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Research on the hydroforming law of variable cross-section shaped tubular automobile longitudinal arm

Li Jian, Li Yanjun, Liang Peng, Xie Guoan, Yang Jiachun, Shi Xianlin

Archives of Civil and Mechanical Engineering

2025

Vol. 25, no. 1

art. no. e3, 2025

In order to study the hydroforming simulation process of variable cross-section shaped tubular automobile longitudinal arm and the influence law of key factors on its forming quality, and to provide guidance for its engineering application. Firstly, the numerical simulation and experimental analysis of hydroforming are carried out on variable diameter tube with similar characteristics to the longitudinal arm hydroforming, and the correctness of the built finite element model and numerical simulation method is verified through experiments. Then, according to the structural characteristics of the automobile longitudinal arm parts, determine the longitudinal arm hydroforming process and the main molding parameters, and analyze the molding process by numerical simulation. According to the simulation results, the effects of hydroforming initial internal pressure, initial feeding, friction coefficient and shaping pressure on the wall thickness characteristics and shaping rules of the longitudinal arm are investigated, and the hydraulic expansion test of automobile longitudinal arm is carried out on the basis of the optimal loading path obtained. The results show that: in the case that the initial internal pressure does not reach the cracking pressure, the initial internal pressure and initial axial feeding has a greater impact on the wall thickness of the automobile longitudinal arm, reduce the friction coefficient can improve the material flow performance, improve the uniformity of the wall thickness of the parts, and appropriately increase the shaping pressure can improve the dimensional accuracy of the longitudinal arm molding and the molding quality. It is verified by experimental comparison that the whole process of automobile longitudinal arm forming simulation based on bending-hydraulic forming has high feasibility, and a relatively good loading path can be obtained to provide reference for practical engineering applications.

Adsorption and photocatalytic properties of toluene and Rhodamine B over TiO2-ZSM-5/ceramic fiber composite

Sun Pengfei, Zhang Wenrui, Zhang Yaqing, Dong Bingjun, Lei Yongchao, Zeng Dongjuan, Xin Zhenghao, Zhang Shengjia, Liang Peng

Environment Protection Engineering

2024

Vol. 50, nr 4

147--161

TiO2-ZSM-5/ceramic fiber composite was successfully prepared for the first time by impregnation and applied to remove toluene in the atmosphere and RhB in wastewater. Optional values for TiO2loading and calcination temperature were discussed. The composites were characterized by XRD, SEM, TEM, UV-vis and N2 adsorption-desorption. The results showed that TiO2loading amount affects the crystal formation, distribution, pore size and adsorption capacity for pollutants, which in turn determines the adsorption performance and photocatalytic activity of the composite. Composites calcined at 550 ℃ with 12.7 wt. % TiO2loading can degrade toluene and RhB most effectively, with the maximum degradation rates of 39.99% and 92.70%, respectively. In addition, materials have been proven to have high degradation stability being recycled 4 times. The TiO2-ZSM-5/ceramic fiber prepared in this study can degrade atmospheric and industrial wastewater pollutants. Therefore, TiO2-ZSM-5/ceramic fiber has high comprehensive practical value in the field of environmental pollutant removal.