Skip to main content

Advertisement

SpringerLink
Log in

Optimum Specimen Geometry for Accurate Tensile Testing of Superplastic Metallic Materials

  • Published:
Experimental Mechanics Aims and scope Submit manuscript

Abstract

The high temperatures and large strain limits associated with superplastic materials amplify the possibility of the tensile test outcomes being sensitive to the shape and size of the specimen geometry. In spite of that, the disparities in the specimen geometries used throughout the numerous efforts on characterising this unique class of materials are rather astonishing. There is an urge to evaluate the dependency of a superplastic tensile test on specimen geometry, before a much-needed universally-adopted standard specimen can be designed; which is the main objective of this comprehensive experimental investigation. More than 20 geometries, covering multiple variations in gauge length, gauge width, grip length and grip width values, are tested at identical conditions, and the corresponding material behaviour is compared in terms of deformation uniformity, material flow and the extracted stress/strain curves. The results reveal the influences of each geometrical parameter, as well as their combined effects, and guide the selection of an optimum specimen geometry for accurate and unified tensile testing of superplastic metallic materials.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Fig. 15

Similar content being viewed by others

References

  1. Verma R, Friedman P, Ghosh KS, Kim C (1996) Characterization of superplastic deformation behavior of a fine grain 5083 Al alloy sheet. Metall Mater Trans 27A:1889–1898

    Article  Google Scholar 

  2. Lee C, Huang J (2004) Cavitation characteristics in AZ31 Mg alloys during LTSP or HSRSP. Acta Mater 52:3111–3122

    Article  Google Scholar 

  3. Chino Y, Iwasaki H, Mabuchi M (2004) Cavity growth rate in superplastic 5083 Al and AZ31 Mg alloys. J Mater Res 19(11):3382–3388

    Article  Google Scholar 

  4. Watanabe H, Takara A, Somekawa H, Mukai T, Higashi K (2005) Effect of texture on tensile properties at elevated temperatures in an AZ31 magnesium alloy. Scr Mater 52:449–454

    Article  Google Scholar 

  5. Mukhopadhyay P, Biswas S, Chokchi A (2009) Deformation characterization of superplastic AA7475 alloy. Trans Indian Inst Met 62(2):149–152

    Article  Google Scholar 

  6. Liu J, Chen D, Chen Z, Yan H (2009) Deformation behavior of AZ31 magnesium alloy during tension at moderate temperatures. J Mater Eng Perform 18(7):966–972

    Article  Google Scholar 

  7. Abu-Farha F, Khraisheh M (2007) Analysis of superplastic deformation of AZ31 magnesium alloy. Adv Eng Mater 9(9):777–783

    Article  Google Scholar 

  8. Chang J, Taleff E, Krajewsky P (2009) Effect of microstructure on cavitation during hot deformation of a fine-grained aluminum-magnesium alloy as revealed through three-dimensional characterization. Metall Mater Trans 40A(13):3128–3137

    Article  Google Scholar 

  9. Hong Y, RongShi C, EnHou H (2009) Superplasticity of Mg-5.8Zn-1Y-Zr alloy sheet fabricated by combination of extrusion and hot-rolling processes. Sci China Ser E: Technol Sci 52(1):166–171

    Article  Google Scholar 

  10. Ma Y, Langdon T (1994) Factors influencing the exceptional ductility of a superplastic Pb-62 pct Sn alloy. Metall Mater Trans 25A(10):2309–2311

    Article  Google Scholar 

  11. Johnson K, Khaleel M, Lavender C, Pitman S, Smith J, Smith M, Hamilton C (1994) The effect of specimen geometry on the accuracy of constitutive relations in a superplastic 5083 aluminum alloy. Mater Sci Forum 170–172:627–632

    Article  Google Scholar 

  12. Johnson K, Khaleel M, Lavender C, Smith M (1995) Accuracy issues in modeling superplastic metal forming. Proceedings of the Annual Meeting of the Minerals Materials and Metals Society, Las Vegas, Nevada

  13. Bate P, Ridley N, Sotoudeh K (2008) Effect of gauge length in superplastic tensile tests. Mater Sci Technol 24(10):1265–1270

    Article  Google Scholar 

  14. Method for evaluation of tensile properties of metallic superplastic materials, JIS H 7501, 2002

  15. Standard test method for determining the superplastic properties of metallic sheet materials, ASTM E2448, 2005

  16. Method for evaluation of tensile properties of metallic superplastic materials, BS ISO 20032, 2007

  17. Khaleel M, Johnson K, Lavender C, Smith M, Hamilton C (1996) Specimen geometry effect on the accuracy of constitutive relations in a superplastic 5083 aluminum alloy. Scr Mater 34(9):1417–1423

    Article  Google Scholar 

  18. Abu-Farha F, Curtis R (2009) Quick-mount grips: towards an improved standard for uniaxial tensile testing of metallic superplastic sheets. Materialwiss Werkstofftech 40(11):836–841

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Penn State Erie, 5101 Jordan Road, 246 REDC Building, Erie, PA, 16563, USA

    F. Abu-Farha

  2. School of Technological Sciences, German-Jordanian University, Amman, Jordan

    M. Nazzal

  3. King’s College Dental Institute, King’s College London, London, UK

    R. Curtis

Authors
  1. F. Abu-Farha
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. M. Nazzal
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. R. Curtis
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to F. Abu-Farha.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Abu-Farha, F., Nazzal, M. & Curtis, R. Optimum Specimen Geometry for Accurate Tensile Testing of Superplastic Metallic Materials. Exp Mech 51, 903–917 (2011). https://doi.org/10.1007/s11340-010-9396-5

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11340-010-9396-5

Keywords

Search

Navigation