TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Influence of Wall Thickness on the Behavior of Coiled Tubing to Cyclic Bending with Internal Pressure
(Universitatea Petrol ? Gaze din Ploieşti, Bd. Bucureşti nr. 39, Ploieşti e-mail: vulmanu@upg-ploiesti.ro)
Vol LX • No. 1/2008
Vlad Ulmanu, Dragoş Zisopol, Ciprian Trifan
Universitatea Petrol ? Gaze din Ploieşti, Bd. Bucureşti nr. 39, Ploieşti
e-mail: vulmanu@upg-ploiesti.ro

 Keywords   coiled tubing, bending, internal pressure, fatigue, cracking

 Abstract
Under variable loads, the coiled tubing undergoes irreversible damage, which consists in crack initiation and propagation, eventually leading to fatigue failure. This paper presents the results of the experimental research concerning the influence of the wall thickness on the fatigue behavior of coiled tubing manufactured from A and X 70 materials subjected to cyclic bending with internal pressure.

 Rezumat
Sub acţiunea solicitărilor variabile, materialul tubular (tubingul flexibil) suferă degradări ireversibile, constând în iniţierea şi propagarea fisurilor, al căror stadiu final este ruperea la oboseală. În cadrul acestei lucrări sunt prezentate rezultatele cercetărilor experimentale privind influenţa grosimii de perete asupra comportării tubingului flexibil confecţionat din materialele A şi X 70, la încovoiere cu presiune interioară.





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