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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=684279
• 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，高性能运动用品以及海洋和风力涡轮机结构，逐渐依靠基于纤维增强的热固性和热塑性聚合物的先进复合材料。传统的复合制造技术（例如手篮）是劳动密集型，耗时且昂贵的。对复合零件的需求增加，加上其规模和复杂性的增加，对传统加工方法产生了压力，并驱动了对快速，自适应和成本效益的制造替代品的需求。与自动制造工艺（例如自动胶带铺设（ATL）和自动化纤维放置（AFP））相关的制造时间和成本较低，这为满足航空航天和汽车行业中复合材料的日益增长的需求提供了巨大的希望。这些自动化过程的生存能力的限制因素是它们产生复杂几何形状的能力。为了提高生产率，同时保持组件的几何复杂性，进行了三步过程。首先，平坦的层压板由自动化的机器或手工上篮放置。然后，将这些层压板进行形成过程。该形成步骤涉及在固化之前将热和压力转化为所需形状的压力。最后，形成的零件被固化。为了确保成功的复合形成，必须彻底了解引起缺陷（例如皱纹）的机制。复合形成的成功取决于选择控制材料特性并防止任何平面内和平面外皱纹的适当处理条件来确定的。