KEKUATAN BENDING KOMPOSIT SANDWICH SERAT GELAS DENGAN CORE DIVINYCELL-PVC H-60 (PENGARUH ORIENTASI SERAT, JUMLAH LAMINAT DAN TEBAL CORE TERHADAP KEKUATAN BENDING)
Abstract: This study
aims to investigate
the effect of
fiber orientation to
bending strength of GFRP (Glass Fiber Reinforced Plastic) composite and
the effect of laminates number and
core thickness to
bending properties of
GFRP sandwich composite with
divinycell-PVC core type H-60.
The composites were produced by
using a press mold method for 40% of fiber volume fraction (vf). The GFRP
composite specimen consists of 4 laminates – woven roving glass fiber,
varied by fiber
orientation as [(0/90)4],
([((30/-60)/(60/-30))2], [{(45/-45)4}],
[{(30/-60)/(0/90)}2], and [{(45/-45)/(0/90)}2]). The
GFRP composite whose the
highest bending strength
was used as skin
of the sandwich composite.
The variables of the sandwich
are laminates number (2L, 4L, 6L, 8L) and core thickness
(5, 10, 15, 20 mm). According to ASTM D-790
and ASTM C-393,
the GFRP and
sandwich composite specimens were tested by using three point bending
method. The result shows that the GFRP composite, reinforced
by [(0/90)4] of
fiber orientation, has
the highest bending strength
(226.62 MPa) compared
to others, and
it’s failure is dominated
by interlaminate delamination.
For GFRP sandwich
composite with 10 mm of core thickness, the maximum moment capacity
increases a long with the increasing
of laminates number.
However, the highest
bending strength is achieved
on the sandwich
composite with 4 laminates
of glass fiber. All specimens
shows core shear failure model. And then, for sandwich composite with
skin 4 laminates,
the increasing of
core thickness also increases moment capacity consistenly,
but it decreases the bending strength significantly. Similarly, the decreasing
of core shear strength also happens on the specimen. On the specimen occours
core shear and indentation of failure types.
Penulis: Kuncoro Diharjo
Kode Jurnal: jptmesindd110010
