Development of Micromechanical Stick-slip Model to Characterize the Damping Behaviors of Carbon Nanotube Composites

• Main Authors: Liu, Shou-Chi, 劉少淇
• Other Authors: Tsai, Jia-Lin
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/62197687947279012847

碩士 === 國立交通大學 === 機械工程學系 === 100 === This research aims to develop a micromechanical stick-slip model to investigate the damping property of carbon nanotube composites. By considering the slip-friction behavior between the CNTs and surround matrix, the energy dissipation mechanism in the composites was characterized in the analytical model. In addition, the effect of aspect ratio of CNTs, interfacial bonding strength, and interfacial friction on the damping behavior of composites were also accounted for in the study. It is noted that the amount of applied cyclic loading on the composites is also an essential factor on the damping behavior, which was also included in the investigation. In addition to the development of micromechanical model, the corresponding finite element analysis was employed to validate the accuracy of the model predictions. A cylindrical FEM model with embedded contract element on the interface between the CNTs and surrounding matrix was created to simulate the contact friction behavior of the CNTs composites. Furthermore, the slip length of the CNTs in the composites in terms of the applied loading was evaluated by comparing the interfacial stress to the interfacial strength through the iteration process. The analytical results and finite element results were then compared with each other. Moreover, the experimental data was also included in the model prediction.