CAREER: Development of a Split-Beam Method for Improved Laser Machining of Ceramics

该学院早期职业发展(Career)奖支持致力于对单激光和双激光加工引起的热瞬变与最终导致过早骨折的复杂应力之间的关系进行数字建模的研究工作。概率断裂模型将与应力计算相结合，以帮助量化激光沿切割路径前进时的断裂时间和位置。生成的模型将用于激光加工实验，以开发和优化同时对表面进行评分的过程，以帮助控制最终骨折的路径和质量。将被研究的另一种有趣的方法涉及使用双激光将容易破裂的区域主动施加应力，使其处于热弹性压缩状态，以降低过早骨折的可能性。该研究计划还将有一个强大的教育组成部分，将通过有重点的外展努力为高中生和本科生提供实践研究经验。所有研究和不断发展的激光制造方法将使用华盛顿高等教育电信系统(WETS)和视频与华盛顿州立大学三个校区的课程整合。因此，新的方法将能够通过混合使用动觉和视觉方法来接触到各种不同的个人，其中包括大量的动手体验以及现场和视频演示。该项目的总体目标是开发更高效的陶瓷激光加工技术，同时帮助创造和培育工程和制造的积极形象。

This Faculty Early Career Development (CAREER) award supports research efforts focusing on numerically modeling the relationships between the thermal transients caused by single- and dual-laser machining and the complex stresses that ultimately lead to premature fractures. A probabilistic fracture model will be integrated with the stress calculations to help quantify the time and location of fracture as the laser progresses along the cutting path. The resulting models will then be used with laser machining experiments to develop and optimize a process of simultaneously scoring the surface to help control the path and quality of the final fracture. Another intriguing method that will be studied involves the use of the dual-laser to "actively stress" the fracture prone region into a state of thermoelastic compression to lower the probability of premature fracture. The research program will also have a strong educational component that will provide high school and undergraduate students with hands-on research experience through focused outreach efforts. All of the research and the evolving laser manufacturing methodology will be integrated with the curricula at three Washington State University campuses using the Washington Higher Education Telecommunications System (WHETS) and video. As a result, the new methodologies will be able to reach a wide variety of individuals by using a blend of kinesthetic and visual methods that include numerous hands-on experiences combined with live and video demonstrations. The overall goals of the project are to develop more efficient laser machining techniques for ceramics while at the same time helping to create and foster a positive image of engineering and manufacturing.