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Shear modulus of single wood pulp fibers from torsion tests

Cellulose (London), 2021-08, Vol.28 (12), p.8043-8054 [Peer Reviewed Journal]

The Author(s) 2021 ;The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 0969-0239 ;EISSN: 1572-882X ;DOI: 10.1007/s10570-021-04027-x

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  • Title:
    Shear modulus of single wood pulp fibers from torsion tests
  • Author: Dauer, M. ; Wolfbauer, A. ; Seidlhofer, T. ; Hirn, U.
  • Subjects: Bioorganic Chemistry ; Ceramics ; Chemistry ; Chemistry and Materials Science ; Composites ; Fibers ; Glass ; Kraft pulp ; Magnetism ; Moving coil ; Natural Materials ; Organic Chemistry ; Original Research ; Permanent magnets ; Physical Chemistry ; Polymer Sciences ; Sample holders ; Shear modulus ; Sustainable Development ; Torque ; Torsion tests ; Wood pulp
  • Is Part Of: Cellulose (London), 2021-08, Vol.28 (12), p.8043-8054
  • Description: The shear modulus of pulp fibers is difficult to measure and only very little literature is available on this topic. In this work we are introducing a method to measure this fiber property utilizing a custom built instrument. From the geometry of the fiber cross section, the fiber twisting angle and the applied torque, the shear modulus is derived by de Saint Venant’s theory of torsion. The deformation of the fiber is applied by a moving coil mechanism. The support of the rotating part consists of taut bands, making it nearly frictionless, which allows easy control of the torque to twist the fiber. A permanent magnet moving coil meter was fitted with a sample holder for fibers and torque references. Measurements on fine metal bands were performed to validate the instrument. The irregular shape of the fibers was reconstructed from several microtome cuts and an apparent torsion constant was computed by applying de Saint Venant’s torsion theory. Fibers from two types of industrial pulp were measured: thermomechanical pulp (TMP) and Kraft pulp. The average shear modulus was determined as (2.13 ± 0.36) GPa for TMP and (2.51 ± 0.50) GPa for Kraft fibers, respectively. The TMP fibers showed a smaller shear modulus but, due to their less collapsed state, a higher torsional rigidity than the kraft fibers.
  • Publisher: Dordrecht: Springer Netherlands
  • Language: English
  • Identifier: ISSN: 0969-0239
    EISSN: 1572-882X
    DOI: 10.1007/s10570-021-04027-x
  • Source: Springer Open Access Journals
    ProQuest Central
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