OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
The coefficients , are found by using the young’s modulus (E) and Poisson ratio (ν) in the equations below :
These equations are discretized using a suitable scheme and then a convenient numerical method may be used to
solve these equations.
DEVELOPMENT OF THE MODEL
Fig 3 Simplified Vane Geometry
The simplification is carried out as follows:
i. The vanes are symmetrically placed about all the three axes and thus the deformation of each vane will be similar
at a given point inside the pump bore.
ii. Further, the material is isotropic.
iii. The above observations are sufficient to simplify the geometry by considering only one vane.
iv. Also unnecessary rounds, embossing etc are removed for better meshing.
Thus to find the maximum stress distributions over the whole impeller we have to analyze the motions of a single
vane at the instant when motion starts.
The significant point to be kept in mind is that the vane is just tending to move, thus the friction at contact surfaces is
static. To model contact, infinite friction is used.
The loads are as follows:
i. A moment load of 549 mm-N at center of the impeller calculated using the motor torque data and the
impeller radius.
ii. Pressure loading on vane sides to simulate pressure differential.
iii. Vane tip, base of vane and one face of the vane are constrained to simulate friction
The software used is Pro/Mechanica and the geometry is built in Pro/E wildfire5.0.The maximum element size is
1mm and thus about 5 million quad elements are formed. The simulation is run on a 4 core 8GB RAM system and
takes about 48hrs to complete.
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