پديد آورنده :
علي نيا، مرتضي
عنوان :
تحليل گذاري پارامترهاي ترك ايستا در لوله ي حاوي سيال تحت فشار
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
نه،104ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمدرضا فروزان
استاد مشاور :
احمدرضا پيشه ور
توصيفگر ها :
خطوط لوله ي پرفشار , شكست ديناميكي , اندركنش سيال و سازه , فاكتور شدت تنش ديناميكي
تاريخ نمايه سازي :
29/2/92
استاد داور :
صالح اكبرزاده، مهدي سلماني تهراني
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Transient Analysis of Stationary Crack Parameters on a Pressurized Pipe Morteza Alinia m alinia@me iut ac ir 23th January 2013 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mohammad Reza Forouzan forouzan@cc iut ac irAbstractDynamic fracture is one of the most important challenges facing the pipeline industry This phenomena canlead loss of revenue and life Because of expensive experimental tests analytical and numerical simulationsare preferred Most instances dynamic fracture mechanics analyses of structural components can safelyassume that the external loads are independent of the crack propagation and arrest event However forpressure vessels and pipelines this will not always be the case Here the flow of the contained mediumthrough the crack opening can play a significant role in dictating the crack driving forces Rapid crackpropagation along the axial direction of a gas pipeline is an important typical case Accordingly the highdegree of interaction between the escaping gas and the pipe wall deformation should be considered to obtainexact and reliable results The main aim of this study is to simulate and analyze stationary cracks using Fluid Solid Interaction FSI method For this purpose a coupled fluid structure modeling methodology forpressurized pipelines has been developed The pipe material have been modeled using the finite elementmethod with a ductile fracture criterion The finite volume method has been employed to simulate the fluidflow inside the pipe and the resulting pressure profile behind the crack tip which is the main source of thecrack driving force was computed and applied as a load in the finite element model Choked flow theorywas used for calculating the flow through the pipe crack The study involves three major parts In the firstpart the deformation and stress field surround the elliptical notch due to escaping of the high pressure gas issimulated using 2 way FSI method In the second part a new approach is developed for analyzing of astationary crack parameters due to escaping of the gas by combining a 1 way FSI simulation and try and errormethod The parameters like dynamic stress intensity factor KI stress field in the front of the crack tip andplastic zone was computed using this new approach It is assumed that the initial crack is parallel to the pipeaxis Finally in the third part the results of previous parts are validated by comparison to two experimentaltests The first test which was found in literature studies aluminum 6061 T6 tube and the other one was beendone in the present study using a hyper elastic tube The very promising results have been obtained Keyword High pressure gas transmission pipelines Dynamic fracture Stationary crack Fluid structureInteraction FSI Dynamic stress intensity factor
استاد راهنما :
محمدرضا فروزان
استاد مشاور :
احمدرضا پيشه ور
استاد داور :
صالح اكبرزاده، مهدي سلماني تهراني
