Mechanics and Micromechanics of Interfaces and Joints

界面和接头的力学和微观力学

• 批准号: 9634632
• 负责人: John Hutchinson
• 金额: $ 34.75万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634632&HistoricalAwards=false
• 关键词: Mechanics; Micromechanics; Interfaces; Joints

9634632 Hutchinson This project is to study the micromechanics of interface adhesion and toughness with applications to thin films and multilayers. At the most fundamental level, the aim is to link interface separation at the microscopic level, the aim is to link interface separation at the microscopic level through the plastic zone to connect with macroscopic measures of interface toughness. The total work of fracture has been shown by experiments to be many times the atomic or molecular work of fracture. It is not uncommon for the plastic work of fracture to be all but a few percent of the total work of fracture of an interface. Amount the challenges addressed by the work are crack tip behavior at small scales linking to the fracture process. large scale yielding effects in films and layers, and mixed mode loadings. There is an increasing body of experimental evidence indicating that strain gradients at the micron to sub-micron level produce local hardening which exceeds that predicted by conventional plasticity formulations.

这个项目是研究薄膜和多层材料的界面附着力和韧性的微观力学。在最根本的层面上，目的是将微观层面的界面分离联系起来，目的是通过塑性区将微观层面的界面分离与界面韧性的宏观测度联系起来。断裂的总功已被实验证明是断裂的原子或分子功的许多倍。断裂的塑性功只占界面断裂总功的百分之几，这种情况并不少见。该工作所解决的挑战是与断裂过程相关的小尺度裂纹尖端行为。薄膜和层中的大规模屈服效应，以及混合模式加载。越来越多的实验证据表明，在微米到亚微米水平的应变梯度产生的局部硬化超过了传统塑性公式的预测。