Behavioral Study and Evaluation of Rubber Core Sandwich Beam Under Impact Loading
DOI:
https://doi.org/10.38124/ijsrmt.v1i2.8Keywords:
Sandwich Beam, Sandwich Material, Light Weight Structure, ANSYAbstract
The shock resistance of structures is of current
interest of academia and industry. Sandwich structures
have been proposed as alternatives to conventional
monolithic structures in order to enhance the shock
resistance. Sandwich structures are widely used in many
important fields, such as ship, aircraft, automotive and
aerospace industries, packaging and construction
engineering.
In this study, a number of experiments were
conducted to investigate the structural response of
dynamically loaded on clamped (both end) 1mm thick
monolithic aluminium beams and rubber core sandwich
beams of 3.02 mm and 4.02 mm thicknesses impacted by
a blunt nosed cylindrical projectile made of mild steel of
diameter 12.8 mm, length 30.2 mm and mass 0.03018 Kg
in sub ordinance velocity range (20 to 110 m/s). Sandwich
structure consists of two face sheets of aluminium
adhered to a low-density rubber core. The failure of
composite specimens observed in the tests can be
classified with respect to the front face sheet, core and
back face sheet, respectively Different parameters like
impact velocity,residual velocity, velocity drop, energy
absorbed, kinetic energy, deflection, dimensionless
external dynamic energy, and dimensionless maximum
transverse permanent deformation were observed
experimentally and calculated analytically with the help
of work in the past.
Three modes of failure of beams have been found
during the experiment on monolithic and rubber core
sandwich beams like mode-1: Fracture at the point of
strike i.e. tearing; mode-2: Fracture at one or both
support either on front face sheet or on back face sheet of
beam i.e. end shear; mode-3: Fracture at the point of
strike with bulging (cup shape) and after fracture beam
turnaround from the support (in case of monolithic) or
Fracture at the point of strike without bulging on front
face sheet and after fracture on the back face sheet with
bulging and beam turnaround from the support (in case
of sandwich beam).
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