Experimental Mechanics

, Volume 13, Issue 10, pp 422–432 | Cite as

The effect of strain rate and heat developed during deformation on the stress-strain curve of plastics

Temperature rise developed during deformation can have significant effects on the stress-strain relationship. Four hard plastics are tested at various strain rates, and temperature changes are measured during deformation of the specimen
  • S. C. Chou
  • K. D. Robertson
  • J. H. Rainey


Polymethylmethacrylate, cellulose acetate butyrate, polypropylene and nylon 6–6 have been characterized in compression at various strain rates from 10−4 s−1 to 103 s−1 at room temperature. A medium strain-rate machine and a split-Hopkinson-bar apparatus are used in conducting the experiments. The temperature rise developed during deformation is also measured by using a thermocouple. All four materials tested definitely show a viscous effect at the beginning of the deformation and a plastic flow follows thereafter. Test results also indicate that the temperature rise developed during deformation cannot be neglected in determining the dynamic response of those materials investigated in this study.


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  1. 1.
    Percy, J. H. and Meikle, J. B., “The Mechanical Behavior of Polymeric Solids in Compression,” Proc. of Conf. on the Sci. of Mat., Inst. Phys. and The Phys. Soc., Univ. of Auckland, New Zealand (Aug. 1969).Google Scholar
  2. 2.
    Kolsky, H., “An Investigation of the Mechanical Properties of Materials at Very High Rates of Loading,”Proc. Phys. Soc. 62B:676–700 (1949).Google Scholar
  3. 3.
    Back, P. A. A. and Campbell, J. D., “The Behavior of a Reinforced Plastic Material under Dynamic Compression,” Proc. Conf. on Properties of Mat. at High Rates of Strain, Inst. Mech. Engineer, Lond., 221–228 (1957).Google Scholar
  4. 4.
    Ripperger, E. A., “Stress-Strain Characteristics of Materials at High Strain Rates,” U. Texas Contract AT(29-2)-621 (for Sandia Corp.) (1958).Google Scholar
  5. 5.
    Volterra, E. andBarton, C. S., “An Impact Testing Machine for Plastics and Rubber-like Materials,”Proc. SESA,16 (1),157–66 (1958).Google Scholar
  6. 6.
    Ely, R. E., “High-Speed Compression Testing of Thermoplastics,”Symp. on Dyn. Beh. of Mat., ASTM Special Tech. Publs. No. 336, 15–33 (1963).Google Scholar
  7. 7.
    Tardif, H. P. andMarquis, H., “Some Dynamic Properties of Plastics,”Can. Aero. J.,9,205–13 (1963).Google Scholar
  8. 8.
    Davies, E. D. H. andHunter, S. C., “The Dynamic Testing of Solids by the Method of the Split Hopkinson Pressure Bar,”J. Mech. Phys. Solids,11,155–179 (1963).CrossRefGoogle Scholar
  9. 9.
    Lindholm, U. S., “Some Experiments with Split Hopkinson Pressure Bar,”J. Mech. Phys. Solids,12,317–335 (1964).CrossRefGoogle Scholar
  10. 10.
    Hoge, K. G., “The Effect of Strain Rate on the Mechanical Properties of General Purpose Polypropylene,” Univ. of California, Lawrence Radiation Laboratories, Report UCRL-14316 (1965).Google Scholar
  11. 11.
    Maiden, C. J. andGreen, S. J., “Compressive Strain Rate Tests on Six Selected Materials at Strain Rates from 10−3 to 104 Inch/Inch/Second,”TR65-26, General Motors Corp., G. M. Defense Research Laboratories, Santa Barbara, CA (1965).Google Scholar
  12. 12.
    Maiden, C. J. andGreen, S. J., “Compressive Strain Rate Tests on Six Selected Materials at Strain Rates from 10−3 to 104 Inch/Inch/Second,”ASME Trans., Series E, J. Appl. Mech.,33,496 (1966).Google Scholar
  13. 13.
    Holt, D. L., “The Modulus and Yield Stress of Glassy Polymethylmethacrylate at Strain Rates up to 103 Inch/Inch/Second,”J. Appl. Polym. Sci.,12,1653–1659 (1968).CrossRefGoogle Scholar
  14. 14.
    Dao, K. C. and Percy, J. H., “Polyethylene in Compression at Various Strain Rates and Temperatures,” Inst. Phys. and The Phys. Soc. Conf. Sci. Mat., Auckland, New Zealand (1969).Google Scholar
  15. 15.
    Meikle, J. B., “Relaxations in Nonequilibrium Glasses,” Inst. Phys. and The Phys. Soc. Conf. Sci. Mat., Auckland, New Zealand, 152 (1969).Google Scholar
  16. 16.
    Hall, I. H., “The Effect of Strain Rate on the Stress-Strain Curve of Oriented Polymers. II—The Influence of Heat Developed During Extension,”J. Appl. Polymer Sci.,12,739–750 (1968).CrossRefGoogle Scholar
  17. 17.
    Luntz, R. D., “System Control for a Hydraulic (Servo-Actuated) and Pneumatic Medium Strain Rate Tensile Testing Machine,” Dissertation for MS Degree in ME, Univ. of Utah, Salt Lake City, UT (June 1972).Google Scholar
  18. 18.
    Robertson, K. D., Chou, S. C. and Rainey, J. H., “Design and Operating Characteristics of a Split Hopkinson Pressure Bar Apparatus,” AMMRC, TR71-49 (Nov. 1971).Google Scholar
  19. 19.
    Clark, D. S. andWood, D. S., “The Time Delay for the Initiation of Plastic Deformation at Rapidly Applied Constant Stress,”Proc. ASTM,49,717–737 (1949).Google Scholar
  20. 20.
    Campbell, J. D. andMarsh, K. J., “The Effect of Grain Size on the Delayed Yielding of Mild Steel,”Phil. Mag.,7,933–952 (1962).Google Scholar
  21. 21.
    Jakob, M., Heart Transfer, II, Ch. 33, John Wiley and Sons, New York (1956).Google Scholar
  22. 22.
    Green, S. J., Griffin, R. M., Black, A. D. andLangan, J. J., “Tri-axial Stress-Strain Response of Polypropylene to High Pressure,”Terra Tek, Inc., Salt Lake City, UT, TR71-24 (July 1971).Google Scholar
  23. 23.
    Seeger, A., Dislocations and Mechanical Properties of Crystals, John Wiley and Sons, New York (1956).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1973

Authors and Affiliations

  • S. C. Chou
    • 1
  • K. D. Robertson
    • 1
  • J. H. Rainey
    • 1
  1. 1.Army Materials and Mechanics Research CenterWaterton

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