Izod impact strength length

The notched Izod impact strength of the kenaf system is much lower than that of the glass fiber-filled PP but about the same as all other fillers and mica systems. Short fiber lengths present in the kenaf system due to the compounding system used and molding are probably responsible for the poor impact strengths [30]. 

Standard test methods for the determination of Izod impact strength are listed in Table 12.10. For example, ISO R180 normalizes the notch length. The velocity of the striker on impact has been standardized at 3.5 10 per cent m/s with impact energies of 1.0, 2.75, 5.5, 11.0 and 22.0 J. Four types of test pieces are permitted. 

Notched Izod impact strength tests have been conducted on the effect of fiber length in a nylon 6/6 compound reinforced with 50 wt% glass fiber. It shows that impact strength of reinforced TPs (RTPs) increases significantly, as fiber length is increased. Similar effects have been measmed with other fibers, such as aramid and carbon, and with other matrices, such as polypropylene and polyphenylene sulphide. 

Fibre length number average (mm) Fibres longer than 0.2 mm (%) Notched Izod impact strength (kj m- )... 

Additional data are shown in Figs. 2-19, -20, -21, -22, -23, -24, and -26 for flexural strength and heat-deflection temperatures of nylon 6/6, and Izod impact and heat deflection temperatures of polypropylene. See also par. 2-5.2 for discussion of critical fiber length. 

Fiber glass content (wt %) Vf Tensile strength (MPa) Notched Izod impact (J/m) Flexural strength (MPa) Flexural modulus (GPa) HOT 1.82 MPa (°C) Average fiber length, (mm) ave f f f... 

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