8/3/2019 Efisiensi Reparasi Resin Infused Scarf Struktur
Komposit_Marine Transport_Palaniappan_Jayanthi
1/1
Repair e fficiency of resin infused scarfrepaired com posite
structures
Dr.Jayanthi Palaniappan- [email protected] - School of
Engineering Sciences
Supervisors Prof. A.Shenoi, Dr. S.Boyd, Prof. J. Mawella
(Ministry of Defence)
FLUID STRUCTURE INTERACTIONS
RESEARCH GROUP
Background
Composite materials have been increasingly adopted in
marineindustries such as for patrol boats, mine counter measure
vessels, hovercrafts etc. The composite materials in these
vesselsundergo damage during service and any permanent
repairtechnique adopted has to restore the integrity of the
damagedcomposite structure. Although number of researchers
havestudied on various repair techniques for these
marinecomposites, layer-by-layer hand-laid and vacuum bagged
scarfrepaired technique provided a better repair efficiencies
amongst
them. However, there is always strive towards an better
efficient,high quality, cost-effective and environmental friendly
repairtechnique . Undoubtedly, for a successful repair
procedure,apart from the selection of a repair configuration, of
equalimportance is the processing method that is used to fabricate
therepair patch
The research
One of the modern fabrication technology for compositematerial,
vacuum-assisted resin infused technique is gaining
wider acceptance due to reduced styrene emission, one
stepprocess, more consistent, higher laminate properties etc.
Inthis current study, this vacuum assisted resin infusedfabrication
technique is adopted as the repair route to scarfrepair the damaged
composite. The composite scarf joint
configuration was utilized to simulate scarf repairedcomposite
panels. The tensile testing studies are carried out toobtain the
repair efficiency. Aiming towards higher efficiencydifferent repair
configurations studies are attempted.
Results:
Repair efficiency = %
Where is undamaged tensile strength and isrepaired tensile
strength
100x
V
R
Methods and testing:
Eglass -epoxy composite laminate with layup (0/45/-45)2sused.
Destructive tensile testing of the coupons was performedat room
temperature on an Instron 5569 testing machine,equipped with a 50
kN load cell, at 2 mm/min.
Tensile repair efficiency studies are carried out for
differentrepair configurations, namely,1) Scarf angle : 1/10 and
1/202) Surface preparation : as produced (peel ply), surface
abraded
3) Repair material: Same as parent and different to parent
Failure mode studied; non-contact full field data is also
collectedand are used to validate the numerical model of the
repairtopology
R
v
Tensile strengthMPa Repair efficiency%
Parent 486.66 3.38 -
Repair (1:12),peelply
246.28 11 50.60
Repair (1:20),peelply
399.59 9.9 81.77
Repair (1:20,surface abraded)
433.57 27.5 88.72
