Me2353 FINITE ELEMENT ANALYSIS
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This document contains a question paper for the Sixth Semester Mechanical Engineering examination covering the topic of Finite Element Analysis. It includes 20 short answer questions in Part A and 5 long answer questions in Part B. Some example questions are on distinguishing between analysis methods, defining terms, providing examples of different problem types, deriving element characteristics, and solving physical problems using various finite element techniques. Students are required to answer all questions in the allotted time of three hours.
Me2353 FINITE ELEMENT ANALYSIS
- 1. Question Paper Code : 23856 B.E./B.Tech. DEGREE EXAMINATION, NOvEMBER/DECEMBER 2018. Sixth Semester Me~hanical Engineering ME 2353 :_FINITE ELEMENT ANALYSIS. ~ '- . - : . (Common to Automobile Engineering, I~dustrial Engineering and Management, Mechanical and AutomationEngineering and Mechanical Engin~ering (sandwich)l .. . (Regulations 2008) Tiine : Three hours Maximum: 100 marks ... Any missing ciata may be suitably assumed. An~wer ALL questions. PARTA- (10 x 2 = 20marks) 1. Distinguish between the Rayleigh-Ritz method and :6Dite.element method. 2. .. vv.ha.t do you understand by the· terin "Piecewise continuous function"? 3. . Differentiate global and local coardinates: ' 4. What are the types-of prol>lems ~reated as ook dimensional problems? 5. Write down the sha~ functions .associated with the three noded linear triangular ele.ment and plot the variation of the· same. 6. Give atJeast on~ example each for plane stress and· plane strain analysis.. / ~ ' . . ' . 7. Consistent mass matrix gives aCcui'ate results than lumped mass ma~rix in dynamic analysis of bar element -,Justify. 8. · · What types of analysis preferred in FEA when the structural member subjected to transient Vibrations'? 9~ What" are the boundary conditions :i:ri. FEA heat transfer problem?~ . . ., 10. State Darcy'slawoffluid {low for finite element analysis. BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 1
- 2. PART B - (5 x 16 :::= 80 mark&) 11. (a) Solve the differential equation for a physical problem expressed· as d2 - .· . ---{ + 100 == 0, 0 s·x :s; 10 with boundary conditions as y(O) == 0 and dx. ·y(10) == 0 using~ (i) point C<?llocation. method (4) (ii) sub domain collocation method (4) (iii) least squar~s method and (4) ·(iv) Galarkin's method. (4) '....· (b) A simply supported beam subjected to uniformly distributed load over entire span and it is subjected to a point load at the centre of the span. Calculate the defleetion using Rayleigh-Ritz method and eompare with exact solutionS. · 12. (a) A steel bar of length 800 mm is subjected to anaxial load of 3 kN as ·shown in fig~ ~-· 12 (a). Find _the elongation of the bar, neglecting self . weight. (16) . 800mm j ·akN. Fig..Q12£&> · Or (b) Derive the stiffness matrix for 2D trUss element. (16) ·2 23856 ' BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 2
- 3. 13. (a) · For the plane· strain elements shown in Figure 13(a), the nodal displacements are. given as~ =0.00Smm,v1 :::::.0.002mm, .u2 = O.Omm, v2 = O;Omm,· u3_=0.005 m·m,v3 =·0~30mm~ . Determi~e the element stresses and-the principle angle. Take ·E =70GPa and Poisson's ratio=' . ' 0.3 and use unit thickness for plane strain. All coordinates are in mm. -. y Fig. Q. 13 (a) , Or ..• . . (b) · Derive the element characteristies ofa nine node quadrilateral element._ -~ . . 14. (a) Determine_the first two natural frequeooes of transverse Vibration of the cantileyer beam shown in Fig. 14 (a) and plot the mode shapes. Fig. 14 <a>- Or l (b) Determine the first two natural frequencies of longitudinal vibration of the bar shown in Fig. 14(b) assuming that the bar is discretised into two elements as ~_how~, E and p represent the Youngs Modulus and mass density of t_!le material of the bar. · Ul l=L/2 ·us. l =L/2 .. Fig.14 (b) .3 23856 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 3
- 4. 15. (a) Consider a brick wall of thickness 0;3 m, K = 0.7WI m ·c. The inner surface is at 28°0 and the outer surface is exposed to coid a1r at -15°0. The heat transfer coefficient assoc.iated with the ·outside surface is 40WI m2 ·c. Determine the steady state temperature distributi6n witliin the wall and alsO the heat flux through the wall. Use two lD elements and obtain the solution. Or (b) Establish the finite element equations including force matrices for the analysis .of two dimensional steady·state fluid flow through a porous · ·medium·using triangular element. 4 23856 BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 4