Open Source Mechanics
New videos every Saturday at 11 AM (GMT-3, Local Time)!
Here you'll learn how to simulate engineering processes!
I'm a mechanical engineer interested in sharing my knowledge on modelling of solid mechanics processes by different methods and software. I'm developing WeldForm SPH and FEM, CPU and GPU.
Subscribing to my channel, you will learn how to use commercial and open source simulation soft, and how it works. Finally, I will be sharing some C++, CUDA Python, Fortran, programming and scripting basics things.
The processes presented on this channel involve large mechanical strains, metal forming, welding, CFD and much more.
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Open Source Mechanics
WeldFormFEM News!
Both explicit & Implicit FEM solvers are gettin' bigger & robust!
Explicit FEM version now accept:
- Elasto Visco Plastic (Perzyna Style) plastic models, to work with Hollomon, Johnson Cook, Norton Hoff, GMT among others. This is a lot more stable than conventional plastic radial return with hardening like Simo & Huges style, wich is more suited for non rate dependent models.
- Rigid Visco Plastic Norton-Hoff style (WIP)
- The main focus is on remeshing, up until now was periodic, but now has a lot of new controls based on :
- distortions
- normalized jacobians
- bad count element percentage
which trigger both delta time reduction & remeshing.
Keep on track! Follow me!
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3 weeks ago | [YT] | 12
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Open Source Mechanics
First Implicit Velocity Based Quasi Static Solver is Working!
For Forging and slow processes, but working with Strain Rate Dependant materials!!!!
github.com/luchete80/WeldFormFEM
3 months ago | [YT] | 2
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Open Source Mechanics
20250528 - Forging Simulation!!! #FEM #Forging #Implicit #Static #TOP5
After a lot of research I have been studying the top 5 Commercial Simulation forging tools.
WHY COMERCIAL? Is because I wanted to know how forging is treated.
To my surprise, the TOP 5 tools use mostly implicit pseudo Static problems.
So, these are excellent news, considering times to solve explicit simulations could results larger,
together with the conditionally stable methods, remeshing decreasing even more simulation times.
So... Welcome to ForgeFormFEM!!!
The idea is to reuse all explicit and existing things like contact, hourglass, remeshing, and move them to an implicit pseudo static solver.
github.com/luchete80/ForgeFormFEM
I'm changin the method from explicit to implicit
So I will use Eigen and PETSC (yeah, PETSC, you read it right.
I'm trying to remembwer the implicit solving steps
1.Get Current Coordinates
2. Shape Function gradients dNdx
3. Build deformation gradient F
4. Almansi strain
5. Stress
6. B matrices (Geo & Material)
7. Internal Force Vector
8.Material K = BT D B
9. Geo K = BT Sigma B (I will post about these)
Wish me luck!
7 months ago (edited) | [YT] | 0
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Open Source Mechanics
Do you want to know how shell elements works??
I'm planning to create a course about this.
Check our simple testing element and its results in a transverse load patch test in comparison with ANSYS
181 element!
NICE!
8 months ago | [YT] | 6
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Open Source Mechanics
Suggested Adaptive Mesh refinement (w/Omega_h) and global remeshing (with MMG) technique:
9 months ago | [YT] | 1
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Open Source Mechanics
#FEM #TETRA #WeldForm #CUDA #GPU
Mores dvances in mesh adapting refinement using Omega_h!!!
Mapping of nodal variables is ready.
Also, now CPU version runs on Windows.
The first images shows only remeshing (w/o length parameters) if angle is between certain threshold. Now more control of quality is possible.
Also as in mmg library, we can map a variable to use as mesh size scale.
9 months ago | [YT] | 3
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Open Source Mechanics
We are studying some cones produced with incremental forming. It results some 90 degree separated zones with similar deformations, so in order to be not affected by mesh influence, now we can generate with gmsh a "cylindrical" mesh so all elements are subfected to symmetric bending!!
Check it out :
github.com/luchete80/radioss_tutorials/tree/develo…
9 months ago | [YT] | 1
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Open Source Mechanics
Several advances in mesh adapting refinement using Omega_h!!!
Using element angles and element length to refine!!!
Maybe will be also incorporated mmg to compare!
At left are the original mesh with its plastic strain and at right are the new meshes with their the metrics.
Next: to map to new mesh and continue process!
#FEM #OMEGA_H #opensource
9 months ago | [YT] | 4
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Open Source Mechanics
20250311 - WeldFormFEM: Adding Adaptive Mesh Remefinement!!!
#FEM #CUDA #GPU
Begining to Add Adaptive Remeshing for GPU and CPU with omega_h library!!!
I really like Omega_h new coding style approach.
Mesh is succesfully built from current nodes and connectivities.
So, the thing is now to choose between Refine and Adapt Methods, I will begin with adapt in order to study element quality.
10 months ago | [YT] | 4
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Open Source Mechanics
If you have subscribed to opensourcemech mail list in 2025, please do it again if you want to receive news about courses and material!! Link was broken so I have this year list empty!! Thank you!!!
opensourcemech.com/subscribe.html
10 months ago | [YT] | 4
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