Development of a Full-Field Digital Stress Gradient Sensor for Failure Characterization of Transparent Structural Materials

开发用于透明结构材料失效表征的全场数字应力梯度传感器

• 批准号: 1232821
• 负责人: Hareesh Tippur
• 金额: $ 22.81万
• 依托单位: Auburn University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1232821&HistoricalAwards=false
• 关键词: Development; Full; Field; Digital; Stress

The research objective of this award is to develop a full-field, non-contact, optical technique to quantify angular deflections of light rays caused by non-uniform stress fields in optically transparent solids. The method exploits the elasto-optic effect in concurrence with the digital image correlation methodology to extract orthogonal stress gradients in transparent solids. The feasibility of the method to study failure behavior of solids under quasi-static and high strain rate loading conditions will be demonstrated using visible and near infrared radiation. The successful development of this new method will provide a powerful, complementary measurement tool for experimental solid mechanics. Optical transparency is a common characteristic of solids used in many engineering applications including electronic displays, automotive windshields, aircraft windows and canopies, hurricane resistant windows, and helmet visors. This research contributes towards understanding failure mechanics of such materials under quasi-static and stress wave loading conditions. Education and training of undergraduate and graduate students in interdisciplinary areas of optical metrology and mechanical characterization of structural materials is integral to this research. Findings from this research will be displayed during annual undergraduate and graduate recruitment events to attract K-12 and underrepresented students to engineering. The findings will also be integrated into graduate courses taught by the PI and disseminated through archival journals and conference publications.

该奖项的研究目标是开发一种全场，非接触式光学技术，以量化光学透明固体中由非均匀应力场引起的光线角偏转。该方法利用弹光效应与数字图像相关方法同时提取透明固体中的正交应力梯度。 该方法的可行性，研究准静态和高应变率加载条件下的固体破坏行为将使用可见光和近红外辐射证明。 这种新方法的成功开发将为实验固体力学提供一种强有力的、互补的测量工具。光学透明性是许多工程应用中使用的固体的共同特性，包括电子显示器、汽车挡风玻璃、飞机窗户和遮篷、抗飓风窗户和头盔护目镜。这项研究有助于了解准静态和应力波加载条件下，这种材料的破坏机理。 在光学计量和结构材料的机械表征的跨学科领域的本科生和研究生的教育和培训是不可或缺的这项研究。 这项研究的结果将在年度本科生和研究生招聘活动中展示，以吸引K-12和代表性不足的学生进入工程领域。 研究结果也将纳入PI教授的研究生课程，并通过档案期刊和会议出版物传播。