tailieunhanh - Report Properties of plant fibre yarn polymer composites

Report "Properties of plant fibre yarn polymer composites" content presentation: Plant fibre structure, plant fibre water sorption, plant fibre mechanical properties, plant fibre processing, plant fibre com posites, materials and methods,. Invite you to consult. | BYG DTU Bo Madsen Properties of Plant Fibre Yarn Polymer Composites An Experimental Study TECHNICAL UNIVERSITY OF DENMARK DTU Report BYG DTU R-082 2004 ISSN 1601-2917 ISBN 87-7877-145-5 Summary The evolutionary history of plants means that the mechanical properties of their load-bearing elements . the plant fibres are highly optimised with respect to the mechanical requirements of plants. Moreover plant fibres themselves can be thought of as composite materials but with a structure far more complex than any man-made composites. Thus in addition to the attractive mechanical properties of plant fibres they might as well provide insight into form and function of a sophisticated composite material. The use of plant fibres as reinforcement in composite materials is finding increasing interest in the automotive and building industry and the properties of plant fibre composites have been addressed in numerous research studies. The work has so far mainly been focused on plant fibre composites with a random fibre orientation and therefore with moderate mechanical properties. To explore the full reinforcement potential of plant fibres requires however that the fibres are aligned. Presented in this study are experimental investigations of the properties of aligned plant fibre composites based on textile hemp yarn and thermoplastic matrices. The characteristics of textile hemp yarn have been investigated. The fibres are well separated from each other . only few fibres are situated in bundles. The twisting angle is low . about 15 for the outermost fibres in the yarn. The water sorption capacity of the fibres is much reduced in comparison to raw hemp fibres. Stiffness and ultimate stress of the fibres are estimated from composite data in the ranges 50-65 GPa and 530-650 MPa respectively. These findings show that textile hemp yarn is well suited as composite reinforcement. The volumetric interaction in aligned hemp yarn composites have been investigated. A model is .