# Learning Center

Course:

Introduction to Electro-Thermal-Mechanical Modeling

## Getting Started with Electro-Thermal-Mechanical Modeling

This 5-part, self-paced course is an introduction to the workflow in the software and to modeling Joule heating and thermal expansion in COMSOL Multiphysics®. Through comprehensive, step-by-step demonstrations in the COMSOL® software, you will learn how to effectively perform electro-thermo-mechanical analyses. You will also obtain a thorough overview of how to use the software in general. Model files are included in each part of the course, so you can follow along on your own time. Thus, this course is useful for anyone who is just getting started in the software and learning how to use it. The example model built and used during the course simulates the heating of an array of bond wires connecting a chip to a circuit board. The heating leads to thermal expansion and thermally induced stresses. An overview of the topics covered throughout the course are as follows:

Chip with bond wire array, single bond wire, and bond wire model geometry. A chip with an array of bond wires (left) of which we break out and study a single bond wire (center) and then use it for the model geometry (right) as we conduct analyses through the course.

##### Part 1: Electro-Thermal Mechanical Workflow and CAD Import
• Getting started with the user interface
• Setting up your first physics
• Simplifying the geometry via virtual operations
• Examining the results
##### Part 2: Performing a Mesh Refinement Study and Using Selections and Variables
• Extracting numerical results via integration
• Verifying the results via mesh refinement
• Adding and coupling another physics into the model
• Using selections to simplify the model setup
##### Part 3: Evaluating Results and Introducing Nonlinearities in a Current-Driven Model
• Setting up a current-driven problem
• Using a built-in material nonlinearity
##### Part 4: Using the Solver Algorithms and Addressing Modeling Issues
• Overview of the stationary solution approach
• Using the transient solver efficiently
• Computing the deformations
##### Part 5: Mesh Refinement, CAD Import, and Simulation Apps
• Verification of the mesh