Özet:

Torsional behavior of thin section glass/epoxy composite pipes was analyzed to study the failure and fracture characteristics based on Hashin’s damage criterion. The variation of shearing stress histories was investigated according to different twisting angles ( θ=20, 40, 60,80,  and 100). For this purpose, composite pipes were modelled by using ABAQUS/explicit subroutine, their stress and force values whether resulting in failure or not as well as failure types in the modelled composites pipes were analyzed within the constant time of the numerical analysis. Results showed that increasing of twist angles by 80 and 100 caused the high amount of shearing failures in the composite pipes while other twist angles did not effected on damage mechanisms over the samples. In addition, increment of the twisting angle after the certain value (θ=60) resulted a slightly increase in force, and followed a force fluctuations after the peak load, implying brittle nature of composite sample.

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