Composites fibre length, influence

Thomason, J.L. Vlug, MA. (1996). Influence of Fibre Length and Concentration on the Properties of Glass Fibre-reinforced Polypropylene 1. Tensile and Flexural Modulus. Composites Part A Applied Science and Manufacturing, Vol.27, No.6, pp. 477-484 ISSN 1359-835X... 

Mieck KP, Reubmann T (1995) Flachs versus Glas. Kunststoffe 85 366-370 Heijenrath R, Peijs T (1996) Natural-fibre-mat-reinforced thermoplastic composites based on flax flbres and polypropylene. Adv Compos Lett 5 81-85 46. Peijs T, Garkhail S, Heijenrath R, Van den Oever M, Bos H (1998) Thermoplastic composites based on flax flbres and polypropylene influence of fibre length and fibre volum fraction on mechanical properties. Macromol Symp 127 193-203... 

Beg MDH, Pickering KL (2008) Mechanical performance of kraft fibre reinforced polypropylene composites influence of fibre length, fibre beating and hygrothermal ageing. Compos A 39 1748-1755... 

M. Pervaiz, M. Sain, and A. Ghosh, Evaluation of the influence of fibre length and concentration on mechanical performance of hemp fibre reinforced polypropylene composite. 7. Nat. Fibers 2, 67-84 (2006). 

JL Thomason, MA Vlug. The influence of fibre length and concentration on the properties of glass fibre-reinforced polypropylene. Part 1. Tensile and flexural Modulus. Composites A 27 477-484, 1996. 

A. K. Bledzki, O. Faruk, and A. A. Mamun, Influence of compounding processes and fibre length on the mechanical properties of abaca fibre-polypropylene composites. Polimery 53, 120 (2008). 

The influence of fibre length is illustrated in Figure 10.14 where composites with continuous rovings are compared with those with short length rovings (injection moulded components). 

The ultimate strength of a composite of fibre and polymer is basically dependent upon the stress-strain relationship of its components. Any fibre whose strength and modulus of elasticity is greater than a polymer is capable of theoretically providing reinforcement to that polymer. Practically, however, the difference in properties has to be considerable to obtain efficient reinforcement and the effectiveness of the reinforcement is dependent upon the degree of adhesion which can be achieved. Other factors which also influence the properties of a composite are relative volumes of reinforcement and matrix, their physical and chemical properties, the temperature resistance and, of very considerable importance, the fibre length which is being used. 

In the preparation of these composites, special attention is required to avoid non-uniform fibre distribution. Yet, because of the nature of the preparation of the preplaced bed, there is a tendency for preferred orientation, which depends on the size of the mould relative to the fibre length, and the method of placement. The effect of orientation can have a considerable influence on the properties (F igure 12.6) [23]. The type and size of the steel f i bres may also affect the properties of the composite [23]. 

For evaluation of the mechanical properties, which are foimd in Table 1, the fibre lengths in the composite, acquired from the fibre scans, have been used. While the elastic modulus (Table 1) is not influenced through the fibre lengths in the investigated regions, tensile... 

Further, the rule of mixture type models can be applied for estimating tensile and notched impact strength of sisal fibre reinforced composites. The agreement of the two simple models is good for evaluating the influences of fibre length and content. 

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