caa a22 4500 463232143 CHVBK 20180405153245.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10853-006-1113-5 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1113-5 Dislocations in single hemp fibres—investigations into the relationship of structural distortions and tensile properties at the cell wall level [Elektronische Daten] [Lisbeth Thygesen, Michaela Eder, Ingo Burgert] The relationship between dislocations and mechanical properties of single hemp fibres (Cannabis sativa L. var. Felina) was studied using a microtensile testing setup in a 2-fold approach. In a first investigation the percentage of dislocations was quantified using polarized light microscopy (PLM) prior to microtensile testing of the fibres. In a second approach PLM was used to monitor the dislocations while straining single fibres. The first part of the study comprised 53 hemp fibres with up to 20% of their cell wall consisting of dislocations. For this data set the percentage of dislocations did not affect the mechanical properties. In the second part of the study it was found that dislocations disappeared during tensile testing, and that they did not reappear until several weeks after failure. A strain stiffening effect due to the straightening of the dislocations was not observed. It is possible that the former positions of the dislocations functioned as locations for crack initiation. However, the crack does not propagate transversely all the way trough the dislocation but results in a shear failure between the microfibrils. In rheological studies fibres were strained at constant stress levels, and dislocations that had disappeared did not reappear during that period. Springer Science+Business Media, LLC, 2006 Thygesen Lisbeth Department of Civil Engineering, Technical University of Denmark, Building 118, 2800, Lyngby, Denmark aut Eder Michaela Department of Biomaterials, Max-Planck-Institute of Colloids and Interfaces, 14424, Potsdam, Germany aut Burgert Ingo Department of Biomaterials, Max-Planck-Institute of Colloids and Interfaces, 14424, Potsdam, Germany aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/2(2007-01-01), 558-564 0022-2461 42:2<558 2007 42 10853 https://doi.org/10.1007/s10853-006-1113-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1113-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Thygesen Lisbeth Department of Civil Engineering, Technical University of Denmark, Building 118, 2800, Lyngby, Denmark aut NATIONALLICENCE 700 1- Eder Michaela Department of Biomaterials, Max-Planck-Institute of Colloids and Interfaces, 14424, Potsdam, Germany aut NATIONALLICENCE 700 1- Burgert Ingo Department of Biomaterials, Max-Planck-Institute of Colloids and Interfaces, 14424, Potsdam, Germany aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/2(2007-01-01), 558-564 0022-2461 42:2<558 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer