Dynamic Response and Stochastic Mechanics of Composite Materials and Structures

由轻质纤维增强复合材料制成的机械和结构部件正越来越多地应用于机械、汽车、航空航天、发电和传输，包括绿色能源、体育器材、娱乐和民用基础设施工程应用。然而，在绝大多数这样的应用中，静态和准静态组件的应用已经完全发展到所需的可靠性和安全水平。此外，这些组件已针对高性能进行了优化。对于动态组件，情况并非如此。造成这种限制的原因是，在这种应用中遇到的时变服务负载下的组合组件的动态响应和相关的不稳定性还没有得到充分的研究和了解。 申请人已经制定了一项长期研究计划来解决这一限制，目标是为实际应用构思、设计和开发创新的高性能复合组件。该研究计划的长期目标是：(1)将安全、可靠、经济、创新和高性能的复合材料部件和结构概念化；(2)准确确定此类部件和结构的关键故障、动态响应和动态不稳定性；(3)为此类部件和结构的预期可靠性、安全性和性能要求开发最优的成本节约设计。在过去的二十年里，这项研究计划取得了重大进展。在接下来的五年里，将对一类特定的先进复合材料结构进行深入而创新的研究，这种结构被称为变截面复合材料结构。重点将放在旋转的锥形组合梁和旋转轴，以及平板和曲面复合板。将制造这种组合梁和板的样品，并对其进行振动响应和故障测试。将为此类结构的设计进行高级计算建模以及应力、动态和失效分析。将进行具有成本效益的创新组合梁、轴和板的设计。 将在这项研究中招募和培训一些本科生和研究生。积极寻求和利用产业协作和国际网络。拟议的研究将大大有助于加拿大工程行业提高全球竞争力和盈利能力，从而为加拿大的经济发展做出重大贡献。它还服务于加拿大学术部门，吸引和培养具有全球竞争力、高技能和非常有才华的学生和工程师。高质量的前沿研究将在国际研究媒体和会议上进行和发表。

Mechanical and structural components made of lightweight fiber-reinforced composite materials are increasingly being used in mechanical, automotive, aerospace, power generation and transmission including green energy, sporting equipment, recreational, and civil infrastructure engineering applications. However, in vast majority of such applications, applications to static and quasi-static components have been fully developed to the required reliability and safety levels. Also such components have been optimized for high performance. This is not the case with dynamic components. The reason for this limitation is that the dynamic response and associated instabilities of composite components under the time-varying service loadings encountered in such applications have not yet been adequately studied and understood. The applicant has developed a long-term research program to address this limitation and with the goal of conception, design and development of innovative high-performance composite components for practical applications. The long-term objectives of this research program have been: (1) To conceptualize safe, reliable, cost-effective, innovative and high-performance composite components and structures; (2) To determine accurately the critical failures, dynamic response, and dynamic instabilities of such components and structures; (3) To develop optimal cost-saving designs for desired reliability, safety and performance requirements of such components and structures. Significant progress has been made in the research program over the past two decades. Over the next five years, intensive and innovative research on a certain specific class of advanced composite structures, called “tapered composite structures” will be conducted. Emphasis will be placed on rotating tapered composite beams and spinning shafts, and flat and curved composite plates. Samples of such composite beams and plates will be manufactured and tested for vibration response and failures. Advanced computational modeling and the stress, dynamic and failure analyses for design of such structures will be conducted. The cost-effective design of innovative composite beams, shafts and plates will be performed. A number of undergraduate and graduate students will be recruited and trained in the research. Industrial collaboration and international networking will be actively sought and used. The proposed research will serve significantly the Canadian engineering industries in making them even more globally competitive and profitable, and hence contributes significantly to the economic development of Canada. It also serves the Canadian academic sector in attracting and training globally-competitive, highly skilled, and very talented students and engineers. High quality cutting-edge research will be conducted and published in international research media and meetings.