Tensile behaviour

For the investigation of the time and the temperature dependence of the fibre strength it is necessary to have a theoretical description of the viscoelastic tensile behaviour of polymer fibres. Baltussen has shown that the yielding phenomenon, the viscoelastic and the plastic creep of a polymer fibre, can be described by the Eyring reduced time (ERT) model [10]. The shear deformation of a domain brings about a mutual displacement of adjacent chains, the... 

K. M. Prewo, F. Johnson, and S. Starrett, Silicon Carbide Fibre-Reinforced Glass-Ceramic Composite Tensile Behaviour at Elevated Temperature, J. Mater. Sci., 24, 1373-1379 (1989). 

As pointed out by Cansfield et al. the tensile behaviour of ultra high modulus polyethylene is very dependent on strain rate. A tensile strength of 1.5 GPa can therefore be obtained at high strain rates (similar to those adopted by Wu and Black) even for very low molecular weight polymers. 

This feature of the process is used in current research on composites and metal foams, both based on aluminium, to explore the relation between basic microstructural parameters and the mechanical performance of general two-phase isotropic materials. It is shown that materials with attractive properties can be produced, and that systematic relations can be established between microstructure and properties, for example between their microstructural scale and their tensile behaviour. 

M. Kouzeli, L. Weber, C. San Marchi, and A. Mortensen Corrigendum on the Tensile Behaviour of Infiltrated Alumina Particle Reinforced Aluminium Composites , Acta Mater., in print. 

Gommers B, Verpoest I. Tensile behaviour of knitted fabric reinforced composites. In Proceedings of the 10th international conference on composite materials (ICCMIO), vol. IV. Canada Whistler 1995. pp. 309—16. 

The c/c shear process already discussed was responsible for the high value of S44, and dominated tensile behaviour for specimens cut at 0 = 45°. Such a shear process does not involve contraction in the thickness direction, and so gave V21 (45°) close to zero. 

Gen Gensler, R., BegueUn, P., Plummer, C. J. G., Kausch, H.-H., Mtinstedt, H. Tensile behaviour and fracture toughness of poly (ether ether ketone)/poly (ether imide) blends. Polym. Bull. 37... 

Ramakrishna S, Hull D. Tensile behaviour of knitted carbon-fibre-fabric/epoxy laminates -part 1 experimental. Compos Sci Tech 1994 50 237-47. 

Fig. 4.7 Stress-strain behaviour of geotextiles (Non-linearity of tensile behaviour of geotextiles is not represented in these plots).

Table 4 Main features of the tensile behaviour of minicomposites determined from the force-deformation curves (Fj is proportional limit) and from SEM fractography (fiber pull out length Ip, crack spacing distance at saturation d,).

The different types of tensile behaviour seen in polymers are illustrated in Figure 1.31. 

Bacon R, Smith WH, Tensile behaviour of carbonized rayon filaments at elevated temperatures, Proc 2 Conf Industrial carbon and Graphite, SCI, London, 203, 1965. 

Miwa M, Mori Y, Takeno A, Yokoi T, Watanabe A, Compressive and tensile behaviour of carbon fibres, / Muter Sci, 33(8), 2013-2017, 1998. 

Baley C et al (2006) Transverse tensile behaviour of unidtrectional plies reinforced with flax fibres. Mater Lett 60(24) 2984-2987... 

Ghosh SK, Dey SK, Dey A (1988) Tensile behaviour and processing of bleached yam from pineapple leaf fibre. Indian J Text Res 13 17-20... 

Demir H, Balkose D, Ulku S (2006) Influence of surface modification of fillers and polymer on flammability and tensile behaviour of polypropylene-cranposites. Polym Degrad Stab 91 1079-1085... 

C. Baley, Analysis of the flax fibres tensile behaviour and analysis of the tensile increase. Compos. A 33, 2143-2145 (2002). 

P. Boisse, A. Gasser, and G. Hivet, Analyses of fabric tensile behaviour determination of the biaxial tension-strain surfaces and their use in forming simulation. Compos. A 32, 1395-1414 (2001). 

J. Moothoo, S. Allaoui, R Ouagne, and D. Soulat, A study of the tensile behaviour of flax tows and their potential for composite processing. Mater. Des. 55,764-772 (2014). 

H. Gu, Tensile behaviours of the coir fibre and related composites after NaOH treatment. Mater. Des. 30,3931-3934 (2009). 

The analysis of the tensile behaviour of these materials (Figure 7.7) resulted in the conclusion that the addition of NR to PLA matrices led to a drastic increase in the elongation at break from 5% for neat PLA to 200% for the blend. The optimal NR content to improve PLA brittleness was found to be 10 wt% since a further increase of the rubber content in the blend decreased the elongation at break to approximately 70% (Table 7.1). The addition of NR changed the common brittle fracture of neat PLA to ductile fracture with the formation and propagation of a neck while stretching and the yield fracture was suppressed. NR behaves as a stress concentrator... 

---