Tensile strength composites

Alloy Nominal composition, % Tensile strength, MPa " Yield strength, MPa " Elongation, % Electrical conductivity, MH-cm... 

Figure 3-48 Composite Tensile Strength versus Rber-Volume Fraction (After Kelly and Davies [3-26])...

Figure 3-50 Composite Tensile Strength versus Fiber-Volume Fraction (After Dow and Rosen [3 28])...

Composition Tensile Strength (MPa) % Strain At Break Elastic Modulus (MPa) Fracture p Energy (J/m3)... 

It is assumed that the maximum stress in the next fiber located at a distance dj away is approximately equivalent to the composite tensile strength, cr. It follows then that the damage zone size, cq, for aligned short fiber composites is given by (Lauke et al., 1985)... 

Figure 5.97 Plot of composite tensile strength versus fiber volume fraction for an aligned, short fiber-reinforced polymer matrix composite. The dotted lines show the corresponding values for continuous fibers for comparison purposes. Reprinted, by permission, from N. G. McCrum, C. P. Buckley, and C. B. Bucknall, Principles of Polymer Engineering, 2nd ed., p. 281. Copyright 1997 by Oxford University Press.

Combine your information to calculate the composite tensile strength assuming that Vf is a high value. 

Figure I. Composite tensile strength of thermo-plastics...

V/ = volume fraction of glass fiber lc = critical fiber length la = actual fiber length d = fiber diameter t = shear strength of matrix resin a = ratio of actual to critical fiber length fiber tensile strength... 

Table II. Equation Parameters for Composite Tensile Strength...

Figu re 10.7. Polystyrene/ HDPE composite tensile strength as a function of polystyrene content. 

As Figure 15.12 suggests, the composite tensile strength is mainly provided by the fibers, so, except for very low values of ( y, the critical stress at rupture can be approximated as... 

The fibres are surface treated during manufacture to prepare adhesion with the polymer matrix, whether thermosetting (epoxy, polyester, phenoUc and polyimide resins) or thermoplastic (polypropylene. Nylon 6.6, PMMA, PEEK). The fibre surface is roughened by chemical etching and then coated with an appropriate size to aid bonding to the specified matrix. Whereas composite tensile strength is primarily a function of fibre... 

Composition Tensile strength, MPa Notched Izod, J/m Flexural strength, MPa Melt flow index, g/10 min... 

Composite Tensile strength, psix KP (MPa) Flexural strength, psix icP(MPa) Flexural modulus, psix lOP(GPa)... 

Producer Name Composition Tensile strength (MPa) Tensile modulus (GPa) Density (g/crrF)... 

Figure 12.37. Effect of filler content on glass-fiber-PPO composite tensile strength. (Trachte and DiBenedetto, 1971.)...

Very recently, in our group, enhanced self-reinforced PP composites based on commercial PP fabrics were obtained by the film stacking method followed by compression molding introducing different contents of micron-sized quartz particles in the matrix films (unpublished results). Simultaneous improvements of composite tensile strength, ductility and fracture toughness were observed from the addition of quartz to the polymer matrix (Table 14.1). Enhanced degree of consohdation was obtained for the composites with quartz as evidenced from the improved mechanical properties and by SEM observations. This was also confirmed by acoustic emission analysis in situ in tensile tests. 

For many fiber-polymer systems (L/D) is in the range 10 50. From this analysis, it is evident that fiber length is important to the development of maximum tensile properties in the composite. It is also apparent that changes in the composite tensile strength are monotonically dependent on fiber concentration. 

Treatment type Lignin removal Single fibre tensile strength (MPa) Composites tensile strength (MPa)... 

Hornsby et al. [70] noticed improvement of tensile strength. Young s modulus, and impact resistance in composites PP—flax fibers containing 5% of the MAPP compatibilizer. Also, Kim et al. [71] noticed considerable improvement of PP/cotton fiber composite tensile strength when using the MAPP as a compatibilizer. 

HDPE/bamboo composites with different nanoclay and maleated polyethylene (MAPE) contents were fabricated by melt compounding. The compounding characteristics, clay dispersion, HOPE crystallization, and mechanical properties of the composites were studied. The X-ray diffraction (XRD) data showed that the clay was exfoliated only when 1% clay was added to pure HOPE wifliout MAPE. For HDPE/bamboo systems, MAPE was necessary to achieve clay exfoUatiOTi. For the HDPE/bamboo fiber composites, tensile strength, bending modulus, and strength were improved with the use of MAPE however, the use of the clay in the system led to reduced mechanical properties [27]. 

S. No Treatments Composite Tensile strength (MPa) Young s modulus (MPa) Elongation at break (%) Reference... 

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