Abstract :
This research aimed to identify the effect of stirring speed on the tensile
strength and impact of hybrid composites. This study used a stirring speed of 660
rpm, 885 rpm and 1020 rpm. The materials used consist of rice husks coal
particles with a matrix Polyester Resin Yukalac 157 BQTN-EX and fiberglass
woven roving 600. The method used in composite making process was hand lay
up.
The results of the composite tensile tests showed that the lowest
resistance was at the stirring speed of 1020 rpm at 160,28 MPa and the highest
resistance at 885 rpm at 173,43 MPa. In the impact test, the lowest absorption
energy at a speed of 1020 rpm was 1,42 Joule and the highest resistance at a
stirring speed of 885 rpm was 2,64 Joules. In the SEM test results on composites
with 885 rpm stirring speed variations indicated voids due to air trapped within
the composite during the manufacturing process.