Stress Hot Spot
The Stress Hot Spot tool can be used to distinguish between stress singularities and stress concentrations. It works by determining locations were the von Mises stress changes drastically between neighboring elements; an indication of a stress singularities. On the other hand, if the stress between adjacent elements is correlated, it is more likely due to a stress concentration.
Once Stress Hot Spot is detected, the mesh can be refined further at the location of interested through the Detect Stress Singularities algorithm.
After your study has finished solving, right click on the Results folder and choose Stress Hot Spot Diagnostics.
It is used to filter the elements that participate in the stress hot spot diagnosis based on the magnitude of the equivalent strain relative to the maximum equivalent strain for each body. If use a higher sensitivity factor, it will includes more elements with high strains. It will also detect multiple stress hot spot areas on multiple bodies. For higher sensitivity factor, it will also need longer computational time . Click Run Stress Hot Spot Diagnosis after determine the Sensitivity Factor.
A dialog box will pop up if Stress Hot Spots are detected or not. Click Ok to review the results. The picture below mention that the Stress Hot Spots have been detected.
A stress plot is generated. The grey elements is the “Stress Singularities”. It has been excluded in this results plot. Furthermore, we can try to refine the mesh to verify the Stress Singularities in other mesh level.
After key in the Mesh Refinement Level and the element size and ratio. Then run stress singularity diagnosis to check the Stress Singularity in other mesh level. Besides that, there are two option, you can select the “Restore the study……” if need to remain original mesh settings. Otherwise, you may select the second options if need overwrite the existing mesh with final level settings.
After the diagnosis finished, is the stresses are diverging or converging. For diverging stresses, the stresses will increase or decrease when the mesh become finer (will become infinite). For converging stresses, the stresses will become stable and you will see it will not change anymore when reach certain element size. Click Ok to review the results.
The results only show the stress concentrations. It is the converged value and can be trusted.
You can also only observe the Stress Singularity area by clicking the Isolate Stress Singularity command.
For the stress hot spot , it always show near sharp geometric edges, and on corners on solid and shell bodies. The fillet can be applied on that area so avoid stress hot spot.