کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5473250 1520237 2017 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A nonlinear viscoelastic bend stiffener steady-state formulation
ترجمه فارسی عنوان
فرمولبندی حالت پایدار غیرخطی استوانه ای استوانه ای خمشده
کلمات کلیدی
سفت کردن سفت کننده ناهمگونی غیرخطی، حالت پایدار، دامنه فرکانس، دامنه زمان، بالابر انعطاف پذیر، اتصال بالا،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی
Bend stiffeners are essential components of a flexible riser system, employed to ensure a smooth transition at the upper connection and to protect the riser against over bending and from accumulation of fatigue damage. The highly nonlinear rate dependent behavior of these structures directly affects the integrity assessment of the riser in one of its most critical regions, the top connection. A steady-state formulation (disregarding inertial forces) and numerical solution procedure is developed in this work employing the perturbation method for a nonlinear viscoelastic bend stiffener large deflection beam model subjected to harmonic loading conditions. For stochastic loading conditions, the response is calculated employing the superposition principle by summing up the steady-state result of a number of individual frequency components. A time domain formulation is also derived employing the state-variable approach for the numerical solution of the resulting hereditary integral in the governing equations. A case study is presented for the top connection system of a 4″ ID flexible riser using relaxation and tensile experimental data obtained from a typical class of bend stiffener polyurethane. Harmonic and stochastic input loading conditions are employed for time and frequency domain model comparison/validation and to assess loading history and frequency influence in the curvature response.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Ocean Research - Volume 66, June 2017, Pages 32-45
نویسندگان
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