Authors: Jin Tian Wang, Shu Ying Qu, Xing Min Hou, Ao Tian Ju
Abstract: Collisions between over-high trucks and protection frame for height limit happen frequently, which seriously destroyed the railway infrastructure and affected the road traffic safety. Based on nonlinear software ANSYS/LS-DYNA, the collision process of over-high trucks and protection frame is simulated, and the failure mechanism of protection frame is analyzed respectively from deformation, stress, load etc. Load analysis results indicate that the maximum impact force is approximately direct proportional to the initial velocity, which can be used for choosing the collision load in the design. Stress analysis results indicate that the maximum stress usually occurs in the protection frame crossbar and joint area. Adding the diagonal bracing or increasing the crossbar thickness are the effective methods to improve the impact resistance capability of the protection frame.
1967
Authors: Liu Hong Chang, Chang Bo Jiang, Man Jun Liao, Xiong Xiao
Abstract: The explicit dynamic finite element theory is applied on the collision of ships with buoys for computer simulation. Using ANSYS/LS-DYNA finite element analysis software, the numerical simulation of the collision between the ton ship and the buoy with different structures and impact points. The collision force, deformation, displacement parameters and the weak impact points of a buoy are obtained. Based on the numerical simulation results, analysis of buoys and structural collision damages in anti-collision features are discussed, and several theoretical sugestions in anti-collision for the design of buoy are provided.
4455
Authors: Chuan Qing Wang, Wei Min Zhuang, Yan Hong Chen
Abstract: A new method is proposed to determine the maximum energy that absorbed by axial pressured thin wall tube. Three typical collision speeds are selected, which are low speed at 30km/h, medium speed at 60km/h and high speed at 90km/h. This paper also calculates the strain rates under different automotive collision conditions. Finite element software ABAQUS was used to investigate the effect of lightweight when circular thin wall tubes with different materials absorbing maximum and equal energy. The materials for thin wall tubes are high-strength steel, aluminum alloy and plain steel. The effect of lightweight of different material tubes in low strain rate, medium strain rate, and high strain rate can be obtained using the equal energy absorption strategy. The weight that reduced by high-strength steel tube and aluminum alloy tube is higher than that of plain steel tube, at all three strain rates.
2227
Authors: Tao Peng, Yan Han, Dong Zhai
Abstract: In this paper, the finite element model of river ice collision on the pier was established by adopting explicit dynamic analysis software package, LS-DYNA. And the finite element analysis model establishment methods for calculating the collision interaction forces between the river ice and flexible high pier were studied. The simplified constitutive model of river ice was proposed. Factors influencing the simulation of flow ice collision on piers were discussed including the meshing size of ice sheet, and the meshing size of pier in contact area, the contact type with related algorithms. The study show that Solid164 can be used to simulate the ice sheet and the contact area of pier; in terms of the model of collision effect between river ice and flexible high pier; automatic surface-to-surface contact type, ASTS, is the most appropriate; the river ice can be simplified as linear elastic material; rigid body can be used to connect the solid element and beam element. The conclusions drawn from this paper provide a new method for calculating the collision force between ice sheet and flexible high pier, which has a significant meaning in calculating the river ice collision forces theory.
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