Transactions of Materials and Heat Treatment

Title：Mechanism of hydraulic expansion forming for bimetal composite tube 316L/X70

Authors： Tang Yue Ni Xingjian Wang Yongqin

Unit： Chengdu Aeronautic Polytechnic BAIC Yinxiang Automobile Co. Ltd.

KeyWords： bimetal composite tube hydraulic expansion forming contact pressure internal bulging pressure base tube liner tube

ClassificationCode：TH122

year,vol(issue):pagenumber：2018,43(1):90-96

Abstract：

In order to study the mechanism of hydraulic expansion forming for bimetal composite tube, the forming process of composite tube was divided into three stages: the elastic-plastic deformation of liner tube, the loading and unloading of base tube. Then, the relations of stress and strain of base tube and liner tube for three stages in the process of internal hydraulic pressure increasing gradually were analyzed by Tresca yield rule based on introducing the equivalent yield strength and considering the strain hardening phenomenon of liner tube, and the choice range of internal bulging pressure required by the tube compounding and the relationship between residual contact pressure and internal bulging pressure were obtained. Furthermore, the correctness of theoretical analysis on the contact pressure of base tube and liner tube in bulging process and the axial and circumferential strains at outer surface of base pipe was verified by the finite element analysis and forming experiments of composite tube. Thus, the effective guidance could be provided by theoretical analysis and numerical simulation when designing the compound forming process of metal tube.

Funds：

作者简介：唐越（1989-），男，硕士，助教，E-mail：tangyue_2006@126.com

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