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Thermal stresses in aluminum 6061 and nylon 66 long fiber thermoplastic (LFT) composite joint in a tailcone

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Abstract

The present paper involves a metal/polymer joint in a tailcone in a kinetic energy penetrator (KEP), one of the ammunition types used by the military. It is currently made of aluminum 7075 alloy, which could be partly replaced by long fiber thermoplastic (LFT) composite. Two different types of aluminum insert geometries were considered, viz., beaded and threaded. Thermal stresses set in during cooling of the tailcone from the processing temperature mainly because of the difference in the values of coefficients of thermal expansion and differential cooling between the aluminum and the LFT composite. Finite element (FE) modeling was done to predict the temperature profile during the cooling of the tailcone from the processing temperature. FE results showed that the LFT composite part of the tailcone cooled faster than the aluminum insert. Experimental verification of this temperature profile was obtained by infrared (IR) thermography. Based on the temperature profile, thermal stresses at the metal/LFT composite interface were estimated using an FE model. Different magnitudes of thermal stresses were present at the aluminum/LFT composite interface owing to the nature of distribution of fibers around the insert. Magnitude of thermal stresses in the case of a beaded insert was approximately 2.5 MPa whereas in the case of a threaded insert, it was approximately 12 MPa.

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Notes

  1. www.plasticstechnology.com, as on 30 October 2006.

  2. www.rtpcompany.com, as on 30 October 2006.

  3. www.matweb.com, as on 30 October 2006.

References

  1. Lee HY, Qu J (2003) J Adh Sci Tech 17:195

    Article  CAS  Google Scholar 

  2. Chawla KK (1998) Composite materials, 2nd edn. Springer-Verlag, New York

    Google Scholar 

  3. Bartus SD, Vaidya UK (2005) Compos Struct 67:263

    Article  Google Scholar 

  4. Garner J, Bundy M, Newill J (1999) ARL-MR-445

  5. Rotheiser J (1999) Joining of plastics. Hanser Publisher, Munich

    Google Scholar 

  6. Williamson RL, Rabin BH, Drake JT (1993) J Appl Phys 74:1310

    Article  CAS  Google Scholar 

  7. Yao Q, Qu J (1999) ASME Mater Div Publ 88:25

    CAS  Google Scholar 

  8. Holman JP (1981) Heat transfer, 5th edn. McGraw-Hill Inc., New York

    Google Scholar 

  9. ANSYS, Release 8.0 (2002) ANSYS Inc., Canonsburg

  10. Toparli M, Sahin S, Ozkaya E, Sasaki S (2002) Comp & Struct 80:1763

    Article  Google Scholar 

  11. Ghafouri-Azar R, Mostaghimi J, Chandra S (2006) Com Mat Sci 35:13

    Article  CAS  Google Scholar 

  12. Keramidas GA, Ting EC (1976) Nucl Engg & Des 39:267

    Article  Google Scholar 

  13. Sunar M, Yilbas BS, Boran K (2006) J Mat Process Tech 172:123

    Article  Google Scholar 

  14. Astarita T, Cardone G, Carlomagno GM, Meola C (2000) Optics & Laser Tech 32:593

    Article  CAS  Google Scholar 

  15. Meola C, Carlomagno GM, Squillace A, Cardone G (2004) Infrared Phys & Tech 46:93

    Article  Google Scholar 

  16. Astarita T, Cardone G, Carlomagno GM (2006) Optics & Lasers Engg. 44:261

    Article  Google Scholar 

Download references

Acknowledgements

Authors gratefully acknowledge financial support from Army Research Lab (ARL), Contract # W911NF04-2-018. We thank National Composite Center (NCC) for making tailcones. Thanks are also due to Mr. Jason Styron from FLIR Systems for help with the thermography. We thank Mr. Anand Chevali for help in specimen preparation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The University of Alabama at Birmingham, 1530 3rd Ave S, BEC 254, Birmingham, AL, 35294, USA

    Rahul R. Kulkarni, Krishan K. Chawla & Uday K. Vaidya

  2. Army Research Labs, 4600 Deer Creek Loop, Aberdeen Proving Grounds, MD, 21005, USA

    James M. Sands

Authors
  1. Rahul R. Kulkarni
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  2. Krishan K. Chawla
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  3. Uday K. Vaidya
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  4. James M. Sands
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Correspondence to Krishan K. Chawla.

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Kulkarni, R.R., Chawla, K.K., Vaidya, U.K. et al. Thermal stresses in aluminum 6061 and nylon 66 long fiber thermoplastic (LFT) composite joint in a tailcone. J Mater Sci 42, 7389–7396 (2007). https://doi.org/10.1007/s10853-007-1840-2

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  • DOI: https://doi.org/10.1007/s10853-007-1840-2

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