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4.1.2. Sample Calculation Calculation for HDPE/woven kenaf of 90/10 wt.%: 1) Vf=10wt.%=10%vol.% 2) Vm =90vol.% 3) σm=25MPa 4) σf=295MPa Tensile strength of composite σc: σc = σfVf + σmVm = (295)(0.1) + (25)(0.9) = 52 MPa From the calculation above, the theoretical tensile strength for different samples composition are tabulated in Table 4.2 as follows: Samples Neat HDPE 90/10 80/20 TABLE 4. 2. Matrix (wt. %) 100 90 80 Theoretical results. Kenaf (wt. %) 0 10 20 Tensile strength (MPa) 25 52 79 ` Figure 4.1 shows the relationship between the volume fraction of the kenaf fiber and the composites tensile strength. Assumption is made that the composites have perfect interfacial bonding between matrix and fiber. It is obviously shown that percentage of fiber is proportional with the tensile strength of the composites. As the fiber content increase, the tensile strength is increased as well. 18PDF Image | Woven Kenaf Reinforced High Density Polyethylene HDPE
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