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العنوان
Fracture lifetime prediction of marine riser systems /
الناشر
Akram Mustafa Suliman,
المؤلف
Suliman, Akram Mustafa.
الموضوع
Naval architecture .
تاريخ النشر
2010 .
عدد الصفحات
xi, 159 p. :
الفهرس
Only 14 pages are availabe for public view

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from 177

Abstract

This work proposes a method for the engineering criticality analysis (ECA) and fitness for service (FFS) of marine riser systems using finite element simulation.
The complex case of a dented marine riser tubular member sustaining a circumferential crack is investigated in this work.
The scenario of a dented riser sustaining a crack is a credible scenario due to the operating conditions of marine risers which could buckle to the extent of denting and cracking and due to impact with material for example service boats or DROPped anchors.
The importance of this work arises from the fact that no previous work or literature has been compiled to study the combined impact of dents and circumferential cracks on the structural capacity of tubular members in general or on marine riser joints in particular.
A finite element model was carefully constructed and validated. The model was analyzed to give insight into the effect of the various combinations of different materials, with different dent depth and crack depths on the proposed tool and on the structural performance of tubular member suffering from dents and circumferential cracks.
Similar approach to the state of the art guidelines on the assessment of acceptability of flaws in metallic structures using failure assessment diagrams (FADs) as stipulated by API code 579, BS 7910 and Eurofitnet SINTAP were used in the study.
The proposed tool’s major objective is to benefit from the availability of cost effective computer power to assess flawed dented and cracked risers’ tubular members without being conservative and without compromising the safety and integrity of the riser systems investigated.
, The most important finding of the study is that the proposed tool could be u,sed in lieu of the standard F ADSs up to a loading condition of 80% yield strength.