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Stress relaxation in physically nonlinear polymer materials under simultaneous tension and torsion

  • Plasticity, Creep, And Rheology Of Solids
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Polymer Mechanics Aims and scope

Conclusions

1. Application of our method of determining the parameters of physically nonlinear polymer materials from tests in uniaxial tension or in torsion ensures a satisfactory agreement between theoretical and experimental stress-relaxation curves corresponding to other modes of loading.

2. Theoretical stress-relaxation curves for shear (tension) calculated on the basis of parameters which have been determined from approximations of stress-relaxation curves for tension (torsion) fall closely within the confidence interval for an individual measurement (with α=95%).

3. The agreement between theoretical and experimental stress-relaxation curves for a plane state of stress is 2–3 times worse, in terms of the mean-square relative difference, than the agreement between the respective curves for uniaxial tension.

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Literature cited

  1. M. R. Kilevits, Ya. Ya. Indulevich, and P. N. Adavich, “Experiment automating system for study of viscoelastic materials during momentary stress relaxation” Mekh. Polim., No. 1, 149–153 (1976).

  2. A. F. Kregers and M. R. Kilevits, “A study of stress relaxation in physically nonlinear polymer materials under tension” Mekh. Polim., No. 6, 1103–1107 (1976).

  3. A. F. Kregers and U. K. Vilks, “Approximation of the family of creep curves for physically nonlinear polymer materials on a computer” Mekh. Polim., No. 2, 220–229 (1976).

  4. P. M. Ogibalov and A. F. Kregers, “Deformation of polymer materials (Survey)” Mekh. Polim., No. 3, 413–421 (1977).

  5. A. F. Kregers, “An algorithm for seeking the minimum of a multivariate function by the descent method” Algor. Programmy, No. 2, 9 (1974).

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Authors
  1. M. R. Kilevits
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  2. A. F. Kregers
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Additional information

Institute of Polymer Mechanics, Academy of Sciences of the Latvian SSR, Riga. Translated from Mekhanika Polimerov, No. 5, pp. 797–803, September–October, 1977.

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Kilevits, M.R., Kregers, A.F. Stress relaxation in physically nonlinear polymer materials under simultaneous tension and torsion. Polymer Mechanics 13, 666–671 (1977). https://doi.org/10.1007/BF00860315

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  • DOI: https://doi.org/10.1007/BF00860315

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