Exercise 1

A steel bar with E=200GPa and a Poisson's ratio of 0.3 is loaded as shown with a distributed load totaling 50,000 N applied to the right end. The bar is 10 mm thick, and other dimensions are give in millimeters.

a. Consider the left edge to be fixed and apply the load to the right end. Find the maximum stress and maximum displacement in the bar.

b. Create a path along where the dashed line is sown and record the maximum and minimum stress along this path.

c. Discuss how the maximum stress and maximum displacement change when the radius is reduced.

Exercise 2

Consider the bar shown below. The plate is made of A514 steel with a modulus of elasticity of 29e6 psi and a Poisson of 0.3. Assume plane stress conditions are valid. Obtain the finite-element solution for this problem using ANSYS.

Assignment:

1. Make a plot of the mesh.
2. Make a plot of the deformed shape. Include the undeformed shape in the same plot (this option is found by clicking on the "Edges" icon). Using this plot, discuss whether you have applied the boundary conditions correctly.
3. Compare the displacement at the right edge with a back-of-the-envelope estimate.
4. Make a plot of the Sigma_xx variation in the bar. Deduce the stress concentration factor for the hole on the right from this plot. Compare this to the theoretical value for a small hole in an infinite plate.
5. Determine how your stress concentration factor changes when you use a different mesh. Indicate the number of nodes and elements for your two meshes (this info can be found in "Details of mesh" when expanding "Statistics"). Also, include a plot of your second mesh.

Tips:

1. You need to constrain your ANSYS model adequately so that it doesn't fly off to Europa. The figure above doesn't specify any displacement boundary conditions. You can make use of symmetry to impose the y-displacement constraint. Additionally, add an x-displacement constraint to the left, bottom corner in the half-model. With these two displacement boundary conditions, the model is well constrained.

To impose the x-displacement constraint at the left, bottom corner, highlight Static Structural in the tree and use Supports > Displacement as shown in the figure below. Also, click on the "vertex selection filter" and then select the vertex that you need to constrain.  Constrain this vertex in the x-direction and allow it to be free in the y-direction.

2. You can save a copy of a plot using the following icon in the top menu:

Or you can use the Snipping Tool in Windows 7.

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