{"title":"Research on the hydroforming law of variable cross-section shaped tubular automobile longitudinal arm","authors":"Jian Li, Yanjun Li, Peng Liang, Guoan Xie, Jiachun Yang, Xianlin Shi","doi":"10.1007/s43452-024-01062-w","DOIUrl":null,"url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 1","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Archives of Civil and Mechanical Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s43452-024-01062-w","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
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.
期刊介绍：
Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science.
The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics.
The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation.
In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.
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