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The hydrostatic extrusion of polymethylmethacrylate

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Abstract

The hydrostatic extrusion behaviour of two grades of polymethylmethacrylate (PMMA) is reported and an analysis of the mechanics of the extrusion process is presented. Although the maximum degree of deformation achieved is considerably lower than that obtained for crystalline polymers, the process mechanics are controlled by the same factors (i.e. the billet-die friction, and the effects of strain rate and pressure on the material flow stress). A method for equating the effects of pressure and friction is described, following the work of Tabor on the adhesive mechanism of friction in polymers. This method gives a friction coefficient in the range 0.1 to 0.2 for the hydrostatic extrusion of PMMA, compared to values in the region 0.03 to 0.08 for crystalline polymers, suggesting conditions of boundary lubrication. The relatively high values of friction for PMMA are consistent with the requirement for careful preparation of the billet surface prior to extrusion, and the observation of the ″stick-slip″ phenomenon during extrusion. The differences between the grades of PMMA in both extrusion behaviour and tensile drawing behaviour are explicable in terms of their different glass transition temperatures.

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References

  1. A. Buckley andH. A. Long,Polymer. Eng. Sci. 9 (1969) 115.

    Google Scholar 

  2. K. Imada, T. Yamamoto, K. Shigematsu andM. Takayanagi,J. Mater. Sci. 6 (1971) 537.

    Google Scholar 

  3. T. Williams,ibid. 8 (1973) 59.

    Google Scholar 

  4. A. G. Gibson, I. M. Ward, B. N. Cole andB. Parsons,ibid. 9 (1974) 1193.

    Google Scholar 

  5. A. G. Kolbeck andD. R. Uhlmann,J. Polymer Sci. Polymer Phys. Ed. 15 (1977) 27.

    Google Scholar 

  6. A. G. Gibson andI. M. Ward,ibid. 16 (1978) 2015.

    Google Scholar 

  7. P. D. Coates andI. M. Ward,ibid. 16 (1978) 2031.

    Google Scholar 

  8. P. S. Hope, A. G. Gibson, B. Parsons andI. M. Ward,Polymer Eng. Sci. in press.

  9. P. S. Hope andB. Parsons,ibid. in press.

  10. P. S. Hope, A. G. Gibson andI. M. Ward,J. Polymer Sci., Polymer Phys. Ed. in press.

  11. S. Abdul Jawad andI. M. Ward,J. Mater. Sci. 13 (1978) 1381.

    Google Scholar 

  12. A. G. Gibson, D. Greig, M. Sahota, I. M. Ward andC. L. Choy,J. Polymer Sci. Polymer Lett. Ed. 15 (1977) 183.

    Google Scholar 

  13. J. M. Alexander andP. J. H. Wormell,Ann. C.I.R.P. 19 (1971) 21.

    Google Scholar 

  14. K. D. Pye, S. K. Bhatega andJ. A. Sauer, Proceedings of the NEL/AIRAPT International Conference on Hydrostatic Extrusion (NEL, Glasgow, 1973).

    Google Scholar 

  15. N. Kahar, R. A. Duckett andI. M. Ward,Polymer 19 (1978) 136.

    Google Scholar 

  16. P. S. Hope, A. G. Gibson andI. M. Ward, unpublished work.

  17. O. Hoffman andG. Sachs, ″Introduction to the Theory of Plasticity for Engineers″ (McGraw-Hill, New York, 1953).

    Google Scholar 

  18. B. Avitzur, ″Metal Forming: Processes and Analysis″ (McGraw-Hill, New York, 1968).

    Google Scholar 

  19. S. Maryama, K. Imada andM. Takayanagi,International J. Polymeric Mater. 1 (1972) 211.

    Google Scholar 

  20. Idem, ibid. 2 (1973) 105.

    Google Scholar 

  21. Idem, ibid. 2 (1973) 125.

    Google Scholar 

  22. A. G. Gibson, P. D. Coates andI. M. Ward, ″Science and Technology of Polymer Processing″ Edited by N. P. Suh and N. H. Sung, (M.I.T. Press, Massachusetts 1979).

    Google Scholar 

  23. P. D. Coates, A. G. Gibson andI. M. Ward,J. Mater. Sci. 15 (1980) 359.

    Google Scholar 

  24. P. S. Hope, R. A. Duckett andI. M. Ward,J. Appl. Polymer Sci., in press.

  25. H. Li. D. Pugh, ″Mechanical Behaviour of Materials under Pressure″, (Elsevier, Amsterdam, 1970).

    Google Scholar 

  26. J. S. Harris, I. M. Ward andJ. S. C. Parry,J. Mater. Sci. 6 (1971) 110.

    Google Scholar 

  27. P. D. Coates andI. M. Ward,J. Mater. Sci. 13 (1978) 1957.

    Google Scholar 

  28. P. I. Vincent,Polymer 1 (1967) 7.

    Google Scholar 

  29. A. S. Argon, in ″The Inhomogeneity of Plastic Deformation″, (A.S.M. Metals Park Ohio, 1973) ch. 7.

    Google Scholar 

  30. C. Bauwens-Crowet,J. Mater. Sci. 8 (1973) 968.

    Google Scholar 

  31. R. N. Haward andG. Thackray,Proc. Roy. Soc. A302 (1968) 453.

    Google Scholar 

  32. I. M. Ward,J. Mater. Sci. 6 (1971) 1397.

    Google Scholar 

  33. L. A. Davis andC. A. Pampillo,J. Appl. Phys. 42 (1971) 4659.

    Google Scholar 

  34. S. Rabinowitz, I. M. Ward andJ. S. C. Parry,J. Mater. Sci. 5 (1970) 29.

    Google Scholar 

  35. ″Handbook of Chemistry and Physics″ Edited by R. C. Weast (Chemical Rubber Publishing Co., Cleveland, 1973).

    Google Scholar 

  36. Manufacturers data.

  37. B. J. Briscoe andD. Tabor, in ″Polymer Surfaces″ Edited by D. T. Clark and W. J. Feast (Wiley-Interscience, New York, 1978) ch. 1.

    Google Scholar 

  38. Idem, J. Adhesion 9 (1978) 145.

    Google Scholar 

  39. B. J. Briscoe, private communication.

  40. P. B. Bowden andJ. A. Jukes,J. Mater. Sci. 3 (1968) 183.

    Google Scholar 

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Authors and Affiliations

  1. Department of Physics, University of Leeds, Leeds, UK

    P. S. Hope & I. M. Ward

  2. Department of Metallurgy and Materials Science, University of Liverpool, Liverpool, UK

    A. G. Gibson

Authors
  1. P. S. Hope
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  2. I. M. Ward
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  3. A. G. Gibson
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Hope, P.S., Ward, I.M. & Gibson, A.G. The hydrostatic extrusion of polymethylmethacrylate. J Mater Sci 15, 2207–2220 (1980). https://doi.org/10.1007/BF00552308

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