In this lesson, we will define and solve a nonlinear static stress study. After completing this lesson, you'll be able to select a study material, create study loads and constraints. Modify mesh settings, and solve a simulation study. For this next lesson, we're going to start with a new blank file and we're going to create a nonlinear response analysis. And to do this, we're going to take a basic look at a very basic part. We'll try to understand what's going on behind the scenes of a nonlinear simulation. So to get started in a new untitled document, we're going to create a sketch. We're going to use the top plane and a center point rectangle. It's going to be located at the origin and it's going to be 10 millimeters by 10 millimeters. We then want to extrude this up a distance of 200 millimeters. And essentially what we've created is a very small thin column. We're then going to save this file and we're going to call this one, Thin Beam. Make sure that you save it in an appropriate location for this course. In my case, I'm going to go to Course 3 and Week 3 and save my Thin Beam file. From here, we're going to navigate to the simulation workspace and we're going to create a nonlinear static stress simulation study. It's important to understand the difference between a static stress simulation and a nonlinear static stress stimulation. When we're exploring a static stress simulation study, we're assuming the response of the material is linear. Meaning that as we apply a load to it, when we remove that load, it's going to return back to its original shape. This simulation process is fine as long as the response is linear in the range in which we're looking. However, if we get to the point where we've exceeded that linear behavior. Then we need to take a look at a nonlinear static stress study. This can be something like deforming a chair past the point where it returns or springs back to its original shape. So we're going to be taking a look at this simple beam structure and how we can apply this nonlinear response to it. To get started, we first want to take a look at study materials. It's important to understand the properties associated with the study materials, steel is the default material on Fusion 360. So I'm going to navigate to the Properties and notice that there is no component selected. But as soon as we select this information, some properties are displayed here. If we change the Material Library, you'll note that Fusion 360 contains a Nonlinear Material Library. When we navigate to this, we have a handful of materials that we can choose from. We're going to be using Aluminum Pure Low Strength in this case. And notice the properties on the right hand side are using advanced properties. We need to select this material and we're going to be using the Pencil Icon. And displaying the physical materials in the Advanced Properties section. Inside of here, we have Material Model which is default to Isotropic. But there's also a Hyperelastic setting, the material is Nonlinear, but there's also a Linear and a Temperature Dependent. And the type is Plastic, Elastic or an Elasto-plastic or Bi-linear material. We're going to be using an Elasto-plastic material. Which means that in a certain range, it's going to behave like an elastic material, springing back to its original shape. And past a certain point, it's going to be behaving like a plastic material, where it deforms and does not return to that original shape. Note that when we're using this definition, we have a Plastic and a Yield Function parameter. We're going to be using these, applying this setting and then closing out our material dialog. Now that we've applied that physical material, we need to start to finding our constraints and loads. We're going to select Structural Constraints and simply make the bottom of this body fixed. And then we want to apply a load to the top of it. We're going to be using a simple Force load, I'm going to modify the units and change it to pound force. And then we're going to add a value of 75. However, I'm going to make a slight adjustment to the angle. If I view this from the front, I want to rotate the force so that it's at a -20 degree angle. So we'll need to manually enter this value of -20 and then we can say OK. Because we're dealing with a single body, we don't have to worry about contacts between multiple bodies. We can see that the study has all the required information. There is one more thing that I want to make sure we do and that's going to Manage > Settings. When we're dealing with a nonlinear static stress study, we have a number of steps for the simulation. And depending on the complexity of the problem, we want to be sure that we increase this. I'm going to set this to a value of 50 and the problem we might run into is if this value is set too low. Then we might not be able to get to a convergence point, so we want to make sure that we have that at a high enough value. You can always start it with 10, and if the simulation fails, you can readdress that number. I also want to make sure that we address the Mesh element size. I'm going to reduce the slider value down and we will get a warning saying that below 3% is going to increase the processing time. But we're going to say OK and allow it to process at that lower value. It's important, especially when we're dealing with these nonlinear response problems. That we have mesh elements that are stacked inside of the thickness of our material. Now, in this case, we're dealing with a 10 millimeter by 10 millimeter piece. So the mesh element size, 3% of that, is going to give us enough resolution inside of the body. From here, we can select Solve, but it's important to note that while a static stress simulation study can be solved locally. The processing that happens for a nonlinear static stress study is more computer intensive. So we need to make sure that we use a On Cloud simulation model and note that it does require 25 Cloud credits. So we're going to select Solve 1 Study, allow this to solve and we'll check back in once the results are finished.
