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1 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April STRUCTURAL ANALYSIS OF NON-LINEAR PIPE BENDS 1 KALIKI HEMANTH, M.IMTHIYAS SHERIFF, KODAM VINEETH KUMAR, 2 M.ANANDRAJ, 3 S.SELLAKUMAR 1 Under graduaion, Saveeha engineering college,chennai, Tamil nadu, , india 2 Pos graduaion, Saveeha engineering college,chennai, Tamil nadu, , india 3 Assisan Professor,Saveeha engineering college, chennai, Tamil nadu, , india Corresponding Auhor kalikihemanhreddy@gmail.com Absrac: Pipe bends are mos imporan necessary for all kind of indusries in erms of pipelining maerials. Pipe bend is very difficul o avoid hickening on he inner side of he pipe bend and hinning of he ouer side of he pipe bend. The cross secion also becomes non circular due o bending process; his end o cause ovaliy and hinning in pipe bends. ovaliy is he main cause o fail he pipe. This sudy is an aemp o analyze he sainless seel ube.we are going o apply boh inernal load and exernal load on he pipe. Inernal load we are applying as pressure and exernal load we are going o applying by using spring balance The sainless seel ube wih Diameer 42.2mm and hickness 3mm and bend radius of 250 mm for percenage of ovaliy varied from 0 o 20 is considered for doing analysis. The pipe bend geomery is impored in o ANSYS as IGES file and he convergence sudy was performed. Work bench opion is invoked in he analysis for beer resuls.. The resuls of analysis presened in he form of oal deflecion and sresses for incremened inernal pressure was compued for various percenage of ovaliy. During his process he bend undergoes plasic insabiliy due o pressure and bending. Pipe bends improve he pipe qualiy and rusworhiness in erms of pipe bend analysis. Finally, he induced sress inensiy and deformaion of pipe due o inernal pressure and bending were noed. Nomenclaure: Co - Percenage of ovaliy, C - Thinning Ch - Thickening P - Inernal design pressure D - Diameer of pipe mean pipe radius (mm) P - Inernal pressure Dmax - Maximum ouside pipe diameer (mm) Dmin - Minimum ouside pipe diameer (mm) min - Mininum hickness max - Maximum hickness - Normal wall hickness Do - Nominal diameer of pipe(mm) 1.Inroducion: Generally for elbows here is high conservaism in he sense ha he experimenal loads are greaer han hose prediced. Pipe bend is very difficul o avoid he hinning on he inner side of he bend and hinking of he ouer side of he bend.therefore, wih an increase in emperaure he pipe is sreched by he expanding liquid and he liquid is compressed by he confinemen of he pipe. The pipelines used o ranspor heaed fluids experience changes in heir free lengh wih a change in emperaure of he fluids. Pipe bends are used exensively in power plans o convey fluids and o change he direcion of he fluids flowing inside he pipes. During operaion, pipe bends wih hinning are

2 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April subjeced o higher sresses han pipe bends wih perfecly circular cross-secions. The srucural inegriy and cos of pipelines are of major concern in oil, chemical, and oher indusries. Pipelines can be subjeced o severe hermal, pressure, and oher mechanical loads.the pipelines used o ranspor heaed fluids experience changes in heir free lengh wih a change in emperaure of he fluids.in he general case, mos liquids expand hermally more per uni volume han does he pipe volume. Therefore, wih an increase in emperaure he pipe is sreched by he expanding liquid and he liquid is compressed by he confinemen of he pipe. The bend secion is he weaker par in high pressure applicaion because he pipe bend will be made wih he ovaliy. In his projec we are going o apply boh exernal and inernal load on pipes. We are going o apply inernal load as pressure which will conrolled by pressure regulaor and exernal load as weighs by using weighing machine 1.1 Purpose of pipe bend A smooh pipe bends are imporan componen in a piping work sysem. Normally, pipe sysems are designed wih sufficien direcional changes o sui he available working space and also o provide inheren flexibiliy o compensae for expansion and conracion. The pipe bends and he U-shape pipeline sysem (which is fabricaed wih 90 degree elbows and sraigh pipe) may be used in any piping sysem.i is very difficul o avoid 1.2 DEFINITION Ovaliy or Non circulariy I is he raio of he difference beween he major diameer and minimum diameer by he nominal diameer of he pipe Ovaliy of pipe c D o= MAX D MIN (1) D O Ovaliy in percenage WHERE; c D o= MAX D MIN 100 (2) D O Thinning D D o= MAX +D MIN (3) 2 I is he raio of he difference beween he nominal hickness and minimum hickness by he nominal hickness of he pipe. When expressed in he percenage Thickening c = min (4) I is he raio of he difference beween he maximum hickness and nominal hickness o he nominal hickness of he pipe bend. When expressed in percenage

3 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April ANALYSIS c Maximum ouer diameer = max (5) I is he maximum diameer of pipe where he bending occurs Minimum ouer diameer D max = D o + 2X (6) I is he minimum diameer of pipe where he bending occurs METHODOLY D min = D o 2X (7) Firs we are going o find he problem faced in he pipes hen by using experimenal seup and ANSYS sofware we are going o evaluae he resuls and hen we will compare he values and obain he resuls FINITE ELEMENT ANALYSIS The finie elemen model and analysis are carried ou by using he sofware ANSYS or ABAQUS.Then we are going o impor from iniial graphics exchange specificaion (IGES) o analysis package. We are going o use mesh elemen size as 3mm.hen we are going o apply boundary condiion.we are going o find wih on bend secion, wih on axis line and wihou on pipe bends. MESHING Meshing is he mos imporan feaure in analysis sofwares. Meshing is an inegral par of he compuer aided simulaion sofware. when load is applied on he srucure or body he load is disribued uniformly on he srucure.we have given he mesh as 3mm. EXPERIMENTAL AND FEA ANALYSIS VALUES Pressure Experimenal Deformaion FEA

4 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April DEFORMATION Experimenal FEA PRESSURE (BAR) Graph ploed for pressure and deformaion Experimenal Seup: RESULTS AND DISCUSSIONS The applicaion of inernal pressure changes he way of pipe bend behaves under inernal pressure loading, no only in erms of is load-deflecion behavior, bu also in erms of disribuion of sresses and srains. In his sudy, Sress analysis of sainless seel pipe wihou aached pipe was developed and ploed o he various ovaliy in pipe bend. The resuls indicae ha he pipe ha mees he specified minimum sress is no appreciably failure up o he 20% ovaliy. Ovaliy 20%,pressure 26 bar Wihou wih on bend secion wih on axis line MTD= MTD= MTD=1.6429

5 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April Ovaliy 20%, pressure 22 bar Wihou wih on bend secion wih on axis line MTD= MTD= MTD=1.637 Ovaliy 20%, pressure 18 bar Wihou wih on bend secion wih on axis line MTD= MTD= MTD= Ovaliy 20%, pressure 14 bar Wihou wih on bend secion wih on axis line MTD= MTD= MTD= Ovaliy 20%, pressure 10 bar Wihou wih on bend secion wih on axis line MTD=2.923 MTD= MTD=1.6214

6 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April Compare o hree of hem wih on bend secion can wihsand more pressure Maximum Sress Value For Pipe Bend Ovali y pre ssu re Toal deform aion Wihou Equiva len(vo n- mises) sress Wiho u Equivalen elasic srain Wihou Toal deform aion wih on bend secion Equiva len(vo n- mises) sress wih on bend secion Equivalen elasic srain wih on bend secion Toal deforma ion wih on axis line Equivalen( von-mises) sress wih on axis line Equivalen elasic srain wih on axis line 0% % % % % % CONCLUSION: In his sudy, Sress analysis STAINLESS STEEL pipe was developed and ploed o he various ovaliy in pipe bend by using and wihou. The influence of ovaliy on variaion of von mises sress, oal deformaion and sress inensiy of pipes are calculaed by ansys sofware and for experimenal we are using as pressure and we calculae he ovaliy of pipe. I is subjeced o many differen kinds of loading bu for purpose hree caegories of codes of loads susained load, occasional load and expansion load. Compare o hree of hem wih on bend secion can wihsand more pressure load

7 Inernaional Journal of Scienific & Engineering Research Volume 9, Issue 4, April REFERENCES 1. S.Sellakumar and R.Venkaasamy(2015). Review of srucural assessmen of pipe bends. Inernaional review of MechanicalEngineering2013.vl7.n.6.pp T. Chriso Michael*, A.R. Veerappan, S. Shanmugam. Comparison of plasic limi and collapse loads in pipe bends wih shape imperfecions under in-plane bending and an inernal pressure. Inernaional Journal of Pressure Vessels and Piping vl.99.pp A. R.Veerappan and S. Shanmugam. Analysis For Flexibiliy In The Ovaliy And Thinning Limis Of Pipe Bends. ARPN Journal of Engineering and Applied Sciences.2008.vl.3.pp B. G. Teng, Hu and S. J. Yuan.Deformaion behavior of hin-walled ube bending wih inernal pressure Ocober 17, 2013.Vl.134.pp Andrea Cainaccio. Pipes under inernal pressure and bending.journal of Pressure Vessel Technology. February 4, vl.134.pp T. Chriso Michael*, A.R. Veerappan, S. Shanmugam(2011). Comparison of plasic limi and collapse loads in pipe bends wih shape imperfecions under in-plane bending and an inernal pressure. Inernaional Journal of Pressure Vessels and Piping vl.99.pp Chriso Michael T, SushruBugde, Srikanh K January Deerminaion of safe sress limi of high-pressure pipe bends used in chemical indusries.vl.30.pp J.m.pardala,.c.desouza,e.c.leaob, m.r.dasilvac, s.s.m.avaresaocober 17, faigue cracking of high pressure.inernaional journal of pressure vessels 9. V. Polena, S. D. Garvey, D. Chronopoulos, A. C. Long, H. P. Morvan2015. Effecs of pipe curvaure and inernal pressure on siffness and buckling phenomenon of circular hin-walled pipes. Journal of Mechanical Science and Technology. vl.22.pp Mu Seong Chang, Young Il Kwon and Bo SikKang(2009). Design of reliabiliy qualificaion es for pneumaic cylinders based on performance degradaion daa. Journal of Mechanical Science and Technology vl.28.n.12.pp