Theoretical Analysis of Joint Friction

关节摩擦力的理论分析

• 批准号: 9903217
• 负责人: Joseph Walsh
• 金额: $ 9万
• 依托单位: Walsh Joseph B
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-15 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903217&HistoricalAwards=false
• 关键词: Theoretical; Analysis; Joint; Friction

9903217 Walsh Fractures are ubiquitous in Earth's crust, and range in size from micro-cracks to joints and tectonic faults. Their tectonic behavior under normal and shear loading has fundamental importance in seismology and tectonic studies. The PI proposes a theoretical analysis of slip between two rough surfaces that are loaded by normal and shear tractions. The two bodies are treated as elastic half -spaces, and the contact is nominally planar. The topography of the surfaces is Gaussian, simulating the statistical properties of samples from the laboratory and the field. As shear stress is increased, slip against Coulomb friction occurs at lightly loaded asperities, gradually spreading to contacts under higher normal stress. The PI has developed theory that describes the process mathematically and has applied it to the case where the contacts are widely spaced. These preliminary results show good agreement with published experimental data. This work will extend the theory to fualts where normal stress is high enough to cause complete contact.

9903217沃尔什裂缝在地壳中普遍存在，其大小从微裂缝到节理和构造断层不等。 它们在正常和剪切载荷下的构造行为在地震学和构造研究中具有重要意义。 PI提出了一个理论分析的两个粗糙表面之间的滑动，加载法向和剪切力。 两个物体被视为弹性半空间，接触名义上是平面的. 表面的地形是高斯的，模拟来自实验室和现场的样品的统计特性。 当剪应力增加时，在轻载微凸体处发生对抗库仑摩擦的滑动，逐渐扩展到在较高法向应力下的接触。 PI已经开发出了数学上描述该过程的理论，并将其应用于触点间距很大的情况。这些初步结果与已发表的实验数据吻合良好。 这项工作将把理论推广到法向应力高到足以引起完全接触的断层。