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

该奖项的研究目标是：1)创造一种新型的分级玻璃/氧化铝/玻璃（G/ a/ G）夹层结构，与生物医学和工程应用的单块氧化铝或玻璃相比，该结构具有更好的接触、滑动和抗弯曲损伤能力；2)使用模型G/ a /G系统发现功能梯度材料（fgm）的结构（微观和宏观）和性能（疲劳接触、滑动和抗弯）之间的关键相互关系。接触、滑动和弯曲是许多生物力学和工程应用中最常见的疲劳模式。设计和合成G/A/G fgm，并对其疲劳性能进行研究以建立结构？{财产关系。可交付成果包括开发一系列新的女性生殖器切割工具及其制造新路线，更好地理解女性生殖器切割工具的结构和属性关系，研究成果的记录，研究生和本科生的教育，以及为代表性不足的少数民族高中学生提供的研究经验。如果成功，这项研究将导致下一代结构陶瓷的发展，这些陶瓷具有更好的抗损伤性，可用于人工关节、牙科假体、航空航天、军事、微电子和其他工程应用。提出的研究将扩展目前对女性生殖器切割材料疲劳行为的了解，并为设计一系列应用的女性生殖器切割材料提供指导。测试方法是将一个球加载到由柔顺基板支撑的扁平脆性层上，这是一种简单而有力的技术，用于阐明陶瓷的接触、滑动和抗弯曲损伤性。研究结果将被传播到生物医学、材料和工程文献中，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社区的新材料和设备创造新的场所。研究生、本科生和高中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.