Papers by Author: Duan Cai Yuan

Abstract: For the volume of the new prefabricated bridge with integral structure is huge and transportation and storage are difficult, scissors mechanism driven by hydraulic cylinder is presented to bridge design. Wth theoretical analysis, the position of the node, velocity and acceleration are analyzed. Using the ADAMS software, the whole model of deployable bridge section is established. The multi-body dynamic simulation of the whole model is studied. The simulation results are compared with those of theoretical analysis. The maximum error of them is 2.26%. The methods and conclusions are available for the design of developable bridge section.

Abstract: The plate rubber support is widely used in railroad bridge. To analyse its capability of transverse displacement resistance and increase its life-span, the finite element model of profiled plate rubber support is established by nonlinear finite element method. The influence of flex gradient of stiffened steel plate to the function of the plate rubber support is analyzed and the optimal gradient is obtained.The method and conclusions are available for designing of plate rubber support.

Abstract: The surface cracks are easy to occur in the solid missile motor grain. The solid missile motor grain with cracks is very dangerous when it is lunched, because the surface cracks might be propagation unstable when the internal pressure enters the surface cracks cavity. In order to analyze the surface crack of solid motor grain, with accelerated aging test, the variation law of mechanics properties of propellant in the storage period is obtained. Under internal pressure and axial acceleration loading, the three-dimension finite element models of the motor grain are established, three-dimension singular crack elements at the tips of surface cracks are established to simulate the cracks propagation. Along with the surface crack propagation, the stress intensity factors of the crack tips in different storage period are calculated to prejudge its stability respectively. The method and conclusions are available for using solid missile motor grain with surface cracks.