Experimentally validated models for the prediction of fatigue damage progression and failure of conventional and green polymeric composites in aerospace and biomedical applications

经过实验验证的模型，用于预测航空航天和生物医学应用中传统和绿色聚合物复合材料的疲劳损伤进展和失效

• 批准号: RGPIN-2015-03944
• 负责人: Fawaz, Zouheir
• 金额: $ 1.82万
• 依托单位: Ryerson 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=680696
• 关键词: Experimentally; validated; models; prediction; fatigue

The use of polymer matrix composites (PMCs) in modern airplanes has dramatically increased since 2005, leading to changes in aircraft performance and environmental friendliness that have proven to be transformative within the worldwide aerospace industry. Such rapid proliferation, while opening the door wide for many new applications such as the biomedical ones proposed herein, also calls, among other things, for the development of analytical models that can help in the prediction of the long term fatigue failure of those PMCs. The latter is the aim of the proposed research program which will also focus on their emerging biomedical applications. The research effort will aim to confirm the validity of the proposed models by conducting mechanical loading tests and comparing the obtained results with those predicted by the models. The research will focus on two classes of PMCs, namely synthetic fiber-reinforced PMCs used in structural load bearing aerospace applications and bio-based (green) PMCs with a focus on those reinforced with flax fibers. The latter further addresses a pressing need to develop more environmentally friendly PMCs. The specific objectives include the development of generalized micromechanical-based fatigue failure prediction models that combine the concepts of micromechanics with progressive continuum damage mechanics (CDM) and statistical considerations, the development of computational software to implement the proposed fatigue models into Finite Element solutions, and the experimental characterization of various PMC material systems in order to confirm the accuracy and generality of the proposed models. The general approach for modeling is to represent the basic laminate building block (the lamina) through a network of micromechanical representative volume elements (RVE), model the failure of the lamina based on the behaviour of RVE under loading, and predict the property degradation and ultimately failure of the laminate through a continuum damage mechanics scheme. For the flax fiber based composites proposed for use in biomedical applications, the general approach will include the experimental characterization of their unidirectional laminae mechanical response under temperature, moisture, and loading conditions representative of their intended biomedical application. The ability to use accurate predictive models and the availability of the large amount of test data that will be produced through the proposed research will generate the necessary confidence in PMCs performance and pave the way to their wider use in the light weight, fuel efficient and environmentally friendly airplanes of the future, as well as biomedical implants where the advances made through the proposed research program will take this class of advanced materials one step closer to a widespread usage in this burgeoning area of engineering materials application.**

自2005年以来，聚合物基复合材料(PMC)在现代飞机中的使用急剧增加，导致了飞机性能和环境友好性的变化，事实证明，这些变化在全球航空航天行业中是革命性的。如此快速的扩散，在为许多新的应用打开了大门，例如这里提出的生物医学应用，也要求开发分析模型，以帮助预测这些PMC的长期疲劳失效。后者是拟议研究计划的目标，该计划还将重点放在它们新兴的生物医学应用上。研究工作的目的是通过进行机械载荷试验并将所得结果与模型预测的结果进行比较，来验证所提出的模型的有效性。研究将集中在两类PMCs，即用于结构承重航空航天的合成纤维增强PMCs和生物基(绿色)PMCs，重点是那些用亚麻纤维增强的PMCs。后者进一步解决了发展更有利于环境的私营军保公司的迫切需要。具体目标包括开发基于细观力学的广义疲劳失效预测模型，将细观力学的概念与渐进连续介质损伤力学(CDM)和统计学的考虑相结合，开发计算软件将所提出的疲劳模型转化为有限元解，并对各种PMC材料系统进行实验表征，以确认所提出模型的准确性和通用性。建模的一般方法是通过微观机械代表性体积单元(RVE)的网络来表示基本的层合板构件(层合板)，基于RVE在载荷下的行为来模拟层合板的失效，并通过连续损伤力学方案来预测层合板的性能退化和最终失效。对于建议用于生物医学应用的亚麻纤维基复合材料，一般方法将包括在代表其预期生物医学应用的温度、湿度和载荷条件下对其单向板层力学响应的实验表征。使用精确预测模型的能力和通过拟议的研究将产生的大量测试数据的可用性将使人们对PMCs的性能产生必要的信心，并为它们在未来轻型、省油和环保的飞机以及生物医学植入物中的更广泛使用铺平道路，在生物医学植入物中，通过拟议的研究计划取得的进展将使这类先进材料在这一新兴的工程材料应用领域更接近广泛使用。**