FEA Uncertainty, SolidWorks FEA

 

1. Find the following parts and provide the part numbers. (9 pts)
a) Fastener, slightly corrosive environment, strength required =100 Ksi, pitch = 2mm, diameter =
14 mm, length = 60mm, thread length = 34mm, hex head (mcmaster.com)
b) Rack and pinion, high load, pressure angle = 20°, face width = 1.5”, pitch diameter = 3.5”, length
= 2’ (mcmaster.com)
AC to AC transformer, 120V input, 3A max current (mcmastercar.com)
2. Answer the following regarding the uncertainty in FEA reading. (5 pts)
a) What is the minimum number of element through the thickness of a curved component using
quadratic elements?
b) Between stainless steel and cast iron, which material properties are generally more repeatable?
c) What is the greatest source of FEA uncertainty that you can control?
d) Why are boundary conditions like pins and rollers used?
Is a basic SW FEA solution valid if your component experiences large displacements?
3. Create a static analysis for the shelf bracket model and perform a mesh refinement study. Use Nylon
6/10 for the material, 50 lb for the force on the front area, and global size controls for the mesh.
Produce a plot of number of nodes vs Factor of Safety and use at least 5 points. What is the FoS
convergence value and number of nodes required? (10 pts)
4. Once your mesh refinement study has been completed, perform a material selection study by
comparing the minimum factors of safety and component weight for at least 5 materials. Produce a
plot with materials labeled. (5pts)

Sample Solution

Developing countries have been able to achieve improved productivity and specialization through adoption of technologies that have been introduced in their countries by other developed countries through trade liberalization. For example, India has evidenced comparative advantage by employing labour intensive production skills in manufacturing and services that employs intensive skills as in software industries. This has led to its increased exports in its production to other Asians countries thus increasing its revenues and gross domestic income that has played a major role in its economic development. High technologies attract foreign investors and investments increase. Increased investments in the developing countries also results to significant decrease in levels of unemployment. Consecutive increase in exports from developing countries has been due to decreased barrier and reduced tariffs (Johnston, et al 2011, free trade). Therefore, it can be concluded that free trade is has helped countries to advance economically and realise their economic goals such as millennium development goals.

Free trade has led increased access of economic resources to developing countries and utilization of limited available resources thus stimulating their economic and social development. Small developing countries struggle with scarce and underutilised resources. Free trade allows free entry of other countries and investors to small developing countries and as a result, they participate in conversation of the available resources to economic development resources through ‘mobilization of capital and labour thereby improving the status of the country in the economy’ (Unger, 2010 P 171). Moreover, free trade gives small developing nations chances to obtain resources such as capital from already developed countries that assist them to attain economic development resources or utilize what they have. For example, countries from Asia such as India have developed due to trade liberalization where they have been able to obtain capital, labour and other necessary resources from already dev

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