A Hashin Criteria Investigation to Predict the Interaction Effect of Defaults on the Damage of Composite Pipe

Pressurized during their service the composite pipelines are damaged either by the presence of defects or by their aging. The damage of composite carboxyl pipeline under the bending moment M = 1rd and several internal pressures within 40, 60, 80 bar range by the presence of two defects is studied. Using the HASHIN criterion, a numerical prediction through the calculation code ABAQUS takes the objective of evaluating the damage by interaction effect between two defects. The results are presented by evaluated curves of correlation between the moment to the damage and the parameters of orientation and location of the defects. The interaction effect of defects on damage is conditioned by their locations along the pipeline surface. The obtained results show a strong influence of the defects on the level and the modes of failure as well as their response till the damage.