Fatigue Behavior of Functionally Graded Ceramics­ Synthesis, Experiments, and Analysis

该奖项的研究目标是：1）创造一种新型的梯度玻璃/氧化铝/玻璃（G/A/G）夹层结构，与其单块氧化铝或玻璃对应物相比，具有更好的接触，滑动和弯曲损伤抵抗力，用于生物医学和工程应用; 2）发现结构之间的关键相互关系（微观和宏观）和性能（疲劳接触，滑动和弯曲阻力）的功能梯度材料（FGM）使用模型G/A/G系统。 接触、滑动和弯曲是许多生物力学和工程应用中遇到的最常见的疲劳模式。将设计和合成G/A/G功能梯度材料，并研究其疲劳行为，以建立结构？财产关系。这些成果包括开发一系列新的功能梯度材料及其制造新路线，更好地理解功能梯度材料的结构-性能关系，研究成果的文献记录，研究生和本科生…如果成功，这项研究将导致下一代结构陶瓷的发展，提高人工关节的抗损伤能力，假牙、航空航天、军事、微电子和其他工程应用。拟议的研究将扩展FGM的疲劳行为的现有知识，并在一系列应用中设计FGM提供指导方针。测试方法，加载一个球到平面脆性层（S）支持的一个兼容的基板，是一个简单而强大的技术，用于阐明接触，滑动，和弯曲的陶瓷抗损伤性。研究结果将传播到生物医学，材料和工程文献中，以便为研究合成材料和生物组织的断裂行为以及科学和医疗保健界的新材料和设备创造新的场所。研究生，本科理科学生和高中学生将受益于课堂教学和参与研究。

The research objectives of this award are 1) to create a novel graded glass/alumina/glass (G/A/G) sandwich structure with improved contact, sliding and flexural damage resistance compared to its monolith alumina or glass counterpart for biomedical and engineering applications; and 2) to discover critical interrelationships between structure (micro and macro) and properties (fatigue contact, sliding, and flexural resistance) of functionally graded materials (FGMs) using a model G/A/G system. Contact, sliding, and flexure are the most common fatigue modes encountered in numerous biomechanical and engineering applications. G/A/G FGMs will be designed and synthesized, and their fatigue behavior will be investigated to establish the structure?{property relationships. Deliverables include the development of a family of new FGMs and new routes for their manufacture, better understanding of structure¡Vproperty relationships of FGMs, documentation of research results, graduate and undergraduate students¡¦ education, and research experiences for underrepresented minority high school students.If successful, this research will lead to the development of next-generation structural ceramics with improved damage resistance for artificial joints, dental prostheses, aerospace, military, microelectronics, and other engineering applications. The proposed research will extend the current knowledge of fatigue behavior of FGMs and provide guidelines for designing FGMs across an array of applications. The testing method, loading a ball onto flat brittle layer(s) supported by a compliant substrate, is a simple yet powerful technique for elucidating contact, sliding, and flexural damage resistance of ceramics. The results will be disseminated to the biomedical, materials, and engineering literature to allow the creation of new venues for studying the fracture behavior of synthetic materials and biological tissues, as well as new materials and devices for the scientific and healthcare communities. Graduate, undergraduate science students and high school students will benefit through classroom instruction and involvement in the research.