By analyzing the deformation of —isotactic polypropylene through cyclic uniaxial compression at different temperatures—conclusions are drawn on the contribution of the crystalline phase and the amorphous phase to the hardening curve. The deformation of the crystalline phase, which deforms mainly by simple shear of the crystallites, strongly depends on the properties of the amorphous phase. A separation of strain in a relaxing and a quasipermanent part, as introduced by the work of Hiss et al. (1999, “Network Stretching, Slip Processes and Fragmentation of Crystallites During Uniaxial Drawing of Polyethylene and Related Copolymers,” Macromolecules, 32, pp. 4390–4403), is undertaken. By this experimental procedure it is possible to characterize the deformation dependence of several physical quantities such as Young’s modulus or the stored energy associated to each loading-unloading cycle. Furthermore specific transition strains, A, B, C, and D, can be determined where the recovery properties change. It is demonstrated that beyond point C the strain hardening can be described by the simple rubber hardening model of Haward (1987, “The Application of a Simplified Model for the Stress-Strain Curve of Polymers,” Polymer, 28, pp. 1485–1488).
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January 2009
Shear Behavior And Related Mechanisms In Materials Plasticity
Determination of Critical Strains in Isotactic Polypropylene by Cyclic Loading-Unloading
Florian C. Spieckermann,
Florian C. Spieckermann
Physics of Nanostructured Materials, Faculty of Physics,
e-mail: florian.spieckermann@univie.ac.at
University of Vienna
, Boltzmanngasse 5, 1090 Wien, Austria
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Harald R. Wilhem,
Harald R. Wilhem
Laboratory of Polymer Engineering,
LKT-TGM
, Wexstrasse 19-23, 1200 Wien, Austria
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Erhard Schafler,
Erhard Schafler
Physics of Nanostructured Materials, Faculty of Physics,
University of Vienna
, Boltzmanngasse 5, 1090 Wien, Austria
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Elias C. Alfantis,
Elias C. Alfantis
Laboratory of Mechanics and Materials, Polytechnic School,
Aristotele University of Thessaloni
, Thessaloniki 54124, Greece
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Michael J. Zehetbauer
Michael J. Zehetbauer
Physics of Nanostructured Materials, Faculty of Physics,
University of Vienna
, Boltzmanngasse 5, 1090 Wien, Austria
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Florian C. Spieckermann
Physics of Nanostructured Materials, Faculty of Physics,
University of Vienna
, Boltzmanngasse 5, 1090 Wien, Austriae-mail: florian.spieckermann@univie.ac.at
Harald R. Wilhem
Laboratory of Polymer Engineering,
LKT-TGM
, Wexstrasse 19-23, 1200 Wien, Austria
Erhard Schafler
Physics of Nanostructured Materials, Faculty of Physics,
University of Vienna
, Boltzmanngasse 5, 1090 Wien, Austria
Elias C. Alfantis
Laboratory of Mechanics and Materials, Polytechnic School,
Aristotele University of Thessaloni
, Thessaloniki 54124, Greece
Michael J. Zehetbauer
Physics of Nanostructured Materials, Faculty of Physics,
University of Vienna
, Boltzmanngasse 5, 1090 Wien, AustriaJ. Eng. Mater. Technol. Jan 2009, 131(1): 011109 (5 pages)
Published Online: December 23, 2008
Article history
Received:
January 28, 2008
Revised:
June 17, 2008
Published:
December 23, 2008
Citation
Spieckermann, F. C., Wilhem, H. R., Schafler, E., Alfantis, E. C., and Zehetbauer, M. J. (December 23, 2008). "Determination of Critical Strains in Isotactic Polypropylene by Cyclic Loading-Unloading." ASME. J. Eng. Mater. Technol. January 2009; 131(1): 011109. https://doi.org/10.1115/1.3030938
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