Journal of Materials Science

, Volume 16, Issue 2, pp 429–432 | Cite as

A mathematical relation between volume strain, elongational strain and stress in homogeneous deformation

  • Derk Heikens
  • S. Dirk Sjoerdsma
  • W. Jan Coumans


A model is presented for the volume strain of a two-phase blend which elongates homogeneously in a tensile test apparatus. In the case when only elastic deformation and crazing take place the volume strain against elongation curve can be constructed and calculated from the data of the stress-strain curve alone. When, as well as crazing and elastic deformation, shearing takes place, the data of the stress against elongation curve and the volume strain against elongation curve can be used to calculate the separate contributions of the three deformation mechanisms at any elongation. In principle, the model can be also used for any homogeneous system which deforms without necking and where one or more deformation mechanism is present.


Polymer Tensile Test Elastic Deformation Deformation Mechanism Test Apparatus 
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Copyright information

© Chapman and Hall Ltd 1981

Authors and Affiliations

  • Derk Heikens
    • 1
  • S. Dirk Sjoerdsma
    • 1
  • W. Jan Coumans
    • 1
  1. 1.Eindhoven University of TechnologyEindhovenThe Netherlands

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