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    Volume 45, Issue 4 (July 2017)

    Complex Stress-Strain Relations of Tubular Materials Studied With a Flexible Hydroforming System

    (Received 3 February 2016; accepted 2 June 2016)

    Published Online: 20 July 2017

    CODEN: JTEVAB

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    Abstract

    Extruded aluminum alloy tubes present strong anisotropic properties, making its deformation very sensitive to stress states. To better characterize a proper constitutive relationship, the use of experimental stress-strain response with biaxial stress states would be more suitable than that of a common uniaxial test. To achieve this purpose, an attractive testing method and homologous experimental system (i.e., hydro-bulging system) were developed. Different proportional and non-proportional loading conditions could be performed with this experimental system. Hydro-bulging tests under three typical proportional loading paths were done. A fourth-order hardening model proposed by the authors was used to reproduce these experimental stress-strain relations and compared them with the results predicted using a power law relationship. Regression results predicted by the fourth-order hardening model had a good consistency with the distribution of experimental data. Deviations of the fourth-order hardening model are much less than that obtained by a power law. The maximum deviation introduced by the power function is at least 2.6 times greater than that introduced by the fourth-order function. Therefore, the use of a new regression model to treat experimental data would improve the predicting accuracy of a related constitutive relation efficiently and further ensure the predicting accuracy regarding a hydroforming simulation.


    Author Information:

    Lin, Y.
    School of Materials Science and Engineering, Harbin Inst. of Technology at Weihai, Weihai,

    Chu, G.
    School of Materials Science and Engineering, Harbin Inst. of Technology at Weihai, Weihai,

    He, Z.
    School of Materials Science and Engineering, Harbin Inst. of Technology, Harbin,

    Yuan, S.
    School of Materials Science and Engineering, Harbin Inst. of Technology, Harbin,

    Yan, Y.
    The State Key Laboratory of Robotics and Systems, Robotics Inst., Harbin Inst. of Technology, Harbin,


    Stock #: JTE20160067

    ISSN:0090-3973

    DOI: 10.1520/JTE20160067

    Author
    Title Complex Stress-Strain Relations of Tubular Materials Studied With a Flexible Hydroforming System
    Symposium ,
    Committee A05