Investigation of failure mechanism of the composite tubes made by filament winding process by acoustic emission method

To study the energy absorption features in composite structures, it is necessary to identify the functional mechanisms of absorption and to determine the impact of each on the amount of energy absorption.In this study, the behavior of composite tubes under quasi-static compressive load by monitoring acoustic emission signals has been investigated.For this purpose, to make a filament wound composite tube, optimal parameters were first determined using the researches.In determining the optimal parameters, due to the uncertainty in the effect of the angle of fibers, from the optimal range of the intermediate-range, namely the angle of 35 degrees, was selected and investigated using the acoustic emission method.To ensure the experimental results, the finite element simulation method of ABAQUS software was used, and the VUMAT subroutine based on the Hashin criterion was implemented.The functional behavior of the tubes in this ply angle showed that the dominant failure mode was a local shear failure and lateral damage, which first caused the plastic deformation and then caused cracks to grow in the fiber direction.Also, the results of acoustic emission showed that the highest percentage of failure mechanisms are matrix cracking, fiber breakage, and debonding respectively.Finally, the use of the developed subroutine to predict the behavior of the structure was useful and was able to predict the behavior of the composite tube even after the maximum crushing force.