纤维的层压板的设计许用值时所面临的挑战。尽管目前最先进的自动纤维铺放（AFP）技术能够在复合航空航天结构的生产中实现纤维转向，但工艺引起的缺陷是实现这种设计的最关键问题，因为缺陷产生机制是复杂的且依赖于材料。此外，没有适合于确定可以考虑结构中弯曲纤维的影响和缺陷的纤维转向层压板的设计容许值的标准。该项目将首先审查目前的工业实践的设计许用值的直纤维层压板，并确定其限制纤维转向层压板。研究将考虑修改或开发新的测试方法和/或试样设计，以解决层压板的独特方面，包括弯曲纤维和制造缺陷，并通过广泛的试样测试计划和严格的测试结果评估来研究它们对结构完整性的影响。制造的试样将反映AFP的制造特性和布里斯托大学开发的新型纤维转向技术，即连续丝束剪切。该奖学金将由学术和工业主管共同监督，并将提供在巴西航空工业公司短期借调的独特机会