reinforced composite materials are one of the most substantial materials used
for many applications which include building materials, aerospace industries,
automotive industries, prosthetic. The reasons being their high strength to
weight ratio, compliance, ease of combination with other materials like metals,
accessibility of raw materials, cost efficacy. Out of many fibers available in
present market, glass fibers are one of the economical materials. GFRP comprises
of tremendously thin long cylindrical milled glass fibers of diameter ranging
from 10 to 15 microns embedded in polymer matrices leading to low weight
assemblies. GFRP can be fabricated using hand lay-up method, rein transfer
molding, pultrusion etc. Among these, Pultrusion is an automated procedure in
which uniformly cross sectioned, long unidirectional composite materials are obtained.
Glass Fiber Reinforced Polymers (GFRP) are by far the mostly used commercial
composite materials. We can witness their use in many daily used objects to
automotive, aircraft parts such as sanitary ware, water tanks, electrical
insulation pipes, car body panels, dash boards, engine cowlings, luggage racks
and not to forget TV parts, radios, computers etc.

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However, real-life
situations demand more stability and durability from different structures,
which cannot be justified by using composite materials alone. Hence, one way to
achieve such desirable properties is by effective combination of metals and composite
materials. The joining of these two dissimilar materials can be done in
different conventional ways like mechanical fastening, adhesive bonding etc. Considering
the effects of stress concentration, reduction in cross sectional area, incomplete
sealing of surfaces, increase in total structure weight etc. adhesive bonding
is preferred to mechanical fastening as a primary joining process for complex
structures. Another effective way of joining is by combining both adhesion and mechanical
fastening which gives more strength and larger life as adhesive may degrade
over time.