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Adhesive
joint strength
is
fundamental
to the
attachment
strength
of an
adhesive
bonded
fastener.
The adhesive
bond strength
is a function
of a number
of variables:
the strength
of the fastener,
the surface
area of
the fastener,
the fastener
material
and finish,
the adhesive
selected,
the thoroughness
of the adhesive
mixing,
the time
elapsed
between
adhesive
mixing and
application
to the bond
surfaces,
the temperature
during adhesive
cure, the
application
of constant
pressure
(fixturing)
during adhesive
cure, the
surface
preparation
of the substrate,
the substrate
material
and finish,
and the
thickness
of the substrate.
The key
to consistent
adhesive
bonding
is controlling
the process.
(Click Bond
Process
Specification
CBPS206
outlines
the recommended
materials
and process
for adhesive
bonded fasteners.)
Other
design factors
include
the environment
(temperature,
humidity,
etc.) the
joint will
be exposed
to, the
type of
loading
(tension,
shear, torque,
vibration,
etc.), the
maximum
load, the
desired
safety factor,
the weight
of the fastener,
and the
labor cost
for installation.
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