CAREER: Fundamental Research on Rotary Ultrasonic Machining of Dental Ceramic Materials

该学院早期职业发展（CAREER）奖的研究目标是测试旋转超声加工可以显着提高牙科陶瓷材料的加工表面和亚表面质量的假设。本论文将采用有限元分析和实验设计的方法，结合接触力学和断裂力学理论，研究材料去除和亚表面损伤的产生机理，解决复杂表面的加工问题，量化加工损伤，测量超声振幅，精度达到±0.1 μ m，并在此基础上，对材料去除和亚表面损伤进行了研究。揭示了超声振幅与亚表面损伤的关系。本职业建议的教育目标是加强在历史上黑人学院/大学制造业的教育计划。 具体做法包括将研究成果纳入现有的制造业课程;建立一个研究实验室;招聘非裔美国人研究生;开发多媒体课程以改善制造业教育;以及让本科生和K-12教师参与。如果成功的话，这项研究有望在牙科陶瓷制造领域带来突破性的创新，这将直接造福于国家。医疗消费者和社会。将为美国牙科行业提供创新的无裂纹精密加工技术。研究结果也将使生物陶瓷材料广泛应用的其他医疗行业受益，如骨和关节置换。本职业计划中的拟议教育活动将改善北卡罗来纳州农业和技术州立大学的工程教育，有助于提高授予非裔美国人的工程博士学位的比例，并扩大代表性不足的人口和非传统学生在工程研究中的参与。

The research objective of this Faculty Early Career Development (CAREER) award is to test the hypothesis that machined surface and subsurface quality of dental ceramic materials can be significantly enhanced by rotary ultrasonic machining. Approaches of finite element analysis and design of experiments combined with theory of contact mechanics and fracture mechanics will be employed to carry out the following research tasks: investigate mechanisms of material removal and subsurface damages generation; solve the problem of complex surface machining; quantify machining induced damages; measure ultrasonic vibration amplitude within accuracy ±0.1 micron; and discover the relationship between ultrasonic vibration amplitude and subsurface damages. The educational objective of this CAREER proposal is to enhance the education program in manufacturing at a Historically Black College/University. The specific approaches involve incorporating research results into existing manufacturing courses; developing a research laboratory; recruiting African American graduate students; developing multimedia courses to improve manufacturing education; and involving undergraduate students and K-12 teachers. If successful, the research is expected to bring about a breakthrough innovation in dental ceramic manufacturing, which will directly benefit the nation?s medical consumers and society. An innovative and crack-free precision machining technology will be provided for the US dental industry. The research results will also benefit other medical industries where bioceramic materials are widely used such as bone and joint replacements. The proposed education activities in this CAREER plan will improve engineering education at North Carolina Agricultural and Technical State University, contribute to increase the percentage of engineering doctorates awarded to African Americans, and broaden participation of underrepresented populations and non-traditional students in engineering research.