Stress Analysis of Reactor with composite material by FEA

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1 ISSN Stress Analysis of Reactor with composite material by FEA #1 Anup wani, #2 S.S Nehe, #3 M.Chamnalli 1 wanianup23@gmail.com 2 nehe2020@gmail.com 3 maheshwarchamnalli@gmail.com 1, 3 Department of mechanical engineering, Savitribai Phule Pune University Dhole Patil college of engineering, Pune, India 2 Sachin S.Nehe Shree Ramchandra College of Engineering, Pune, India ABSTRACT The ASME Pressure project in conjunction with the ASME codes used for the Design and testing of Composite. The survey as well as study of elliptical head has low stresses distributed as compared to other heads, so for most of the applications elliptical heads are selected for the analysis of fibre glass composite with elliptical head, and its analysis is done by using FEM. The same is validated experimentally with the help of strain gauges. The Pressure is designed as per ASME standard for 7.8 bar and m in diameter and m long. The Pressure was tested to validate the effect of stresses on structure of laminated composite overlapped by varying the values. The experimental and numerical performance of under internal shows that the stresses and deformation in composite is minimum as compared to the steel and also it is observed that the weight of composite is reduced by 35%. Also the corrosive resistance property of the composite material is superior to that of steel so as to increase life of the component. A fibre glass gives has a greater stiffness and ultimate strength that of mild steel for the same thickness. ARTICLE INFO Article History Received :18 th November 2015 Received in revised form : 19 th November 2015 Accepted : 21 st November, 2015 Published online : 22 nd November 2015 Keywords Pressure Vessel, Reactor, Stress analysis, FEA. Composite material, strain gauges. I. INTRODUCTION This paper, dealing with the stresses in a with an elliptical head, is part of a continuing program instituted by the Design Division of the Pressure Vessel Research Committee of the Welding Research Council of the Engineering Foundation. This program, which consists of both software and experimental investigations, is intended to benefit engineers engaged in the design and manufacture of s. A common design is a cylinder with elliptical end caps called heads. The increasing use of under different conditions of, temperature, operation cycle, contained fluid properties etc., has given special importance to analytical and experimental method for determining their operating stresses. Development in nuclear and chemical industry places new demand of finding most likely method of damage, method of stresses analysis and its reliability of result. The is designed for a 8 bar of internal, 1bar atmosphere of external, It is a Horizontal type of Reactor. Pressure is the main body of the pneumatic Booster. An operating of 8 bar for testing of s and other application. The reservoirs are subjected to internal or external s are referred as. The Reactor is used to store fluids or air under. The Liquid or air being stored may undergo a change of state inside the Reactor as in case of steam boilers or it may combine with other reagents as in chemical plants. Reactor find wide applications in thermal

2 and nuclear power plants, process and chemical industries, in space and ocean depths, and in water, steam, gas and air supply system in industries. II. LITERATURE REVIEW Consideri Considering the fact that required thickness of hemispherical head for internal loading is only half of that necessary for the cylindrical shell, publishers have tried to develop a finite element model taking due consideration on welding involved at the end connections of cylinder to shell end in modeling using shell elements to model cylinder. Some heads are tested under FEA for the cause of resulting weight reduction of %. The larger the shell in diameter the more the economic benefits it achieves[1]to find out the stresses at the interaction between cylinder walls and end caps; When modeled correctly, F.E.A. proved to be useful, but the Analyzer also needs to be able to interpret the results properly. For the validation of F.E.A. result; the measurement of stresses by the experimental method is necessary. The publisher should be able to approximate the solution using classical methodology in order to verify the solution.[2] This domain represents the results of computations for determining the stresses in a with a conical head. The accurate bending theory of shells is used to evaluate the local bending stresses in the neighborhood of the junction of the conical head and the cylindrical body. In a cylindrical Reactor with a conical head, the highest effective stress is the axial stress at the junction. It may be located in the cylinder or the cone. To minimize the stress, it is desirable to make the cone and cylinder equally thick if the angle does not exceed 45 deg.[3] in this paper expands with accumulation of plastic strain. Both racketing strain and viscoplastic strain rates reduce with the increase of elastic domain, and the total strain will be saturated finally. a physical experiment of a thin-walled subjected to cyclic internal has been carried out to verify the feasibility and effectiveness of this noncyclical method. By comparison, the accumulated strains evaluated by the non-periodic method agreed well with those obtained from the experiments. The non-periodic method is simpler and more practical than the cycle-bycycle method for engineering design. [4] In this study an analytical solution for elastic thin-walled cylinder- truncated cone shell intersection under internal is presented. Although the different intersection problems had been solved by the various methods, due to complicity of the general theory in cone, this problem has not been considered so far. The authors used edge solution to calculate stresses in circumferential and longitudinal directions. The results show that the stresses in vicinity of the intersection location can be exceeded even more than two times of the membrane stresses in some apex angle of the cone. This emphasizes on the effects of the apex angle of the cone in diversion from the membrane theory prediction.[5] III. MATERIAL PROPERTIES AND DESIGN CALCULATIONS The has been designed considering various parameters such as internal, volume etc. based on ASME codes. For the required quantity of fluid to be stored, the length and diameter of the have been chosen according to the codes and requirements. Material Properties and Design Parameters Sr.No. Properties Steel Fibre glass 1 Density of material 2 Modules of elasticity 3 Poison s ratio 4 Operating 5 Inside diameter 6 Cylinder length 7 Permissible stress Kg/m 3 Kg/m 3 2 x x10 5 N/mm 2 N/mm bar 5-8 bar 250 mm 250 mm 420 mm 420 mm N/mm 2 N/mm 2 8 Welding 100 % 100 % efficiency 9 Capacity 24 lit 24 lit Design Calculations 1. Shell Calculations = =1.5*10-3 m (t) =1.5mm 3 mm Length of the shell = 420mm Internal diameter = 250 mm 2. Hemispherical head Calculations[7] Thickness (t) = = (t) = 0.715m 3. Ellipsoidal Head calculations Thickness (t) = = (t) = 1.503mm 4. Flanged and Dished head calculations Thickness (t)= = (t) = 1.62mm 5. Conical Head calculations Thickness (t)= (t) =1.46mm TABLE 1

3 IV. FINITE ELEMENT ANALYSYS Finite element analysis is a powerful tool in the field of engineering. While finite element analysis offers another way to analyze structures, it requires an understanding of the program and subject being modeled. The stress Analysis with the help of Finite Element Method is necessary to find out the exact behavior of.to find out the stresses at the interaction between cylinder walls and end caps. FEA proved to be useful, but the operator also needs to be able to interpret the results properly. This project set out to explore applicable methods using finite element analysis in analysis. Fig.3 Total deformation in steel Fig.1 meshing of steel Meshing of for static structural analysis is shown in fig.1 tetrahedral mesh element is used for the meshing to improve the mesh quality and it also improves closeness of the result. The size of tetrahedral mesh element is kept medium. Fig.2 shows boundary condition applied on the i.e on fixed saddle support as shown in yellow shaded part in fig.2 keeping displacement in x,y and z axis is 0. And of 8*105 Pa. is applied on the all inner faces of the. Fig.4 Von-misses stresses in It is observed that the maximum deformation is mm occurs at shell of the and maximum deformation occurs at the end is mm as shown in fig. 3 and fig.4 shows that the von-misses stresses occurs in both shell and heads are N/mm 2 and N/mm 2 respectively. Fig.2 Boundary conditions applied on Fig.5 Total deformation in composite

4 =33.63 N/mm 2 Analytical stress calculations 1) Shell stress calculations σ long = pr/t =8 x10 5 x125 x10-6 / 3 = N/mm 2 σ hoop = pr/2t = 8 x10 5 x125 x10-6 /2 x 3 = N/mm 2 2) Head stress calculations Fig.6 Von-misses stresses in composite The meshing and Boundary condition of composite steel is same as steel which is shown in fig.1 and fig. 2 It is observed that the maximum deformation is mm occurs at shell of the and maximum deformation occurs at the end is mm as shown in fig 5 and fig 6 shows that the von-misses stresses occurs in both shell and heads are N/mm2 and N/mm2 respectively. σ head = pd/2t = 8 x 10 5 x 250 x10 6 / 2x3 = N/mm 2 Composite material 1) Shell stress calculations E 2= 1/e ( σ 2 - µσ 1 ) 28=1/0.72 x10 5 (σ σ 1 ) E 1 =1/e (σ 1 - µσ 2 ) 123=1/0.72 x10 5 (σ σ 2 ) SOFTWARE RESULT TABLE TABLE II Result of steel and composite Types Of Steel Pressure Composite Weight (kg.) Deformation(mm) Von-misses stresses(mpa) Shell Head Shell Head From the software results von misses stresses are induced in composite is less than the steel so design is safe based on the strength and rigidity criteria. V.EXPERIMENTAL STRESS CALCULATIONS Steel 1) Shell stress calculations E 2= 1/e ( σ 2 - µσ 1 ) 45=1/2.1 x10 5 (σ 2-0.3σ 1 ) E 1 =1/e (σ 1 - µσ 2 ) 116=1/2.1 x10 5 (σ 1-0.3σ 2 ) By solving equation 1 and 2 we get, σ 1 = N/mm 2 and σ 2 =18.41 N/mm 2 2) Head stress calculations σ head =E x e = 2.1 x 10 5 x 160 x 10-6 By solving equation 1 and 2 we get, σ 1 = N/mm 2 and σ 2 =9.840 N/mm 2 = 10 N/mm 2 2) Head stress calculations σ head =E x e = 0.72 x 10 5 x 198 x 10-6 = N/mm 2 Analytical stress calculations are as above steel. V. EXEPERIMETAL SETUP Pressure s are a commonly used device in engineering. The stress Analysis with the help of Finite Element Method and Experimental Method is necessary to find out the exact behavior of.to find out the stresses at the interaction between cylinder walls and end caps; Whenever the model appropriate, F.E.A. proved to be useful, but the operator must have the ability to interpret the results properly. For the validation of F.E.A. result; the measurement of stresses by the experimental method is necessary. The analyst should be able to approximate the solution using classical methodology (hand calculations) in order to verify the solution. This project set out to explore applicable methods using finite element analysis in analysis. From the software results, Reactor which gives the optimum results is selected for the experimental validation. Hence need to make the setup which gives the actual condition. The experimental setup of measure the stresses of the testing consists of 4 steps, 1) To manufacture two s one from steel and another from fiberglass.

5 2) Taking the measurements of strains by using strain gauges and calculates stresses. 3) Analyzing the measured test data. 4) software results are validates with Experimental EXPERIMENTAL SETUP The experimental Setup consists of different parts Steel Fiberglass Foil type s(1000ω, gauge factor 2.1,polyamide base) Air compressor(10 bar,2hp,220v,24l,) 4 channel strain gauge indicator Pressure gauge indicator Pigtails Wires indicator proportional change in the resistance of the strain gauge once the deformation value gets after that it is very easy to find out stresses value by using stress-strain formulae. This setup is very easy and useful for finding the stress values experimentally. VI. RESULT & DISCUSSION With the help of Finite element analysis and experimentation we can study the actual stress distributions in the different types of and the actual behaviour of. Types Of TABLE III COMPARISON BETWEEN RESULTS OF ALL METHOD Von- misses stresses in N/MM 2 SOFTWARE RESULT EXPERIMENTAL RESULT ANALYTICAL RESULT SHELL HEAD SHELL HEAD SHELL HEAD Pressure gauge STEEL Steel Air compressor COMPOSITE Fig.7 Experimental set up of steel Fibreglass indicator Pressure gauge Air compressor Fig.8 Experimental set up of Fibre glass Working: The is applied periodically in by using air compressor arrangement. During this operation, the inlet port of should be open and outlet port should be closed. Pressure gauge indicator is placed on to record the amount of applied in it. To find out deformation in step by step increment is applied. Strain gauge wires are connected with the 4 channel strain gauge indicator. Later readings on strain gauge are recorded by applying equal intervals of. The maximum capacity of both steel and composite is 8 bars. This process is carried out for both steel as well as composite. Electrical Resistance strain Gauges are metallic resistors that can be pasted on the surface of a part on which you want to measure strain. When the part deforms the strain gauge deforms along with it. This deformation is reflected as a Table 2 shows the variations in the deformation and von misses stresses in different types of and its location is also changes. From the software results maximum von misses stresses are induced steel and is less in composite. So the composite design is safe based on the strength and rigidity criteria. VON-MISSES STRESSES IN N/MM shell head shell head shell head Software anylysis Experimental anylysis Analytical calculation STEEL COMPOSI TE Fig.9 Software and experimental results of von miss stresses in both types of s

6 VII. CONCLUSION. The composite developed the least stresses when compared to steel at same operating conditions. For the same thickness the stresses induced in composite lies in safe zone can be used for the safe working of the. Ultimately weight of the composite is lower than that of steel by 0.35%, without varying the thickness of elliptical end connection. The corrosion resistance of the composite is more than steel, which increase life of the. ACKNOWLEDGEMENT I would like to express my deep sense of gratitude to my supervisor Prof. Nehe S. S. And Prof.M.Chamnalli for his inspiring & valuable suggestions. I am deeply indebted to him for giving me a chance to study this subject & providing constant guidance throughout this work. REFERENCES [1] G. W. Watts, H. A. Lang, Chicago. Stresses in a Pressure Vessel With a Conical Head ASME TRANSACTIONS, 1952 pp [2] John Makinson, Norman L. Newhouse Flaw Testing of Fiber Reinforced Composite Pressure Vessels Journal of Pressure Vessel Technology 2014 by ASME AUGUST 2014, Vol. 136 / [3] A.H. Weisberg,S.M. Aceves, F.E.Loza,E.L.Orozco, B.Myers, Brian Spencer Cold hydrogen delivery in glass fiber composite s: Analysis, manufacture and testing International Journal o f hydrogen energy 3 8 ( ). [4] J. Zamani, B. Soltani, M. Aghaei. Analytical Investigation of Elastic Thin-Walled Cylinder and Truncated Cone Shell Intersection Under Internal Pressure,Journal of Pressure Vessel Technology by ASME, Vol. 136 / ,October [5] Siva Krishna Raparla, T.Seshaiah Design And Analysis of Multilayer High Pressure Vessels International Journal of Engineering Research and Applications (IJERA) ISSN: Vol. 2, Issue 1, Jan-Feb 2012, pp [6].L. P. Zick Stresses in Large Horizontal Cylindrical Pressure Vessels on Two Saddle Supports, the welding journal research supplement September [7] John F.Henvey Pressure Vessel Design -Nuclear and Chemical Applications An East-west Edition, Network, Chapter 5 and Chapter 7. [8] ASME Code Book Section VIII & Division I [9] Zuraidah sallehnor amalina nordinidris saad,institute of research,development andcommercialisationuniversiti teknologi mara40450 shah alam,selangor Malaysia,2006 [10] Yogesh Borse, Avadesh Sharma Modeling of Pressure Vessels with different End Connections using Pro Mechanica International Journal of Engineering Research and Applications (IJERA) ISSN: Vol. 2, Issue 3, May-Jun 2012, pp [11] ANSYS 14.0 Release

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