Experimentally validated physics-based multi-scale models for long-term durability assessment of next-generation lightweight composite vehicles

经过实验验证的基于物理的多尺度模型，用于下一代轻质复合材料车辆的长期耐久性评估

• 批准号: RGPIN-2016-03978
• 负责人: Montesano, Giovanni
• 金额: $ 1.68万
• 依托单位: University of Waterloo
• 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=679245
• 关键词: Experimentally; validated; physics; based; multi

For decades transportation vehicles have utilized polymer matrix composite (PMC) materials for secondary structural components, including aircraft aerodynamic fairings and interior automobile panels, due to their high strength and low weight when compared to metallic alloys. Only in recent years have they been utilized for primary structures, which stems from economic and societal concerns pressuring manufacturers to develop lighter fuel-efficient vehicles. Consequently, the long-term reliability of PMCs is now highly important, in particular for components with fatigue critical performance indicators such as automobile chassis side beams and aircraft wing spars. However, there exists a major scientific gap for addressing their performance under complex loading conditions.*** Currently, design tools for assessing the long-term behaviour of PMC structures are unavailable, where instead designers use inaccurate empirical failure theories. The resulting drawback is twofold: (i) designs are conservative and suboptimal, and (ii) manufacturers require extensive and costly test programs to certify new products. Since the 10-year forecast for lightweight PMC usage in transportation vehicles is an expected growth by 50% to meet drastic fuel efficiency targets, it is imperative to address these major issues. The proposed research program aims to generate a knowledge base for lightweight PMCs, and develop design tools for their long-term assessment in order to minimize the weight of next-generation composite vehicles. Through an experimental test program the multiaxial cyclic behaviour and failure processes of PMCs will be characterized, enabling the development of a physically-based multi-scale simulation platform for assessing their performance under repeated loading conditions. The long-term objective is to efficiently design and certify next-generation lightweight composite vehicles by integrating the model into the product design process. This work will redefine the understanding and usage of lightweight PMC materials for fatigue critical applications in transportation vehicles.*** This is the first study to consider multi-scale damage-based fatigue tools for the design of composite structures. With drastic fuel efficiency targets currently set by manufacturers, this ensures that the proposed research is timed correctly to develop the knowledge-base and enable technology required to better design next-generation lightweight composite vehicles, which are expected to be market-ready in the next decade. The innovative advancements made will increase the safety of vehicles and decrease development costs, allowing Canadian industry partners to stay competitive. New lightweight fuel-efficient vehicles will lead to reduced environmental impact, helping Canada gain global leadership in green technology, and reduce operating costs for end users of these products.**

几十年来，运输车辆一直使用聚合物基质复合材料（PMC）材料，用于二级结构组件，包括飞机空气动力学隔热层和内部汽车板，因为它们的强度高和与金属合金相比的重量较低。仅在近年来，它们才被用于主要结构，这源于经济和社会问题，迫使制造商开发较轻的燃油式车辆。因此，PMC的长期可靠性现在非常重要，尤其是对于具有疲劳关键性能指标的组件，例如汽车底盘侧梁和飞机翼翼。但是，存在一个主要的科学差距来解决其在复杂的负载条件下的性能。由此产生的缺点是双重的：（i）设计是保守的和次优的，（ii）制造商需要广泛且昂贵的测试程序来证明新产品。由于对运输车辆轻量级PMC使用的10年预测预期可以达到50％以满足燃油效率急剧的目标，因此必须解决这些主要问题。拟议的研究计划旨在为轻质PMC生成知识库，并为其长期评估开发设计工具，以最大程度地减少下一代复合车辆的重量。通过实验测试程序，将对PMC的多轴循环行为和故障过程进行表征，从而能够开发基于物理的多尺度模拟平台，以评估其在重复加载条件下的性能。长期目标是通过将模型集成到产品设计过程中，有效地设计和认证下一代轻型复合车辆。这项工作将重新定义轻巧PMC材料在运输车辆中疲劳关键应用的理解和使用。借助制造商目前设定的燃油效率急剧目标，这确保了拟议的研究正确定时以开发知识库和启用技术，以更好地设计下一代轻量级复合车辆，预计将在未来十年内进行市场准备就绪。创新的进步将提高车辆的安全性并降低开发成本，从而使加拿大行业合作伙伴保持竞争力。新的轻质燃油式车辆将导致环境影响减少，帮助加拿大在绿色技术方面获得全球领导力，并降低这些产品的最终用户的运营成本。**