Mechanical Performances of Twill Kenaf Woven Fiber Reinforced Polyester Composites

Natural fibres have been explored by many researchers. Natural fibres have the potential aspect to replace glass fibre in fibre-reinforced composites application. Kenaf is also one of the selected natural fibres that have bio resource profit regarding on their capability to absorb energy absorption especially. This study focused on the twill yarn kenaf woven composite structure. Composites were prepared using the hand lay-up method with different type of orientation each layered arrangement by Taguchi. The hardened composites were cured for 24 hours before it was shaped according to ASTM D3039. Taguchi method is used in this study for optimization which can reduce the time consumed rather than using experimental approach. The result shows orientations were significant on tensile and modulus strength performances. After optimizations, the values of tensile and modulus strength was 55.738 MPa and 5761.704 Joule, which is increasing 3.77% for tensile strength and 4.23% for Young modulus. By comparing fracture mechanism before and after optimizations, there was clear decreasing fracture surface. It indicated that, the mechanical behavior performances of the twill woven kenaf reinforced composites can be effectively improved by this method

Mechanical performances of twill kenaf woven fiber reinforced polyester composites

Natural fibres have the potential aspect to replace glass fibre reinforced composites. One of these fibers is kenaf. It is also one of the selected natural fibres that have bio resource profit regarding on their capability to absorb energy absorption especially. In order to prove the application of this fiber for the load-bearing application, the fiber in the form of yarn is weaved into fiber mat and reinforced with the plastic resin. This study focused on the twill yarn kenaf woven composite structure. Composites were prepared using the hand lay-up method with different type of orientation where the orientation is designed using Taguchi method. The hardened composites were cured for 24 hours in an ambient temperature before it was shaped according to ASTM D3039. The samples were then stressed uni-axially to obtain the stress-strain curves. The result shows the fiber orientations were significant factor in determining the performance of tensile strength. In this work, fiber mats are then optimized and the results showed that the values of tensile and modulus strength were 55.738 MPa and 5761.704 Joule, which is increased 3.77% and 4.23% for tensile strength and Young modulus, respectively. By comparing fracture mechanism before and after optimizations, there was clear decreasing fracture surface. It indicated that, the mechanical behavior performances of the twill woven kenaf reinforced composites can be effectively improved by this method

Mechanical strength of as-compacted aluminium alloy waste chips

This research is important to human being because a global reduction of CO2 emissions is becoming more and more important to prevent global warming caused by green-house gas production. So, recycling of aluminium alloy scraps is important to reduce energy consumption and also a reduction of CO2 emissions in manufacturing processes. The main purpose of this research is to determine the effect of Aluminium Alloy AA6061chips sizes and composition of polycarbonate on mechanical strength prepared by compaction process. Besides that, to investigate the effect of pressure and time compacted on mechanical properties. The research was conducted with different chips size, different composition of binder, different pressure and difference time throughout compacted process. Three difference chips sizes are selected which is 250, 500, and 710 µm, different pressure is 0.5, 1.0 and 2 tonne, meanwhile for different time compaction is 20, 30 and 40 minutes. From the result obtained, the highest strength showed by sample with chips size 250 µm and composition of polycarbonate 30 wt% with value 61.185 MPa. Furthermore for higher hardness also at the lowest chips size 250 µm and higher composition of polycarbonate 30 wt% with 167.752 HV. Meanwhile for the lowest values of strength and hardness are 6.7894 MPa and 72.2052 HV at chips size 710 µm and 10 wt% of polycarbonate. In this research, lower chip sizes, addition of composition polycarbonate, higher pressure and time compaction could improve the mechanical strength of Aluminium Alloy waste chips