Exploratory Research on the Fabrication of Specimens with Embedded State-Colored Cells

嵌入状态彩色细胞样本制作的探索性研究

• 批准号: 9705801
• 负责人: Zhen Chen
• 金额: $ 4.22万
• 依托单位: University of Missouri-Columbia
• 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: 1997-04-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705801&HistoricalAwards=false
• 关键词: Exploratory; Research; Fabrication; Specimens; Embedded

9705801 Chen Existing, experimental techniques can not provide a quantitative real-time measurement of the internal phase transition associated with localization under different loading, rates. Since localization is usually accompanied by local heating due to plastic work, an exploratory research project is proposed here to fabricate the experimental specimens with embedded state-colored cells to measure the real-time phase transition. It is proposed that the state-colored cells be made of a certain kind of thermochromic (TC) materials, the optical properties of which are able to chance reversibly upon temperature. Uniaxial compressive tests are then performed with these specimens to investigate the internal phase transition under different loading- rates. Because of the gel state of TC materials at certain temperature, it is possible that the ultimate cell for the proposed measurement may be composed of many smaller cells with a diameter of less than I mm, each covering a range of temperatures. With regard tot he actual measurement, it is anticipated that the cell will be subjected to radiation of the appropriate wavelength(s) to monitor the color change. The fabrication of the experimental specimens with embedded state-colored cells involves interdisciplinary efforts from chemistry, experimental mechanics, and material science. If the project is successful, however, there will be a significant impact on the modeling of localization, experimental mechanics and industrial applications.

现有的实验技术无法提供在不同载荷、速率下与局部化相关的内部相变的定量实时测量。由于局部化通常伴随着塑性工作的局部加热，因此本文提出了一个探索性的研究项目，即制作嵌入状态色细胞的实验样品，以测量实时相变。提出用一种光学性质随温度可逆变化的热致变色（TC）材料制备状态色电池。然后用这些试样进行了单轴压缩试验，以研究不同加载速率下的内部相变。由于TC材料在一定温度下的凝胶状态，因此有可能提出的测量的最终电池可能由许多直径小于1毫米的较小电池组成，每个电池覆盖一定的温度范围。在实际测量中，预计电池将受到适当波长的辐射，以监测颜色变化。嵌入状态着色细胞的实验样品的制作涉及化学、实验力学和材料科学的跨学科努力。然而，如果项目成功，将对本地化建模、实验力学和工业应用产生重大影响。