In this video, the presenter discusses the influence of mesh size on finite element analysis results, particularly focusing on deformations and stress distributions. The key points covered include:
Default Mesh:
Default mesh contains about 18,000 nodes and 10,000 elements.
Deformation is approximately 567 microns, and stress is around 243 megapascals.
The model has bonded connections for all parts and linear material behavior.
Mesh Size Variations:
Mesh sizes of 20mm, 15mm, 10mm, 5mm, and 2mm are tested.
Larger mesh sizes result in fewer nodes and elements, while smaller sizes increase their number.
Effect on Deformation:
Deformation behavior is consistent across different mesh sizes.
A 10% difference in maximum deformation is observed between the coarsest and finest meshes.
Effect on Stress Distribution:
Stress distribution varies significantly with mesh size.
Smaller mesh sizes provide a more detailed stress distribution.
The presenter emphasizes the importance of using a consistent scale when comparing stress distributions.
Discussion on Hotspot Stresses:
Hotspot stresses, particularly in regions with sharp corners, may exhibit infinite values theoretically.
Changing mesh size affects the stress distribution around hotspots, and the presenter advises focusing on the non-infinite stress regions for analysis.
Mesh Size Influence:
The presenter discusses the influence of mesh size on hotspot stresses, indicating that smaller mesh sizes may sometimes result in lower stresses.
He highlights the importance of checking stress distribution in areas adjacent to hotspots rather than directly on the hotspot.
General Approach:
Checking stress distribution in non-hotspot areas helps evaluate the adequacy of the mesh for the intended analysis.
A 5-10% difference in results is considered acceptable for many engineering calculations.
Conclusion:
The video concludes with a general approach to analyzing mesh size influence, emphasizing the need to check stress distribution in relevant regions for the specific engineering task.
Key Takeaways:
Mesh size significantly influences stress distribution.
Consistent deformation behavior is observed across different mesh sizes.
Stress distribution around hotspots is influenced by mesh size.
Smaller mesh sizes provide more detailed stress information.
Focus on stress distribution in non-hotspot regions for analysis.
Conclusion: The video provides valuable insights into the impact of mesh size on finite element analysis results, particularly emphasizing the variation in stress distribution. The presenter's discussion on hotspot stresses and the importance of choosing an appropriate mesh size based on the engineering task adds practical considerations to the analysis process. Engineers and analysts can benefit from understanding how mesh size choices can influence the accuracy of simulation results.