Two contact models,the classical Coulomb contact model and the modified Coulomb contact model,are used in a fully coupled thermo-mechanical numerical model of friction stir welding, and the suitabilities of the two models to simulate the welding process are analyzed.

Based on the first-order shear deformation theory of the composite laminated plate,an FEA model and the method of free vibration analysis for the composite laminates with multiple through-width delaminations were developed,and a linearity contact model was established to simulate the interaction between upper and lower sub-laminates along the delaminated region during the vibration process.

Fractal surface was introduced into the average flow model and effect of elastic-plastic contact deformation of fractal surfaces on the flow factors and contact factor were analyzed based on the M-B fractal contact model for partial film lubrication.

In order to explore the application of atomic force microscopy(AFM)on biomedicine and obtain nanoscale real-time imaging of cytoskeleton in living cells,tapping mode and contact mode (two AFM operating modes) were used towards living rat cerebral microvessel endothelial cells(rCMECs).

Based on the theory of limit equilibrium of deformed body corresponding to the traditional theory of limit equilibrium of rigid-plastic body, the finite element contact simulation method is presented for computations of active earth pressures acting on L-shaped retaining walls with reduced friction coefficients of base bottoms.