کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1719877 1520253 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Validity and limitation of analytical models for the bending stress of a helical wire in unbonded flexible pipes
ترجمه فارسی عنوان
اعتبار و محدودیت مدل های تحلیلی برای استرس خمیدگی سیم پیچ خورده در لوله های انعطاف پذیر بدون اتصال
کلمات کلیدی
لوله انعطاف پذیر، سیم زرهی هلیکوپتر، استرس خم شدن، المان محدود، دامنه معتبر
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی


• Seven analytical models for the bending stress of a helical wire were summarized.
• We developed a 3D finite element model to investigate the seven models.
• The validity and limitation of these models for different parameters were discussed.
• The analytical model based on spring theory is recommended.

Unbonded flexible pipe is one of the important pieces of equipment in floating production systems for transport of oil and gas between floaters and subsea wells located in deep water. To assure safety over a long-term service period, analysis of fatigue behavior under alternative bending is a key requirement. An analytical model for prediction of bending behavior is essential for understanding the mechanism of the local stress distribution in the helical wires of the tension armor layers under alternative curvatures and rapid estimation of the service life of flexible pipes for designers in engineering practice. In this paper, seven analytical models available in the literature are selected and summarized. Although the experimental results reported in the literature are limited, a three-dimensional finite element model is developed for investigation of the seven models, and the validity and limitations of these models for different structural parameters of helical wire are discussed, i.e., the width-thickness ratio of the wire section and helical angle. The analytical model based on spring theory resulted in a satisfactory estimation of bending stress for most cases and is recommended as a tool for the basic design of the helical armor wire structures in flexible pipes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Ocean Research - Volume 50, March 2015, Pages 58–68
نویسندگان
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