Hot Isostatic Press Simulation in ANSYS Mechanical
Hi everyone, this is Mingyao from Ozen Engineering, Inc. In this video, I'll be demonstrating how we set up a hot isostatic press simulation. This simulation showcases the ability to simulate the process of hot isostatic pressing in a coupled thermal-structural analysis. It offers some unique capabilities, and I'll guide you through the workflow.
Software and Model Setup
We are using the current version of ANSYS, which supports full coupled field transient simulations—an essential feature for hot isostatic press analysis. Let's begin by loading the geometry:
- Load the geometry file.
- Set up the simulation with a quarter symmetric model, representing a full cylinder.
- The model consists of steel powder encased in a steel casing.
Material Properties
For the materials:
- The powder is 316 annealed steel, pulled from ANSYS's material library.
- The casing uses regular 304 steel, possibly half-hard.
- Both materials have multilinear plasticity models, temperature-dependent thermal expansion coefficients, and fatigue curves.
Meshing and Field Analysis
We'll use a coarse mesh to demonstrate the concept:
- Mesh options include hex or tet mesh, with resolution set to 6.
- Field analysis includes structural and thermal activation for both bodies.
Plasticity and Porosity Model
For the powder's plasticity and porosity:
- Use the Gerson model for plasticity and porosity.
- Specify a yield of 8.75e8 and an initial porosity of 30%.
- Additional parameters like the Tvergaard-Needleman parameters can be optimized based on test data.
Simulation Setup
Configure the simulation as follows:
- Set the simulation duration to 27,720 seconds, divided into 100 sub-steps.
- Enable Large Deflection for buckling analysis.
- Set symmetry boundary conditions and fixed supports.
- Apply temperature and pressure profiles using convection functions and pressure inputs.
Running the Simulation
Once the setup is complete:
- Run the analysis and monitor the force convergence curve.
- Observe the temperature and pressure changes over time.
- Analyze the results, including thermal strain and couple field information.
Conclusion
This demonstration highlights the ability to perform coupled thermostructural simulations with porous plastic simulations like the Gerson model in ANSYS Workbench. The main challenge is acquiring the correct material properties for the simulation. For more information on the Gerson model, refer to the ANSYS help or training manual.
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Hi everyone, this is Mingyao from Ozen Engineering. In this video I'll be demonstrating how we set up a hot isostatic press simulation. This simulation shows you the ability to simulate the process of doing hot isostatic press in a coupled thermal structural analysis.
This has some pretty nice and unique capabilities in this regard so I'm going to walk you through the workflow. One of the things I'm using, the current version of ANSYS has the ability to do full coupled field transient simulations.
This is very much a requirement for doing a hot isostatic press analysis. I'm going to start by loading up the geometry. Let's go ahead and find my file here. And this is my geometry. And then let's go ahead and set up the simulation. Here is the model we're going to use.
It's a quarter symmetric model. So this is a full cylinder. We have a powder on the inside and we have the casing on the outside. So this is the powder encased in a steel case here. We're going to heat the powder, apply pressure to form it into the right shape.
The powder will use the 316 annealed steel material, and the casing will use 304 steel. Both materials have multi-linear plasticity models, temperature dependent thermal expansion coefficients, and fatigue curves. I'll use a hex mesh for this model.
The sizing is fairly coarse, but we can change the resolution to 6 for a finer mesh. We have structural and thermal field analyses for both bodies. We can also do acoustic or electric simulations if needed.
For the powder, we'll implement the porous properties using the Gerson model in our plasticity model. This requires specifying a yield stress, initial porosity, and Tivogard parameters. Now let's set up the simulation.
We'll insert initial conditions, with a simulation time of 27,720 seconds broken up into 100 time steps. We'll apply a temperature profile on the surface, and a pressure profile on the selected surfaces. We'll heat up to a thousand degrees, hold at a high temperature, and then cool down.
The pressure will be applied during the holding phase. The material for our Gerson model has additional properties for void-based coalescence or nucleation control. However, this requires additional testing and data that I don't have, so I'll ignore it for now.
Let's run the analysis and keep an eye on the force convergence curve. We want to see the temperature shoot through and observe the size of the pores. After the analysis, we can see the temperature plot and observe the difference between the outside and inside at different temperatures.
The worksheet generates a full set of results, including thermal strain, temperature, and forces. If you're interested in more information about the Gerson model, check out the ANSYS help.
The goal of this demonstration is to show the ability to do a coupled thermostructural simulation with a porous plastic simulation like the Gerson model. Hopefully this was helpful for you. If you like this video, please give it a like and subscribe to our YouTube channel.
Otherwise, have a great day. Thank you.
