Crashworthiness Analysis And Compliance Research Of The Pro-folded Tube

The metal thin-walled structures,which has the advantage of high strength weight ratio, low-cost, high-energy absorption efficiency and simple machining, as the main component of the dissipation of impact energy in collisions such as emergencies, is widely used in automotive, ship, train, aviation and other modes of transport as well as mechanical, civil, bridges, and other aspects. To design a lightweight and efficient thin-walled energy absorption component with good crashworthiness is of great practical significance for the protection of people’s lives and property safety, energy conservation, and promotion of environmental protection. Inspired by the "rigid origami", a new type of energy absorption tube with folded pattern(the pro-folded tube) is proposed in this paper. Then we use the theoretical analysis, numerical simulation and experiment to study the crashworthiness and compliance of the pro-folded tube. The specific research are as follows:1. First of all, the geometry characteristics of the pro-folded tube are introduced. Based on the ANSYS/LS-DYNA finite element software, numerical analysis is done for ordinary tube and the pro-folded tube. Through comparing the numerical results, we can get that the pattern introduced in the wall can effectively reduce the initial peak force and improves the efficiency of energy absorption. In addition, the sensitivity of the key geometric parameters, also some other parameters, to influence the efficiency of energy absorption is researched. For details, see in Chapter2.2. Quasi-static experiment and low-speed impact test are used to verify the effect of the energy absorption of the pro-folded tube. Experimental results show that the pattern introduced in the wall can effectively reduce the initial peak load, while increasing the energy absorption efficiency of thin-walled tube. At the same time, we can get the impact of the production process on the deformation mode and energy absorption effect of the pro-folded tube. For details, see in Chapter3.3. The research on the compliance of the pro-folded tube, as well as the influence of the geometric dimensions to the compliance is done. Also the relationship between compliance with the maximum energy absorption of the pro-folded is researched. In some cases, while the pro-folded tube is exactly submit to the pattern, the energy absorption is maximum. For details, see in Chapter4.