Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 56, Issue -, Pages 319-327Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2012.11.019
Keywords
Hemp fibres; Mechanical properties; Mechanical testing
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The aim of this study is to achieve a better understanding of the nonlinear tensile behaviour of the elementary hemp fibre. This is of great importance in view of the need to develop an efficient predictive tool for the design of natural fibre reinforced composites. This first paper investigates the possible mechanisms responsible for the nonlinear behaviour, using repeated progressive tensile loading with in situ polarised light microscopy. The persistence of residual strain has been confirmed during testing when the tensile load was released. Only a certain fraction of this residual strain is reversible, and the reversibility is time-dependent. Beyond the yield level, the fibre's rigidity is not deteriorated, but significantly increased as a function of the number of loading cycles and the level of strain. A new scenario involving a stick-slip mechanism, extension and re-orientation of the microfibrils and shear strain-induced crystallisation of the amorphous cellulose is proposed. (C) 2012 Elsevier Ltd. All rights reserved.
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