Nowadays oil,natural gas and other energy sources are mainly transported by pipeline,the pipeline will produce various defects in long-term use,and these defects will have an affect on the structure and strength of the pipeline.The current advanced pipeline repair technology is composite reinforcement technology,of which carbon fiber reinforced plastic(CFRP)are the better choice.In order to test the effect of reinforcing the pipe defects with/without carbon fiber,the tensile experimental study of CFRP with different number of layers was carried out.Combined with ANSYS numerical simulation,the stress and strain distribution of different defective pipelines in bearing before and after repair were investigated,and the influencing factors of the repair and reinforcement effect were analyzed.The results show that:the thickness of defect thinning has a greater affect on the stress and strain state of the pipe,CFRP technology can optimize the stress and strain distribution of the pipe defects while reducing the stress and strain,and the repair effect can be improved by increasing the number of carbon fiber repair layers,and the relevant research has a certain guiding significance for the repair of the pipeline reinforcement.
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