Linear Static Analysis
Linear static analysis is simply an analysis with 2 main assumptions:
- The analysis is linear – The relationship between the load applied to an object and the response of the object is linear.
- The analysis is static – Analysis of approximate conditions in which the applied load does not vary based on time, ignoring the inertial and damping forces.
Linearity means a lot of things:
- Small deformations
- The loads and the constraints don’t change in value or direction
- The material applied to the model is considered elastic
- That the relationship between loads and displacements is linear. This relationship is known as Hooke’s Law
- Increasing the load by a certain factor will also increase the displacement by a factor that rises linearly
Swing arm static analysis example:
Motorbikes need a swing arm or swing arm to connect the rear wheel to the frame. Static loading is important in planning the main motorbike so that it can run safely. Swing Arm is the main structural part of a motorcycle chassis that serves to hold the rear wheels for driving and as a shock breaker support. The swing-arm is free to follow the road contours and vehicle loads as long as the motorbike moves. The aim of this walkthrough is to show you how to set up a static analysis in OnScale solve if you wish to follow along with this example download the attached STEP file here – swing_arm_2.step!
Once you have logged in to OnScale Solve and created a new project let’s start by importing the geometry..
Click on the paperclip from the toolbar to import a 3D CAD file. Locate the swing_arm_2.step and begin the import process. After the import process is complete you will be prompted to select a length unit leave as the default (m).
The modeler will no longer be empty, it will show the geometry and the materials assigned to the model.
Let’s assign structural steel to the model, click BRAS OSCILLANT MOTO2, the material panel will now be displayed in the UI. From the dropdown menu select Structural Steel.
Moving to the Physics section of the UI we will now look to apply the fixed and force boundary conditions (BCs) to the model.
First move back to the Modeler and expand BRAS OSCILLANT MOTO2 to view the list of faces, click Face 340. Next moving back to Physics, click on the spanner from the toolbar and select Force Load apply a force of 2900N. Repeat these steps and assign another force load of equal magnitude to the Face 191.
Click spanner from the toolbar and select Restraint assign to Face 373 and Face 496.
Move to the Simulator section of the UI to begin the simulation process. The first step is to choose the mesh density. For this example we are going to choose a medium density mesh. Meshing is handled automatically in OnScale Solve and you can select from very coarse, coarse, medium, fine and very fine. Then click Mesh & Estimate and once complete click Run.
Once the simulation is complete click Load Results. In the results panel click Displacement, you will be able to select the key performance indicator (KPI) from a dropdown menu. With Displacement selected you can choose from Magnitude, X, Y or Z. Let’s view Y displacement:
That’s how to set up a very simple static analysis using OnScale Solve.
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