ارزیابی و مقایسه فشار ترکیدن لوله‌های خورده شده برمبنای مدل اجزای محدود برای فولادهای با مقاومت متوسط و بالا

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده مهندسی، دانشگاه زابل

چکیده

لوله‏ های فولادی به‌عنوان یکی از پرکاربردترین سازه‌ها جهت انتقال نفت و گاز به­ شمار می‌روند. عمدتاً کاهش مقاومت به‌واسطه خوردگی، بسته به محل عبور آن‌ها و نیز شرایط محیطی موجب کاهش عملکرد صحیح آن‌ها در طول دوره بهره‌برداری می‌گردد. در این مقاله، فشار ترکیدن لوله‌های خورده شده با استفاده از روش اجزای محدود غیرخطی بر مبنای مدل مصالح Ramberg-Osgood در سه سطح کرنش تسلیم 1، 5/0 و 2/0 درصد ارزیابی شده است. صحت مدل­سازی اجزای محدود برای 40 داده‌ واقعی آزمایشگاهی از انواع لوله با فولادهای با گرید متوسط و بالا مانند X60، X65،X80 و X100 با روابط تجربی و آیین‌نامه‌ای قیاس گردیده است. فشار ترکیدن مطابق با تحلیل اجزای محدود از تلاقی حداکثر تنش حاصله از سه نقطه داخل، خارج و میانه در محل خورگی لوله تخمین زده شده است. خوردگی به‌صورت بیضوی شکل در مدل اجزای محدود در نظر گرفته شده است. آماره‌های قیاسی همانند مجذور میانگین مربعات خطا، میانگین قدر مطلق خطا، شاخص همبستگی و ضریب کارایی استفاده شده است. نتایج نشان می‌دهد که مدل‌های اجزای محدود نسبت به مدل‌های تجربی از دقت بالایی برخوردار بوده و بهترین حالت مدل‌سازی غیرخطی فشار ترکیدن لوله‌های خورده شده با استفاده از مدل Ramberg-Osgood با کرنش تسلیم 2/0 درصد حاصل شده است. در این مدل مجذور میانگین مربعات خطا با مقدار 329/1، میانگین قدر مطلق خطا با مقدار 113/1 شاخص همبستگی با مقدار 912/0، ضریب کارایی با مقدار 813/0 بهترین نتایج را نسبت به سایر مدل‌ها داشتند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation and Compression of Burst Pressure for High/Mid-Grade Corroded Pipelines Using Finite Element Model

نویسندگان [English]

  • Mohhamad Ali Sharaki Nader
  • Behrooz Keshtegar
  • Mahmoud Reza Hossieni Tabatabaie
Department of Civil Engineering, University of Zabol, Iran
چکیده [English]

The applications of steel pipelines for oil and gas transportation have grown over the past three decades. Due to the biological, service life performance, economical issue and human safety, it is important to keep a safe performance for oil/gas pipeline and to evaluate their serviceability under uncertainties including environmental issues (i.e. corroded defects) and applied loads (i.e. internal pressure). The accurate estimation of structural performance as load capacity-based burst pressure of steel pipes under corroded defects can be provided a robust design in service life. Therefore, predicting the residual strength of pipelines with corrosion defects is an important problem in these kinds of industrial structures. A one of oriented design relation of corroded burst pressure models is the ASME B31G which was presented by the American national standard Institution (ANSI). In the term of PCORRC criterion, Stephens and leis (2000) presented a mathematical model based on exponential nonlinear function using experimental results for low and moderate-strength steels. Generally, the shape of corrosion was considered as a rectangular form using DNV RP F101 (2004) for low and moderate-strength steels. Zhu and Leis (2005) applied the material hardening behavior in the mathematical model for prediction of corroded burst pressure. The presented model is extracted from X80 steel grade while it may be not covered the vast categories of steel pipes. (Ma et al., 2013) applied the Ramberg-Osgood relationship for material in finite element models (FEM) of steel pipes under single corrosion. However, they did not discuss the different yield strains of materials. The FEM have been used for computing the strength capacity of corroded pies by (Mechri et al., 2016), (Hieu et al., 2017) and (Shuai et al., 2017), but the Ramberg-Osgood nonlinear martial model has not considered with different yield strains.

کلیدواژه‌ها [English]

  • Corroded pipes
  • Finite element model
  • Burst pressure
  • Ramberg-Osgood model
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