Abstract
In this study, the three-dimensional finite element method is used to analyze an API 5L X70 steel cylindrical pipeline subjected to an internal pressure load by calculating the stress intensity factors and the integral J at the peak of crack in elastic and elastoplastic behavior. The effectiveness of composite patch repair bonded to the cracked surface is highlighted. The effects of the geometrical and mechanical properties of the composite patch and the adhesive on the effectiveness of the repair were highlighted. The variation of the stress intensity factor at the crack tip is used to evaluate the repair performance. The results obtained show that the residual heat stress significantly increases the stress intensity factor at the bottom of the crack, which reduces the effectiveness of the repair.
Highlights
G lobal energy demands continue to rise with the rapid development of the global economy. [1] Pipeline transportation of oil and gas is the safest and cheapest way for hydrocarbon transportation companies. [2] To increase the profitability of a pipeline, the flow is often increased by increasing the service pressure. [3] Considerable research work is available in the literature on the various aspects of bonded composite joints
In a typical repair applied to pipeline structures, the reinforced region is initially heated to a temperature of about 100-120 ° C under pressure for about 1 hour and cooled to room temperature after curing of the adhesive
The novelties of this work are the parametric studies of the effects of the geometric, thermal and mechanical properties of the composite on the variation of the stress intensity factor at the end of cracks repaired with aadhesived composite patch
Summary
G lobal energy demands continue to rise with the rapid development of the global economy. [1] Pipeline transportation of oil and gas is the safest and cheapest way for hydrocarbon transportation companies. [2] To increase the profitability of a pipeline, the flow is often increased by increasing the service pressure. [3] Considerable research work is available in the literature on the various aspects of bonded composite joints. [5] One example is the development of residual stresses when a high cure temperature adhesive is used to bond a repair patch to a substrate with a different coefficient of thermal expansion. Mhamdia et al [14] analyzed the effects of residual thermal stress on the variation of the stress intensity factor in an aluminum plate repaired with a composite boron / epoxy patch. The purpose of this study is to analyze the effect of the variation of the stress stress factor of repaired crack in steel pipelines with aadhesived composite patch. The novelties of this work are the parametric studies of the effects of the geometric, thermal and mechanical properties of the composite on the variation of the stress intensity factor at the end of cracks repaired with aadhesived composite patch
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