# Homework, Quizzes, Simulation Examples — Computational Resource Considerations — Lesson 5

### Simulation Examples

Several simulation examples are provided here. Each of them comes with a description file, video instruction, and Ansys simulation file. All of the simulations are conducted using Ansys simulation software. Download the student version of Ansys software here.

#### (1) Snap-fit buckle analysis

The snap-fit buckle is a widely used connection in daily life. The buckling process comes with a sudden release of strain energy and can be challenging to simulate. Check out this simulation and find out how nonlinear stabilization helps convergence. Download  the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

#### (2) Impact of a Metal Cylinder on a Rigid Wall

What happens when a soft cylindrical bar impacts a rigid wall? Too expensive or time-consuming to do an experiment? Let simulation tells you the answer. Check out this impact simulation. And don't forget to think about what role the Newton-Raphson method playsin this scenario. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

#### (3) Rubber Boot Seal

Although you may not see them in daily life, rubber boot seals are used in many industrial applications to protect the flexible joint between two bodies. In the automotive industry, rubber boot seals cover constant velocity joints on the driveshaft to protect them from outside damage. This is a perfect simulation example to demonstrate geometry, material, and contact nonlinearity using the Newton-Raphson method. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

#### (4) Bending of a Fishing pole

This model shows the bending of a fishing pole. In this non-linear problem, we update the stiffness of thin structures with large deflection. In the process, we will see the iterations (as per the Newton Raphson method) the solver takes to achieve convergence as loading increments are added until the entire load is applied. Download the zip file and extract the contents. Go through the Readme file. Follow along with the provided How To Video file.

### Homework

#### (1) Inflation of a balloon

Inflating a balloon is a highly nonlinear process, as it involves large deformation and material nonlinearity. Replicate the simulation and answer the following questions.

1. This 3D problem is simulated using a 2D axisymmetric model. What are the benefits and shortcomings of this approach?
2. What is the critical location of the balloon at the end stage? How do the boundary conditions control the critical locations? (You are encouraged to modify the boundary conditions and see how they affect the results.)