###
**Introduction**

Designing a product with good
quality costs the industry very high, and increases the product’s price. Because
a good quality product needs careful design, proper material, and long running
lifetime, we need to invest much money for this purpose. There are many aspects
to be considered to design an overwhelming product. Otherwise, the designed part
will fail.
One of the causes is not consciously considering and analyzing the
stresses due to the load on the part. We can easily calculate the stress on a
uniform part. Finding the stress on a groove or a shape changing portion is not
really easy and needs to be found very carefully because the stress on this
portion is very high comparing to other places of the part, and often the
failure occurs on this portion. Since finding the stress on the shape changing
portion is much complicated, we need to define a factor to simplify the
calculation and avoid time consumption. The factor is defined as the “stress
concentration factor (kt).” This factor is found theoretically and plotted in
different graphs, and is also possible to be found by using any “Finite Element
Method Software”, or any other experimental measuring devices such as strain
gage. In this project, we are assigned to find stress concentration factors
using commercial FEA software (preferably COSMOSWORKS). Since there are many
graphs of stress concentration factors for different shapes, I am assigned to
find the stress concentration factor kt for a U-shape grooved cylindrical shaft
in tension and bending which are the figures A-15-13 and A-15-14 in the machine
design text book’s appendices. The full report can be found from here

## No comments:

## Post a Comment