Mechanics and Micromechanics of Interfaces and Joints

9634632哈钦森这个项目是研究应用于薄膜和多层膜的界面粘合和韧性的微观力学。 在最基本的水平上，目的是在微观水平上连接界面分离，目的是通过塑性区将微观水平上的界面分离与界面韧性的宏观测量相连接。 实验表明，断裂的总功是断裂的原子功或分子功的许多倍。 断裂塑性功几乎占界面断裂总功的百分之几是常见的。 这项工作所面临的挑战是小尺度下与断裂过程相关的裂纹尖端行为。膜和层中的大规模屈服效应，以及混合模式载荷。 有越来越多的实验证据表明，在微米到亚微米级的应变梯度产生局部硬化，这超过了传统的塑性公式预测。

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.