Nanomechanics and Interphase Chemistry of Interfacial Fracture

界面断裂的纳米力学和界面化学

• 批准号: 9978678
• 负责人: Robb Winter
• 金额: $ 44.21万
• 依托单位: South Dakota School of Mines and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9978678&HistoricalAwards=false
• 关键词: Nanomechanics; Interphase; Chemistry; Interfacial; Fracture

9978678WinterThe primary goal of this collaborative project between the South Dakota School of Mines and the University of Texas at Austin is to determine, with exquisite spatial resolution, the fundamental governing relations between interphase chemistry and fracture mechanics in composite polymer-substrate systems. This program will provide new understanding of the chemical nature and mechanical behavior of the interphase regions of selected composite materials prior to, during and following the passage of an interfacial crack. The new and substantive science/basic engineering that will emerge includes: i) Measurement of nanomechanical properties (stress-strain behavior) of the polymeric interphase region, cohesive zone/crack tip region, and pre- and post-fracture. ii) Intense and sophisticated spectroscopic, nanoscopic and fracture analysis of systems with controlled adhesive and cohesive properties. iii) Direct linkage of interphase properties to traction-separation laws obtained from cohesive zone models.Using complementary experimental and analysis tools, we will relate interphase chemistry and morphology and mechanical properties to traction-separation laws extracted from fracture experiments and finite element analysis. To accomplish the objectives we will apply a novel mixed-mode fracture technique, infrared (IR) and Raman spectroscopies, interfacial and atomic force microscopies, and monochromatic X-ray photoelectron spectroscopy (XPS), and time of flight secondary ion mass spectrometry (ToFSIMS).To facilitate interdisciplinary training, students will spend at least one month each year in the non-home institution laboratory and will discuss and debate results and plans regularly using video conferencing. Under-represented minorities will be encouraged to participate in this research enterprise.

南达科他州矿业学院和得克萨斯大学奥斯汀分校之间的这个合作项目的主要目标是确定，与精致的空间分辨率，复合聚合物基体系统的界面化学和断裂力学之间的基本支配关系。 该计划将提供新的理解的化学性质和选定的复合材料的界面区域的力学行为之前，期间和之后的界面裂纹的通道。 将出现的新的和实质性的科学/基础工程包括：i）聚合物界面区域、内聚区/裂纹尖端区域以及断裂前和断裂后的纳米机械性能（应力-应变行为）的测量。ii）对具有可控粘合和内聚特性的系统进行密集和复杂的光谱、纳米级和断裂分析。iii）界面性质与从内聚力模型获得的牵引分离定律的直接联系使用互补的实验和分析工具，我们将把界面化学和形态以及机械性质与从断裂实验和有限元分析中提取的牵引分离定律联系起来。 为了实现这些目标，我们将应用一种新的混合模式断裂技术，红外（IR）和拉曼光谱，界面和原子力显微镜，单色X射线光电子能谱（XPS）和飞行时间二次离子质谱（ToFSIMS）。学生每年至少有一个月的时间在非家庭机构的实验室，并将通过视频会议定期讨论和辩论结果和计划。 将鼓励代表性不足的少数民族参与这项研究事业。