BIMEE-013 : FINITE ELEMENT ANALYSIS Maximum Marks : 70
Time : 3 hours
Note : Answer any five questions. Scientific calculator is allowed. All questions carry equal marks. 1.
(a) Explain the basic steps of Rayleigh-Ritz method. (b) Why polynomial terms preferred for shape functions in FEM ? (c)
2.
Define the term 'Stiffness Matrix'.
6 6 2
A beam AB of span 'I' simply supported at the ends and carrying a concentrated load 'W' at the centre 'C' as shown in Figure 1. Determine the deflection at the mid span using Rayleigh-Ritz method and compare it with exact solution. Use a suitable one term trigonometric trial function.
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W
A
4.0
Figure -1 BIMEE-013
1
P.T.O.
3.
A stepped bar, fixed both ends, is subjected to an 14 axial load of 200 kN at the place of change of cross section as shown in figure 2. Find : (a) The nodal displacements (b) The reaction forces (c) The induced stresses in each material. (1) (2) ► 200 kN
H— 300 mm
4
+ 400 mm
(1) - Aluminium bar (2) - Steel bar A1 = 2400 mmA2 = 600 mm2
= 70 x 103 N/ mm2 E2 = 200 x 103 N/mm2
Figure - 2 4.
Consider a 4- bar truss as shown in figure 3. It is 14 given that E =200 Gpa and A=500mm2 for all the elements. Determine : (a) Nodal displacements (b) Support reaction (c) Element stresses (4) 15 kN (2)
(3)
800 mm
11111
2
H1000 Figure - 3 BIMEE-013
2
10 kN
5.
Determine the deflection and stresses in three different sections of a composite stepped bar loaded as shown in the figure 4.
14
A
1. 4)15 mm 10 kN 4)10 mm Steel Cu Al E= 2.1 x 105 MPa E = 1.23 x 105 MPa E = 0.67 x 105 MPa 4:120 mm
Figure - 4 6.
(a) Use Hermite's interpolation formula to
7
derive cubic shape functions for the transverse deflection of beams.
7.
(b) Derive the local finite element stiffness matrix for a beam with combined transverse loading and axial force.
7
Derive the shape functions for a beam finite
14
element of length 'L' assuming a cubic polynomial in the form v(x) = a 0 + a i x + a 2x2 + a3x3 by satisfying the boundary conditions : v(0) = (0) u(L) = 0, v(0)=0 and u(L) =O.
Al E= 2.1 x 105 MPa. E = 0.67 x 105 MPa. E = 1.23 x 105 MPa. Figure - 4. 6. (a) Use Hermite's interpolation formula to. 7 derive cubic shape functions for the.
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