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Especially, the fibres\u2019 viscoelastic properties are having an influence on the product performance.<\/jats:p><jats:p>In this work, tensile testing at different strain rates was performed on single fibres to investigate the rate dependence of their moduli. Four different fibre types were tested: chemi-thermomechanical softwood pulp (CTMP), bleached chemical softwood pulp (CP), unbleached softwood kraft pulp (UKP), and viscose (VIS). For each fibre sample, ten strain rates ranging from 0.113%\u00a0s<jats:sup>\u22121<\/jats:sup> to 800%\u00a0s<jats:sup>\u22121<\/jats:sup> were applied. The rate-dependent modulus <jats:inline-formula><jats:alternatives><jats:tex-math>$$E_{r}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msub>\n                    <mml:mi>E<\/mml:mi>\n                    <mml:mi>r<\/mml:mi>\n                  <\/mml:msub>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> of each fibre at each strain rate was calculated by linearly fitting the stress\u2013strain curves. By obtaining the values of the normalized modulus, a slope value per decade was calculated to quantify the rate dependence. To exclude possible plastic and relaxation effects, two additional experiments were used: a force-controlled loading\u2013unloading experiment and a reverse rate protocol.<\/jats:p><jats:p>All cellulosic fibres tested exhibited rate-dependent behaviour with a log-linear relationship between loading rate and modulus. For each tenfold increase in loading rate we found an increase in modulus up to nearly 20%\u2014depending on the fibre type. Viscose fibres exhibit the highest rate dependence, whereas chemical softwood pulp fibres exhibit the lowest.<\/jats:p>","DOI":"10.1007\/s10853-022-07722-7","type":"journal-article","created":{"date-parts":[[2022,9,22]],"date-time":"2022-09-22T21:02:36Z","timestamp":1663880556000},"page":"17517-17529","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["The effect of the strain rate on the longitudinal modulus of cellulosic fibres"],"prefix":"10.1007","volume":"57","author":[{"given":"Marko","family":"Zizek","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caterina","family":"Czibula","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1376-9076","authenticated-orcid":false,"given":"Ulrich","family":"Hirn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,9,22]]},"reference":[{"key":"7722_CR1","doi-asserted-by":"publisher","first-page":"252","DOI":"10.1038\/229252a0","volume":"229","author":"DH Page","year":"1971","unstructured":"Page DH, El-Hosseiny F, Winkler K (1971) Behaviour of single wood fibres under axial tensile strain. 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