PSI - Issue 5

Amr A. Abd-Elhady et al. / Procedia Structural Integrity 5 (2017) 123–130 Amr A. Abd-Elhady et al. / Structural Integrity Procedia 00 (2017) 000 – 000

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4. Conclusions The results of the present numerical work support the following conclusions: 1- Whatever the inclination angle of the stationary crack in pipe under internal pressure, the crack will convert its direction to grow under pure mode I, i.e., parallel to pipe axis. 2- The pipe with composite repair has a higher crack initiation pressure than that of pipe without composite repair. 3- The crack path is not affected by the presence of composite repair patch. 4- The composite repair reduces the value of J -integral of stationary crack in steel pipe and subsequently increases the life of the pipe. 5- The crack closure produced by adhesively bonded composite repair patch is more pronounced for larger crack length and high mode of mixity, for the same patch dimensions and location. Acknowledgements This work was funded by the Deanship of Scientific Research (DSR) at Jazan University, KSA. Project: DSR # JUP7/069/2017. ABAQUS, 2002. user’s manual version 6.3. Pawtucket, RI: Hibbitt, Karlsson and Sorensen Inc. Abd-Elhady A.A., Sallam H.E.M., 2015. Crack Sensitivity of Bolted Metallic and Polymeric Joints. Engineering Fracture Mechanics 147. 55 – 71. Alexander C, Ochoa O., 2010. Extending Onshore Pipeline Repair to Offshore Steel Risers with Carbon – Fiber Reinforced Composites. J Compos Struct 92, 499 – 507. API 5L. 2000. Specification for line pipe. APL specification 5L, 42nd ed. USA: The American Petroleum Institute. Arikan H., 2010. Failure analysis of (±55 o )3 filament wound composite pipes with an inclined surface crack under static internal pressure. Composite Structures 92, 182 – 187 ASME PCC2., 2006. Repair of pressure equipment and piping standard. 2006 ed. New York (NY): ASME. Baker A., 1999. Bonded composite repair of fatigue-cracked primary air craft structure. Compos Struct., 47, 431 – 43. El-Bagory, T.M., Sallam, H.E.M., Younan, M., 2015. Evaluation of Fracture Toughness Behavior of Polyethylene Pipe Materials”, JPVT, 137(6), 061402, 10 pp. El-Bagory, T.M., Sallam, H.E.M., Younan, M., 2014. Effect of strain rate, thickness, welding on the J – R curve for polyethylene pipe materials. Theor Appl Fract Mech 74. 164-180. El-Bagory, T.M., Younan, M., Sallam, H.E.M., Abdel-Latif, L. 2013. Plastic load of precracked polyethylene miter pipe bends subjected to in plane bending moment. JPVT 35, 061203, 9 pp. Elguedj T., Gravouil A., Combescure A., 2006. Appropriate Extended Functions for X-FEM Simulation of Plastic Fracture Mechanics. Computer Methods in Applied Mechanics and Engineering, 195, 501 – 515. Gosz, M., Moran B., 2002. An interaction energy integral method for the computation of mixed-mode stress intensity factors along non-planar crack fronts in three dimensions. Eng. Fract. Mech., 69,299-319. Köpple M.F, Lauterbach S., Wagner W., 2013. Composite repair of through-wall defects in pipe work – Analytical and numerical models with respect to ISO/TS 24817. Composite Structures, 95, 173 – 178. Shouman A, Taheri F., 2009. An investigation into the behaviour of composite repaired pipelines under combined internal pressure and bending. In: Proceedings of the ASME 28th international conference on ocean, offshore and arctic engineering, Honolulu, Hawaii. Shouman A, Taheri F., 2011. Compressive strain limits of composite repaired pipelines under combined loading states. Composite Structures, 93, 1538 – 1548. References