PENGARUH VARIASI KETEBALAN CORE TERHADAP KARAKTERISTIK BENDING KOMPOSIT SANDWICH SERAT CANTULA DENGAN CORE HONEYCOMB KARDUS TIPE KOMBINASIC-FLUTE DAN A-FLUTE

Abstract

The purpose of this research is to investigate the effect of the variation of core thickness on strength bending characteristic of cantulas’ fiber sandwich composite  with the type combination C-Flute and A-Flute of cardboard honeycomb core.         Cantulas’ fiber is used to make the skin by applied it in the same way and get alkali ( 2% NaOH ) in 6 hours. Hand  lay up method  is used in the production process by using fraction 40:60 resin BQTN 157 with the thickness of skin 4 mm. in  making  the combination between C-Flute and A-Flute core honeycomb used Horisontal Gelombang Dua arah ( HGD ) method  with the variation of the core thickness 10 mm, 20mm, and 40 mm. then , adhesive epoxy versamid 140 is used to glue between skin and core.  the mechanical test is conducted using bending test according to ASTM C 393 standart.  the failure observation of the bending test is done by makro photo. The result shows that the variation of core thickness influence the  strength of bending sandwich cantulas’  fiber  sandwich composite  with the type combination C-Flute and A-Flute of cardboard honeycomb core . the maximum weight of the bending sandwich composite is in the 10 mm of the core thickness with the value 14,800 MPa,  on  core shear stress and facing bending stress is in the 10 mm of the core thickness with the value 0,634 MPa and 14,271 MPa. the pattern of failure is  in the core failure, delaminasi, deformasi and in  the skin is causes of  load tensile.