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Article
Evaluation the Effect of Residual Stress on Fracture of Polyethylene Pipe under Pressure Loading

Author: Haider Hadi Jasim
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2016 Volume: 16 Issue: 2 Pages: 71-78
Publisher: Basrah University جامعة البصرة

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Abstract

In this paper, the Weibull uni-axial and multi-axialthe distribution function for polyethylene pipes under pressure loadingwere developed and analyzed taking account of residual stress.The tensile test was achieved to determine mechanical properties andthe Weibull parameters. An experimental method using the hole drilling strain-gage method was used to measure the residualstresses in PE pipe and compare with that obtained fromnumerical finite element method (FEM). The obtained resultsshow that there is a convergence between uni-axial and multi-axialdistribution function, but multi-axial distribution function givelarge values compared to the uni-axial distribution function. It wasobserved that the residual stresses have influence on failureassessment diagram and cause translation from elastic-plasticfailure to brittle failure.


Article
ESTIMATION OF DOKAN RESERVOIR RELIABILITY USING STREAM FLOWDATA GENERATION TECHNIQUES

Author: Ruqaya K.M. Al-Masudi
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2013 Volume: 6 Issue: 3 Pages: 294-307
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

In the present study, two procedures of capacity-yield are applied to estimate the reliability ofDokan reservoir using data generation techniques. These procedures are the probability matrix(Gould) procedure, and the behavior analysis. Vulnerability, and resilience, are also calculated in thesecond procedure .The data is generated by using four approaches ,namely ,Thomas-Fiering modelwith log –transformation (TF-log), Two-Tier model (TTM), modified Two-Tier model (MTTM) andmodified Fragment model (MFM).These models are tested and compared with the historical data. It isconcluded that among these four procedures the Thomas-Fiering model with log –transformation isthe most appropriate for representing the Dokan reservoir inflow .Three factors are examined todetermine their influence on the minimum storage estimate .These are the length of stochasticallygenerated sequence, the initial state of storage ,and the starting month. The results reported here showthat sequences as long as 10,000 years or more may be needed to minimize the effects of thesefactors.

في هذه الدراسة طبقت طريقتان ناط طارل ال ا ة-الإطاقل لتخمانط اتتمنيياة اا ا ين ان بنساتخدا البنناانا المدلاد . هاذهالطرل هي طريقة جدلد ن طريقة تحلنل ال لدك.المرناة نالض ف ح بتن اتتمنيا تلى الطريقاة اخانار .تم تدلناد البنناانا بنساتخداأرب ة طرل هذه الطرل هي طريقة ثدننس-فنيراك نع اساتخدا التحاديقا اللدرنريتمناة ، طريقاة تاد-تنير،طريقاة تاد-تانير الم دلاة،نطريقة فرا منات الم دلة . استخدنت البننانا المدلد لمقنراة النتنئج نع النتنئج المح دبة بنساتخدا البنناانا التنريخناة نفاي ا االدقت لمقنراة اتنئج الطرل اخرب ة لتدلند البننانا فنمن بننهن ناستنتج إ طريقة ثدننس-فنيراك نع استخدا التحديقا اللدرنريتمنةهي اخفضل لتمثنل التصنريف الداالة لخ ا ين ن .ثقثة تدانل تم فحصهن لإيجني تأثنرهن تلى تخمنط الخ المطلدب.هذه ال دانل هي طدل سل الة التصانريف المدلاد ، حنلاةالخ يط اخنلي للخ ا ، نالبدا بشهر نن. أظهرا النتنئج المقدنة في هذه الدراسة بأاه يحتنج إلى سل لة جرين بحادني 10,000 سانةأن أ ثر لتقلنل تأثنر هذه ال دانل.

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