The most important characteristic of superplastic materials is the high sensitivity of flow stress to deformation rate. In general, a constant strain rate sensitivity index value is usually used for calibrating models describing superplastic deformation. However, experimental results indicate that the strain rate sensitivity index depends on strain rate, strain and does not remain constant during deformation. In this work, the effects of strain rate sensitivity variation on the stability of deformation during superplastic forming are examined using finite element simulations in conjunction with a microstructure-based constitutive model. The model is experimentally calibrated and validated for the AZ31 magnesium alloy. The results clearly show the importance of accounting for the variation of strain rate sensitivity in modeling and simulating superplastic forming.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    The effect of strain rate sensitivity evolution on deformation stability during superplastic forming


    Contributors:


    Publication date :

    2007


    Size :

    4 Seiten, 3 Bilder, 13 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Finite element modeling and optimization of superplastic forming using variable strain rate approach

    Nazzal, Mohammad A. / Khraisheh, Marwan K. / Darras, Basil M. | Tema Archive | 2004


    Fundamental questions concerning the application of superplastic forming and superplastic forming

    Friedrich, H. E. / Winkler, Peter Jürgen / Unternehmensbereich Apparate, Messerschmitt-Bölkow-Blohm GmbH (MBB), Ottobrunn | TIBKAT | 1991


    Superplastic forming of aluminum

    Naser,D.M. | Automotive engineering | 1987


    Superplastic Deformation of TC6 Alloy

    DING Ling / WANG Zhilu / SUN Qianjiang et al. | DOAJ | 2016

    Free access

    Superplastic deformation of alpha-sialon

    Gerretsen,J. / van Eijk,J.P. / TNO Road-Vehicle Research Inst.,Centre for Technical Ceramics,NL | Automotive engineering | 1991