Demonstration of Thermo-Mechanical Model Development — Lesson 5

This lesson covers the process of Thermo Mechanical Analysis using commercial software. It explains how to develop a model, integrate thermal and mechanical analysis, and create geometry for analysis. The lesson also discusses how to define temperature-dependent properties, initial conditions, and boundary conditions. It further elaborates on how to perform thermal analysis using a dynamic heat source model and predict thermal history. The lesson then moves on to mechanical analysis, explaining how to define temperature-dependent properties, initial conditions, and boundary conditions. It also covers how to perform Thermo Mechanical Analysis and predict stress distribution. The lesson concludes with a discussion on how to visualize results and create a certification for the given transcript.

Video Highlights

01:18 - Process of creating a geometry for analysis and the importance of domain in the analysis
05:00 - Importance of predicting residual stress and distortion in a welded structure
15:00 - Process of performing stress analysis using reduced integration scheme
27:22 - Importance of deciding the boundary condition in stress analysis

Key Takeaways

- Thermal analysis involves defining temperature-dependent properties, initial conditions, and boundary conditions. The governing equation for thermal analysis is usually the Fourier heat conduction equation.
- The output from the thermal analysis, which includes temperature distribution and stress distribution, is used as input for the stress analysis model or mechanical analysis model. The thermal history is applied as a load for the mechanical analysis.
- The results of the Thermo mechanical analysis can be visualized using the commercial software. This includes the distribution of stress, angular distribution, and normal distribution. The final results of interest are the residual stress and distortion in a welded structure.
- The mechanical analysis involves defining temperature-dependent properties, initial conditions, and boundary conditions. The Thermo mechanical analysis is then performed, with the thermal analysis serving as the input to the mechanical model.
- In welding processes, energy transfer occurs from the arc, causing momentum transport within the molten pool, this is influenced by surface tension force and can be altered by surface active elements