Abstract
AbstractThe 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 $${\pm }$$
±
0.36) GPa for TMP and (2.51 $${\pm }$$
±
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.
Funder
Christian Doppler Forschungsgesellschaft
Mondi, Canon Production Printing, Kelheim Fibres, and SIG Combibloc
Graz University of Technology
Publisher
Springer Science and Business Media LLC
Reference37 articles.
1. Borodulina S, Kulachenko A, Tjahjanto DD (2015) Constitutive modeling of a paper fiber in cyclic loading applications. Comput Mater Sci 110:227–240
2. Christoph Peter (1951) Aufhängebänder. Archiv für. Technisches Messen J013–5:34–35
3. Courchene CE, Peter GF, Litvay J (2006) Cellulose microfibril angle as a determinant of paper strength and hygroexpansivity in Pinus taeda L. Wood Fiber Sci 38(1):112–120
4. Dai YJ, Huan Y, Gao M, Dong J, Liu W, Pan MX, Wang WH, Bi ZL (2015) Development of a high-resolution micro-torsion tester for measuring the shear modulus of metallic glass fibers. Measure Sci Technol 26(2)
5. Derek HP and Farouk EH (1983) The mechanical Properties of single wood pulp fibres: Part VI. Fibril angle and the shape of the stress-strain curve. J Pulp Paper Sci 9(4):TR99–TR100
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