Exercises

Exercise 1

Repeat the optimization problem in the tutorial but with four design variables: H, W, R, T (thickness). Use the same Young's modulus and Poisson ratio: 30 x 10^3 ksi and 0.3, respectively.

Constraints

Maximum effective stress < yield value (32.5 ksi)

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Submit:

1. Results from the Design of Experiments step
2. 3D response surface: (R,H) vs. Volume. In other words, plot R on the x-axis, H on the y-axis and Volume on the z-axis. See tip below for how to create such a plot in ANSYS.
3. 3D response surface: (R,H) vs. max. effective stress
4. Selected design point and the corresponding volume and max. effective stress
5. Effective (or Von Mises) stress variation in the plate at the design point

Tips

• One can pick the optimum value of the thickness just by inspection since the maximum effective stress doesn't vary with thickness for this problem. So you don't need to input thickness as a design variable in ANSYS, saving you work and time. Note: In a 2D problem, the thickness is used only to calculate the traction from an applied force (through dividing the force by an appropriate area). The thickness does not enter anywhere else in the 2D mathematical model. In this problem, the traction is a pressure load, which is independent of the thickness.

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