علوم و فناوری کامپوزیت

بازرسی لوله های چند لایه به کمک امواج هدایت شده پیچشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، مهندسی مکانیک، دانشگاه شهید چمران اهواز، اهواز

2 استادیار، مهندسی مکانیک، دانشگاه شهید چمران اهواز، اهواز.

چکیده

کاربرد لوله‎ های چندلایه به دلیل مزیت‌های مکانیکی و شیمیایی آن‌ها به‌عنوان جایگزین لوله‎ های همگن جهت انتقال نفت، گاز و مواد پتروشیمی در حال افزایش است. جهت جلوگیری از مسدود شدن خطوط انتقال و زیان وارده از آن می‎ بایست که بازرسی ها و آزمونهای غیر مخرب مانند آزمونهای فراصوت برای اطمینان از صحت کارکرد آن‎ها به‌ صورت مداوم انجام گیرند. ازاین‌رو در این تحقیق، ابتدا معادلات انتشار موج پیچشی در لوله چندلایه مورد بررسی قرار گرفته و روابط میدان‎ های جابجایی و تنش های دینامیکی در لوله چندلایه استخراج شده است، سپس نمودارهای دیسپرژن و سرعت گروه برای لوله‎ چندلایه با توجه به شرایط مرزی مسئله رسم شده است. همچنین، انتشار موج پیچشی در لوله چندلایه با استفاده از روش اجزاء محدود در نرم‌افزار ABAQUS شبیه سازی شده است. با مقایسه نتایج تحلیلی و شبیه سازی عددی مشاهده می ‎شود که نتایج کامل با یکدیگر تطابق داشته و مدل‎سازی به‌درستی انجام گرفته است. در انتها نیز تأثیر عوامل مؤثر بر انتشار موج پیچشی در لوله های دولایه و سه لایه بررسی شده است. نتایج به دست آمده نشان می‎ دهند که ضخامت لایه ها، ترتیب لایه ها و جنس تشکیل دهنده لایه های لوله بر سرعت انتشار موج پیچشی در لوله های چندلایه تأثیرگذار است.

کلیدواژه‌ها

عنوان مقاله [English]

Inspection of Multilayer Pipes Using Torsional Guided Waves

نویسندگان [English]

  • Mohammad Pourmansouri 1
  • Reza Mosalmani 2
  • Amin Yaghootian 2
  • Afshin Ghanbarzadeh 2

1 Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

چکیده [English]

The use of multilayer pipes has increased recently thanks to their superior mechanical and chemical properties as a replacement of homogeneous single-layer pipes. Therefore, applicable inspections and non-destructive tests for multilayer pipes should be investigated. In this study, the governing equations of torsional wave propagation in the multilayer pipe were initially developed, and the relations between the displacement fields and dynamic stresses in the multilayer pipe were calculated. Then, the dispersion curves and group velocity for the multilayer pipe are plotted according to the boundary conditions. The torsional wave propagation in the multilayer pipe was also simulated using the finite element method via ABAQUS software. By comparing the analytical results and the numerical simulations, a complete agreement was observed between the results. Finally, the influence of effective parameters on torsional wave propagation in two- and three-layer pipes was investigated. The obtained results showed how the thickness, lay-up, and mechanical properties of the layers could affect the velocity of torsional wave propagation in the multilayer pipes.

کلیدواژه‌ها [English]

  • Torsional guided waves
  • Wave propagation
  • Multilayer pipes
  • Finite element method
  • Dispersion curve
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