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
3. Then the data is entered into the testing software and one-dimensional results are acquired. The tests involve
load conditions at Full Bump, Laden (Fig. 4), Unladen, Rebound and Solid height. The calculations are
solved and stored as a file known as a iterate.
4. The iterate is imported to the tool kit again. And the Load vs. Deflection graph of the designed spring is
plotted. This graph should meet with the customer requirement graph. It is seen whether the spring satisfies
the safety conditions for a safe design.
5. Along with the Load vs. Deflection graph, we get the axis and gap information from which we get the coordinates
of the spring. These co-ordinates are entered into SOLID WORKS 2006, 3D designing software,
to create a 3D model of the spring.
FIG. 4 SPRING PARAMETERS AT LADEN CONDITION
6. After completion, this model is sent for 3D FEM analysis to a company called Wave Axis. There the analysis
is done to see the stresses acting on the spring along with the deformation undergone in 3D and results
are sent back to Stumpp, Schuele&Somappa Pvt. Ltd. where the results are checked.
7. Upon approval, the production designs are made and sent to the production department to manufacture samples.
8. These samples are put through rigorous tests which include Fatigue testing and Static load testing. If the
spring passes, the customer is given all the details.
9. After receiving the go ahead from the customer and making any changes requested by the customer, the
spring is put into production.
4 STUDY METHODOLOGY
4.1 FEM Analysis
FEM is done for 3-dimensional models to analyse it in a more detailed manner [11, 12]. Firstly the entire model
is discretised into small elements and later it as meshed into the actual model. FEM uses a complex system of
points called nodes which make a grid called a mesh. This mesh is programmed to contain material and structural
properties which define how the structure will react to different loading conditions. Nodes are assigned at a certain
density throughout the material depending on the anticipated stress levels of a particular area. Steps involved
in FEM analysis-
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