Collaborative Research: Innovations in Net-Shape Composite Fabrication through Microscale Modeling of Melt Infiltration

合作研究：通过熔体渗透的微尺度建模实现净形复合材料制造的创新

• 批准号: 0140180
• 负责人: Brian Mitchell
• 金额: $ 7.69万
• 依托单位: Tulane University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140180&HistoricalAwards=false
• 关键词: Collaborative; Research; Innovations; Net; Shape

Many important composite materials are made by melt infiltration, in which polymers or metals are infiltrated into fibrous preforms. To minimize post-processing and machining, it is desirable to create parts directly from the impregnation step, a procedure called net-shape fabrication. While numerical simulation is a crucial part of process design, standard models operate at the continuum scale (i.e., the underlying fiber matrix is viewed as a continuum phase). This approach is necessary for practical reasons, but it requires significant empiricism to generate spatially averaged constitutive equations and parameters. Furthermore, current empirical techniques do not effectively account for important microcscale phenomena such as fiber anisotropy, wetting effects, and void formation during impregnation.In this collaborative research project conducted by researchers at Louisiana State University and Tulane University, state-of-the-art microscale modeling techniques will be applied to the impregnation process, which will allow analyses to be performed using first principles. Experiments will be performed to aid in the model development and to validate its quantitative capabilities. In a second phase of the research, results from the microscale simulations will be scaled up and transferred to continuum-scale models for net-shape fabrication. The ultimate goal is for this multiple-scale approach to replace much of the empiricism associated with current methods, thereby improving fabrication techniques. The collaborative nature of this project will provide unique learning opportunities for undergraduate and graduate students, with graduate students from LSU participating in experimental aspects of the research at Tulane, and undergraduates from both institutions being included in research meetings at LSU. In addition, active participation in the Louisiana Alliance for Minority Participation is planed to provide summer research opportunities for students from under-represented groups.

许多重要的复合材料是通过熔融浸润制成的，其中聚合物或金属被渗入纤维的预形成。为了最大程度地减少后处理和加工，希望直接从浸渍步骤（称为净形制造的过程）中创建零件。虽然数值模拟是过程设计的关键部分，但标准模型以连续量表运行（即，基础纤维基质被视为连续阶段）。由于实际原因，这种方法是必要的，但是它需要重要的经验主义才能产生空间平均的本构方程和参数。此外，当前的经验技术无法有效地说明重要的微观现象，例如纤维各向异性，润湿效应和浸渍过程中的空隙形成。在路易斯安那州立大学和杜兰大学的研究人员进行的此协作研究项目中，杜兰大学和杜兰大学的省级省级Microscale Microscale Modeliqueres允许使用Impreations进行分析，以允许使用Impreations，该过程将允许分析，并将其用于Impreation，并将其分析。将进行实验以帮助模型开发并验证其定量能力。在研究的第二阶段中，将对微观模拟的结果进行缩放并转移到连续尺度模型以进行净形成。最终目标是采用这种多种规模的方法来代替与当前方法相关的许多经验主义，从而改善了制造技术。 该项目的协作性质将为本科生和研究生提供独特的学习机会，来自LSU的研究生参与了Tulane的研究实验方面，以及来自LSU的研究会议中的两家机构的本科生。此外，计划积极参加路易斯安那州少数群体参与的联盟，为来自代表性不足的群体的学生提供夏季研究机会。