Photoelasticity and Its Synergism with Finite Element Method

光弹性及其与有限元法的协同作用

• 批准号: 9751315
• 负责人: Said Shakerin
• 金额: $ 1.15万
• 依托单位: University of the Pacific
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9751315&HistoricalAwards=false
• 关键词: Photoelasticity; Its; Synergism; Finite; Element

The goal of this project is to enhance mechanical engineering education by incorporating experiments in photoelastic stress analysis within the existing curriculum. Photoelasticity is a visual, full-field technique for determining stresses in parts and structures. In addition to its traditional use in industry, there is a renewed interest in using photoelasticity to test objects made by stereolithography. All mechanical (and to a lesser degree civil) engineering students can benefit from this project. Six new experiments are introduced in four courses: Mechanics of Materials, Machine Design, Instrumentation and Experimental Methods, and the Finite Element Method. Specific instructional objectives are to increase conceptual understanding of stress distribution through photoelastic visualization; gain experience with photoelasticity and its advantages/limitations; and appreciate the synergism between experimental and numerical methods of stress analysis. For the planned experiments, one transmission polariscope set, one reflection polariscope set, accompanying accessories, and a video capture device are needed. The equipment can also be used for in-class demonstrations, testing of senior design projects, and motivational presentations to K 12 students. Institutional support exists but is insufficient for the acquisition of these precision optical instruments. Overall, students experience that, in solving engineering problems, one has to choose the appropriate tool of analysis and recognize that quite often several tools must be utilized to validate the results, e.g., validation of numerical solutions by experimental means.

该项目的目标是通过在现有课程中加入光弹性应力分析实验来加强机械工程教育。光弹性是一种视觉、全场技术，用于确定零件和结构中的应力。除了在工业上的传统用途外，人们对使用光弹性来测试通过立体平版印刷制造的物体重新产生了兴趣。所有机械(土木工程)专业的学生都可以从这个项目中受益。在材料力学、机械设计、仪器与实验方法和有限元方法四门课程中开设了六个新实验。具体的教学目标是通过光弹性可视化增加对应力分布的概念性理解；获得光弹性及其优势/局限性的经验；以及欣赏应力分析的实验方法和数值方法之间的协同作用。对于计划中的实验，需要一套透射式偏光镜，一套反射偏光镜，以及配套的附件和视频捕获设备。这些设备还可以用于课堂演示、高级设计项目的测试，以及向K-12学生进行励志演示。机构支持是存在的，但不足以获得这些精密光学仪器。总体而言，学生们体验到，在解决工程问题时，必须选择适当的分析工具，并认识到通常必须使用几种工具来验证结果，例如，通过实验手段验证数值解。