The impact response of unidirectional continuous sisal fiberreinforced
cement composites was investigated. An impact test
setup based on a free-fall drop of an instrumented hammer on a
three-point bending configuration test was used. The effect of
impact energy on the composite response was investigated by using
three different drop heights. Mechanical properties obtained under
impact loading were compared with static three-point bending
tests. A comparison with the impact behavior of glass fabricreinforced
composites was addressed. Furthermore, damage
mechanisms were investigated by characterizing the cracking
patterns during the impact event using a high-speed digital camera.
It was observed that while the maximum flexural stress values were
in the same range for static and impact tests, the absorbed energy
increased up to a maximum level of 0.0090 kJ/in.2 (14.0 kJ/m2) for
the impact energy of 20 J. The damage process was initiated by
tensile and shear cracks. Delamination of the plies within the
continuous fiber composites was observed only when the impact
energy was 27 J.
Keywords: cement composites; impact test; sisal fiber.
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