Failure of woven fiber glass epoxy composite under charpy impact loading
2012
Woven glass fiber reinforced epoxy composite at 55 vol% fiber content was
fabricated using conventional hand lay-up method. The impact strength of the
prepared samples were measured under Charpy impact test at +50oC and -
50oC temperature. The fractured surface of composite samples were
investigated using scanning electron microscope. The impact energy for
samples fractured at +50oC was at 380 KJm-2 whereas the low temperature of -
50oC showed impact energy of 178 KJm-2. The high plastic deformation from
the sample tested at +50oC is the evidence from the high amount of absorbed
energy compared to -50oC which revealed lower deformation. At this subzero
temperature, the increased brittleness produced extensive matrix cracking and
fiber splitting. However, scanning electron fractograph at +50oC showed mixed
failure mode of large delaminations, fiber splitting and matrix cracking. The
impact values of 380 KJm-2 and 178 KJm-2 tested at +50oC and -50oC
respectively would suggest that this composite is suitable to replace steel for
impact applications and is safe to be used at both high and low environmental
temperatures.
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