Hot Drape Forming of Thermosetting Composites

热固性复合材料的热悬垂成型

• 批准号: 261632-2013
• 负责人: Hojjati, Mehdi
• 金额: $ 1.68万
• 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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638609
• 关键词: Hot; Drape; Forming; Thermosetting; Composites

To automate production of composite parts using prepreg (towpreg), automated tape placement (ATL) and automated fibre placement (AFP) technologies have been developed. Many aircraft structural parts such as ribs, frames, spars or brackets are too small or too complex in shape to be efficiently and cost-effectively manufactured using automated technologies such as AFP. To take advantage of the automation (AFP) to manufacture these parts, two-step process is proposed and used. A flat stack of uncured plies with correct shape and stacking sequences is first created by automated processes such as ATL or AFP. Then flat stack is transferred to the forming set-up where it is turned into the final shape using heat and pressure (vacuum) before being cured. This is called hot drape forming. The heat applied during the process reduces the resin viscosity, while the pressure (vacuum) provides the mechanical action to form the laminate. A better understanding of forming process of laminated composite is required to capture the physics of the process and to develop models. Then models can be used to simulate and to optimize the process. Focus of this study will be on the resin role on transferring the shear load and supporting the fibres during the forming to prevent the fibres from buckling and wrinkling. Processing window has to be defined to achieve a good quality part at the end of operation. Through this two steps process, the full advantage of automation for manufacturing of small and complex parts can be explored. This will show the Canadian aerospace industry even broader advantage of automation using AFP for manufacturing different parts at lower cost.

为了使用预处理（TOWPREG）自动生产复合零件，已经开发了自动胶带放置（ATL）和自动化纤维放置（AFP）技术。许多飞机的结构零件，例如肋骨，框架，翼梁或支架太小或太复杂，无法有效地使用自动化技术（例如AFP）进行成本效益。为了利用自动化（AFP）制造这些零件，提出了两步过程。自动化过程（例如ATL或AFP）创建了一个完整的形状和堆叠序列的未固定层的平坦堆栈。然后将扁平堆栈转移到成型设置中，在固化之前，使用热和压力（真空）将其转换为最终形状。这称为热悬垂形成。在此过程中施加的热量降低了树脂粘度，而压力（真空）提供了形成层压板的机械作用。需要更好地理解层压复合材料的形成过程，以捕获过程的物理和开发模型。然后，模型可用于模拟和优化过程。这项研究的重点将是在形成过程中传递剪切负荷和支撑纤维的树脂作用，以防止纤维屈曲和皱纹。必须定义处理窗口，以在操作结束时实现高质量的零件。通过这两个步骤过程，可以探索自动化的全部优势，用于制造小型和复杂零件。这将表明加拿大航空航天行业将使用法新社以较低的成本制造不同零件的自动化更广泛的优势。