VTU Mechanical Engineering (Semester 6)
Finite Element Methods
May 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) Derive the equilibrium equations of a three dimensional body subjected to a body force.
8 M
1(b) Explain the general description (steps) of FEM.
6 M
1(c) Briefly explain the types of elements based on geometry.
6 M

2(a) State principle of virtual work and principle of minimum potential energy.
4 M
2(b) Calculate an expression for deflection in a simply supported beam under uniformly distributed load Po ever entire length L using Rayleigh Ritz method.
10 M
2(c) What are the steps involved in Galerkin's method to find out deflection?
6 M

3(a) Explain two dimensional Pascal's triangle.
5 M
3(b) Define interpolation polynomial,
simplex,
complex and multiplex elements and cubic element.
5 M
3(c) Find the shape function of a CST element and plot the same.
10 M

4(a) FigQ4(a) shows a thin plate of uniform thickness of 1 mm, weight density = 76.6×10-6 N/mm3 and subjected to point load of 1kN at its midpoint. Take E = 200 Gpa. Evaluate nodal displacement,
stresses and reaction. Using elimination techniques.
!mage
10 M
4(b) Find the nodal displacement,
stresses and reactions of a Fig.Q4(b). Using penalty approach method.
!mage
10 M

5(a) Obtain the shape functions of quadratic bar element.
10 M
5(b) Use two point Gauss quadrature to evaluate the integral \(I=\int_{0}^{3}\left ( 2^\S -\S \right )d\S . \)
10 M

6(a) Derive an expression for stiffness matrix of a 2 noded truss element.
10 M
6(b) Determine the nodal displacement in the truss segment subjected to concentrated load as shown in Fig Q6 (6).Take E= 70GPa A=0.01m2.
!mage
10 M

7(a) Obtain Hermite shape function of a beam element .
10 M
7(b) Find the deflection at the tip and the support reaction of cantilever shown in Fig.7(b).
!mage
10 M

8(a) Obtain the governing equation of one dimension heat conduction.
10 M
8(b) Calculate the tempreature distribution in a one dimensional fin with the physical properties shown in Fig 8(b).There is a uniform generation of heat inside the wall of\(\bar{Q}=400W/m^3 \).
!mage
10 M



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