3895

3678

كارشناسي ارشد

ساخت وتوليد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1386

ده، 115، [II]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

محمود فرزين

محمود رضا فروزان

8/2/87

محمود سليمي، حسن خادمي زاده

1396/03/08

كتابنامه

مكانيك

مهندسي مكانيك

ID3678

به فارسي وانگليسي:قابل رويت در نسخه ديجيتال

AbstractThe importance of nuclear power stations and refineries which are the heart of the productionand energy is very clear for every one Piping systems are the commonest thing in all of them One of the most sensitive part in piping systems is bends This thesis has investigated the best method for bending large diameter pipes with relativelysmall bend radii This method is called Induction Bending In order to get the benefits of thismethod a comparison with the other methods for pipe bending is presented and it wasrealized that this method is the best one for bending large diameter pipes with small bendingradius To evaluate this method an elasto plastic coupled thermo mechanical model was built tosimulate induction bending of large diameter pipes Local induction heating bending largediameter tubes with small bending radii and rapid cooling of the tubes after bending processwere considered in these simulations using ABAQUS software Mechanism of metaldeformation during the bending process was studied in detail Influencing parameters such asthinning and thickening of the tube wall thickness ovality of the cross section of the tube spring back angle after unloading and required push force were obtained These influencingparameters were compared with and without the presence of a reverse moment acting to thebending arm It was realized that an appropriate reverse moment should be applied to thebending arm to keep the wall thinning within a required and acceptable value In this investigation a simple analytical solution is also presented to predict forming conditionssuch as strains stresses tube geometry forces and moments The results are also comparedwith FEM simulations obtained by ABAQUS software and with available experimental data The results of analytical and FEM simulations are very well in agreement with experimentalobservations It was concluded that for a quick evaluation of the process the proposedanalytical solution is quite satisfactory Since the pipe after passing induction coils is cooled rapidly then the granular structure of thepipe changes To know more about one a computer simulation has been done on the pipe byAC3 software and has been shown that the surface of the pipe is only converted to martensite

محمود فرزين

محمود رضا فروزان

محمود سليمي، حسن خادمي زاده