caa a22 4500 605466319 CHVBK 20210128100306.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00397-014-0811-1 doi (NATIONALLICENCE)springer-10.1007/s00397-014-0811-1 Rheological properties of a straw layer [Elektronische Daten] [Ryszard Myhan, Ewelina Jachimczyk] The experiment was performed on a layer of straw whose thickness was equivalent to the load of 4kgm−2. Every straw sample was subjected to 15 strain cycles. A preliminary analysis of the results revealed that compression and decompression curves resemble the proper rational function, where selected parameters of that function were determined by the direction of strain and the number of strain cycles. Straw was described with the use of a rheological model where it was divided into layers subjected to elastic strain and internal friction proportional to the rate of displacement and deformation. Unknown model parameters were estimated based on an analysis of the equation describing the results of the experiment and the results produced by the model simulating the rheological properties of straw. The elastic modulus was directly proportional to load, and its value decreased in successive strain cycles. Internal friction was determined based on the loss of mechanical energy. In fluid dynamics, internal friction is associated with viscosity, whereas in fibrous materials such as straw, mechanical energy is lost mainly due to sliding friction. The losses were minimized in successive strain cycles. Springer-Verlag Berlin Heidelberg, 2014 Straw layer nationallicence Model nationallicence Rheological properties nationallicence Myhan Ryszard Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 2, 10-719, Olsztyn, Poland aut Jachimczyk Ewelina Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 2, 10-719, Olsztyn, Poland aut Rheologica Acta Springer Berlin Heidelberg 54/1(2015-01-01), 19-27 0035-4511 54:1<19 2015 54 397 https://doi.org/10.1007/s00397-014-0811-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-014-0811-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Myhan Ryszard Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 2, 10-719, Olsztyn, Poland aut NATIONALLICENCE 700 1- Jachimczyk Ewelina Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 2, 10-719, Olsztyn, Poland aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/1(2015-01-01), 19-27 0035-4511 54:1<19 2015 54 397