Forming of Composites

复合材料的成型

• 批准号: RGPIN-2018-05086
• 负责人: Hojjati, Mehdi
• 金额: $ 2.33万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=653743
• 关键词: Forming; Composites

Many modern structures, including primary aerospace structures, high performance sporting goods, and marine and wind turbine structures, are progressively coming to rely on advanced composite materials based on fiber-reinforced thermoset and thermoplastic polymers. Conventional composite manufacturing techniques, such as hand lay-up, are labor-intensive, time consuming, and costly. Increased demand on composite parts, together with an increase in their size and complexity, puts a strain on traditional processing methods and drives the need for fast, adaptive, and cost-effective manufacturing alternatives. The low manufacturing times and costs associated with automated manufacturing processes such as Automated Tape Laying (ATL) and Automated Fiber Placement (AFP) offer great promise to meet the growing need for composite materials in the aerospace and automotive industries. The limiting factor for the viability of these automated processes is their capacity to produce complex geometries. To improve productivity while maintaining the geometrical complexity of components, a three-step process is undertaken. First, flat laminates are laid down by automated machines or hand layup. Then these laminates are subjected to a forming process. This forming step involves the application of heat and pressure to transform flat laminates into the desired shape prior to curing. Finally, the formed parts are cured. To ensure successful composite forming, the mechanisms that cause defects such as wrinkling must be thoroughly understood. The success of composite forming is determined by selection of proper processing conditions which control the material properties and prevent any in-plane and out-of-plane wrinkling.

许多现代结构，包括初级航空航天结构、高性能体育用品、船舶和风力涡轮机结构，正逐渐依赖于基于纤维增强热固性和热塑性聚合物的先进复合材料。传统的复合材料制造技术，如手工铺层，是劳动密集型、耗时和昂贵的。复合材料零件需求的增加，加上其尺寸和复杂性的增加，给传统的加工方法带来了压力，并推动了对快速、自适应和经济高效的制造替代方案的需求。自动化制造工艺（如自动铺带（ATL）和自动纤维铺放（AFP））带来的低制造时间和低成本为满足航空航天和汽车行业对复合材料日益增长的需求提供了巨大的希望。这些自动化过程可行性的限制因素是它们产生复杂几何形状的能力。为了在保持零件几何复杂性的同时提高生产率，采用了三步工艺。首先，平面层压板是由自动化机器或手工铺设。然后对这些层压板进行成形处理。这一成形步骤包括在固化之前应用热量和压力将平面层压板转化为所需的形状。最后，对成形件进行固化。为了确保成功的复合材料成形，必须彻底了解引起起皱等缺陷的机制。选择合适的工艺条件，控制材料的性能，防止面内面外起皱，是决定复合材料成形成功与否的关键。