ABSTRACT：

  In this talk, the research contents, which are performed in the following several aspects in Tohoku University, Japan will be presented.

First, we will describe our recent work on the evaluation of mechanical and electrical properties of carbon nanotube reinforced composites. In this work, a computational structural mechanics model, which can effectively model the behaviors of carbon nanotubes under mechanical loads, is proposed. Also, a unit cell, which includes the plastic matrix, carbon nanotube and transition layer between carbon nanotube and matrix, is proposed for evaluating the mechanical properties of nano-composites. The properties of transition layer between carbon nanotube and surrounding matrix are determined by using the molecular mechanics and molecular dynamics. Finally, the mechanical properties of nano-composites can be effectively evaluated by using this unit cell. The proposed computational structural mechanics model for modeling the carbon nanotube has been also extended to the buckling analysis of carbon nanotubes. Finally. We will simply describe our recent on the evaluation of electrical properties of nano-composites.

Second, we will introduce our research work on the application of Lamb wave for the on-line and real time structural health monitoring. Besides many experimental investigations, a new numerical methodology for simulating the wave propagation in elastic media will also be reported. This method is proved that very small damages in structures can be accurately identified.

Third, we will describe our research work on simulation and evaluation of low-velocity impact induced damages in CFRP (carbon fiber reinforced plastic) materials. A new cohesive model is proposed for stably simulating the propagation of delamination in CFRP induced by impacts. Also, a stress-criterion is adopted for dealing with various kinds of in-plane damages, such as transverse cracks in matrix, matrix crushing and fiber failure. Through the experimental verification, this numerical model is proved to be very effective for evaluating the various damages in CFRP composites. Also, we will simply describe our recently developed system for the identification of impact loads on composites structures.

Brief Biography：

1991年：于重庆大学力学系获得固体力学专业博士学位

1991年-1993年：南京航空航天大学飞机博士后

1993年-1997年：日本东北大学航空工程系助教

1997年-1999年：清华大学工程力学系副教授

1999年-2000年：加拿大McGill大学机械系研究员

2000年-2002年：日本东北大学航空工程系副教授

2002年-2003年：美国Johns Hopkins大学机械系研究员