تحلیل وابسته به زمان رفتار لوله‌های فولادی تقویت‌شده با GFRP تحت اثر بارگذاری مرحله‌ای و استراحت تنش

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه صنعتی اراک، اراک

2 هیات علمی گروه مکانیک دانشگاه صنعتی اراک

چکیده
در این پژوهش، رفتار زمانی و استراحت تنش لوله‌های فولادی بدون درز API-X42 تقویت‌شده با کامپوزیت الیاف شیشه مورد مطالعه قرار گرفت تا اثرات وابسته به زمان ‌بر پایداری و ظرفیت باربری سیستم بررسی شود. پوشش کامپوزیتی لایه‌ای E-glass با رزین اپوکسی بر روی ناحیه اتصال لوله‌ها اعمال شد. آزمایش کشش به‌صورت تک‌مرحله‌ای و چندمرحله‌ای با توقف ۱۰ دقیقه‌ای در هر مرحله انجام شد و داده‌های تنش-زمان به‌صورت نرمال شده ثبت گردید. نتایج نشان داد که نرخ پایین پیشروی موجب آزادسازی تدریجی تنش و پایداری طولانی‌تر سیستم می‌شود، در حالی که نرخ‌های بالاتر باعث آزادسازی سریع‌تر تنش‌ها و رسیدن به وضعیت پایدار در مراحل اولیه می‌گردد. همچنین، افزایش تعداد مراحل بارگذاری منجر به کاهش تجمعی تنش و نزدیک شدن رفتار سیستم به حالت شبه‌پایدار شد. در نرخ‌های ۵۰، ۱۰۰ و ۲۰۰ میلی‌متر بر دقیقه، مقدار نهایی استراحت تنش به ترتیب 9/8، 7/7 و 4/9 درصد ثبت شد. این یافته‌ها نشان‌دهنده نقش کلیدی ویسکوالاستیسیته رزین و توزیع تنش بین الیاف و فلز در پایداری مکانیکی سیستم است و اهمیت بررسی رفتار زمانی در طراحی و پیش‌بینی عملکرد بلندمدت لوله‌های فولادی تقویت‌شده را تأیید می‌کند. نتایج این پژوهش راهنمایی روشن برای مطالعات آینده ارائه می‌دهد تا تأثیر بارگذاری چندمرحله‌ای و مکانیزم‌های شکست نهایی در سیستم‌های ترکیبی فولاد-کامپوزیت به‌طور جامع بررسی شود.

کلیدواژه‌ها


عنوان مقاله English

Time Dependent Analysis of the Behavior of GFRP-Strengthened Steel Tubes under Stepwise Loading and Stress Relaxation

نویسندگان English

Ramin Beyranvand 1
Mehdi Ansari 2
1 Department of Mechanical Engineering, Arak University of Technology, Arak
2 Faculty of Mechanics, Arak University of Technology
چکیده English

In this study, the time-dependent behavior and stress relaxation of API-X42 seamless steel pipes reinforced with glass fiber composites were investigated to assess the effects of time on system stability and load-bearing capacity. A composite layer of E-glass fibers embedded in epoxy resin was applied to the pipe joint regions. Tensile tests were conducted in single-step and multi-step modes, with a 10minute hold at each stage, and the stress–time data were recorded in normalized form. The results indicated that lower loading rates promoted gradual stress relaxation and extended system stability, whereas higher rates led to faster stress release and attainment of a stable state in the early stages. Moreover, increasing the number of loading steps resulted in cumulative stress reduction and brought the system behavior closer to a quasi-stable state. At loading rates of 50, 100, and 200 mm/min, the final stress relaxation values were recorded as 8.9%, 7.7%, and 9.4%, respectively. These findings highlight the key role of resin viscoelasticity and stress distribution between fibers and steel in the mechanical stability of the system and underscore the importance of evaluating time-dependent behavior in the design and long-term performance prediction of reinforced steel pipes. The results of this study provide clear guidance for future research aimed at comprehensively investigating the effects of multi-step loading and ultimate failure mechanisms in steel–composite hybrid systems.

کلیدواژه‌ها English

Composite
GFRP
Stepwise Loading
Relaxation
[1] Shamsuddoha M, Islam MM, Aravinthan T, Manalo A, Lau K-t. Effectiveness of using fibre-reinforced polymer composites for underwater steel pipeline repairs. Composite Structures. 2013;100:40–54.
[2] Alabtah FG, Mahdi E, Eliyan FF. The use of fiber reinforced polymeric composites in pipelines: A review. Composite Structures. 2021;276:114595.
[3] Reddy MI, Madhavarao S, BhadriRaju CR, Kumar MA, Varma PR. The effect of carbon fiber powder reinforced composite coating on mechanical properties of TIG welded black steel pipes. Materials Today: Proceedings. 2022;62:3516–21.
[4] Kong D, Huang X, Xin M, Xian G. Effects of defect dimensions and putty properties on the burst performances of steel pipes wrapped with CFRP composites. International Journal of Pressure Vessels and Piping. 2020;186:104139.
[5] Shi J, Wang W, Wei W, Jia B. Calculation model for bearing capacity of steel-CFRP composite pipeline under internal pressure. Heliyon. 2024;10.
[6] Arifin HH, Zardasti L, Lim KS, Noor NM, Yahaya N, Mazlan AN, et al. Stress distribution analysis of composite repair with Carbon Nanotubes reinforced putty for damaged steel pipeline. International Journal of Pressure Vessels and Piping. 2021;194:104537.
[7] Gazor MS, Ansari M, Hedayati Sk, Ansari M. Bone fixation implants with in-situ controllable stiffness: Modifying the R-curve behavior by 3D printing. Journal of Composite Materials. 2022;56:2337–50.
[8] Kabiri A, Liaghat G, Alavi F, Ansari M, Hedayati SK. A comparative study of 3D printing and heat-compressing methods for manufacturing the thermoplastic composite bone fixation plate: Design, characterization, and in vitro biomechanical experimentation. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine. 2021;235:1439–52.
[9] Ansari M, Golzar M, Baghani M, Taghavimehr M, Shirsavar MA, Yahyavi M. An experimental investigation on shape memory polymer and metallic stents under bending and radial compression. Engineering Research Express. 2020;2:045012.
[10] Ansari M, Golzar M, Behravesh AH. Evaluation of corrugated composite beam deflection by shape memory alloy wire. Modares Mechanical Engineering. 2014;14.
[11] Kong D, Zhou P, Li C, Hong B, Xian G. Stress intensity factor of through-wall-cracked steel pipe wrapped with prestressed CFRP composites. Engineering Fracture Mechanics. 2023;283:109218.
[12] Abd-Elhady AA, Sallam HE-DM, Alarifi IM, Malik RA, El-Bagory TM. Investigation of fatigue crack propagation in steel pipeline repaired by glass fiber reinforced polymer. Composite Structures. 2020;242:112189.
[13] Li Z, Jiang X, Hopman H, Zhu L, Liu Z. External surface cracked offshore steel pipes reinforced with composite repair system subjected to cyclic bending: An experimental investigation. Theoretical and Applied Fracture Mechanics. 2020;109:102703.
[14] Chen J, Wang H, Salemi M, Balaguru PN. Finite element analysis of composite repair for damaged steel pipeline. Coatings. 2021;11:301.
[15] Junior MW, Reis J, da Costa Mattos H. Polymer-based composite repair system for severely corroded circumferential welds in steel pipes. Engineering Failure Analysis. 2017;81:135–44.
[16] Ahankari S, Patil A. Sea water effect on mechanical performance of steel pipes rehabilitated with glass fiber reinforced epoxy composites. Materials Today: Proceedings. 2020;22:2490–8.
[17] George JM, Kimiaei M, Elchalakani M, Fawzia S. Experimental and numerical investigation of underwater composite repair with fibre reinforced polymers in corroded tubular offshore structural members under concentric and eccentric axial loads. Engineering Structures. 2021;227:111402.
[18] Verde R, D’Amore A, Grassia L. A Numerical Model to Predict the Relaxation Phenomena in Thermoset Polymers and Their Effects on Residual Stress during Curing—Part I: A Theoretical Formulation and Numerical Evaluation of Relaxation Phenomena. Polymers. 2024;16:1433.
[19] Lim KS, Azraai SNA, Yahaya N, Noor NM, Zardasti L, Kim J-HJ. Behaviour of steel pipelines with composite repairs analysed using experimental and numerical approaches. Thin-Walled Structures. 2019;139:321–33.
[20] Hassan A, Sokairge H, Elshafie H. Relaxation behavior of basalt fiber reinforced polymer bars under different environmental conditions. Mechanics of Time-Dependent Materials. 2025;29:32.
[21] Mehmanparast A. Evaluation of Frequency Effects on Corrosion-Fatigue Behaviour of Offshore Steel Pipelines.  International Conference on Offshore Mechanics and Arctic Engineering: American Society of Mechanical Engineers; 2024. p. V003T03A7.
[22] Stochioiu C, Hadăr A, Piezel B. Mechanical response of epoxy resin—flax fiber composites subjected to repeated loading and creep recovery tests. Polymers. 2023;15:766.
دوره 5، شماره 1
بهار 1404
صفحه 146-170

  • تاریخ دریافت 18 اردیبهشت 1404
  • تاریخ بازنگری 28 خرداد 1404
  • تاریخ پذیرش 31 خرداد 1404