# OS-E: 0910 Shell Cantilever

Demonstrates how size optimization can be used.

## Model Files

Refer to Access the Model Files to download the required model file(s).

The model file used in this example includes:

size1.fem

## Model Description

For the cantilever beam, a thickness distribution is sought that minimizes the structural mass and allows a limited vertical deflection of the loading end. The displacement is limited to 2.0mm.

The thickness for each element is varied. Therefore, five variables are defined in the analysis deck. The initial thickness of all elements is 2mm. All thickness variables have a lower bound of 1mm and an upper bound of 3mm.

The optimization problem, objective and constraint functions, is defined in the same manner as for the other types of structural optimization. OptiStruct then goes through an iteration process to solve the optimization problem. OptiStruct converged after 3 iterations.

## Results

Element 1 | Element 2 | Element 3 | Element 4 | Element 5 | Disp | Volume | |
---|---|---|---|---|---|---|---|

Initial | 2.0mm | 2.0mm | 2.0mm | 2.0mm | 2.0mm | 2.5mm | 400.00mm^{3} |

Final | 2.6mm | 2.3mm | 1.9mm | 1.5mm | 1.0mm | 2.0mm | 373.204mm^{3} |