What is localized stress?
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What is localized stress?
Stress concentration is defined as – Localized stress considerably higher than average (even in uniformly loaded cross sections of uniform thickness) due to abrupt changes in geometry or localized loading. Stress concentration is often called “stress raisers” or “stress risers”
What do u mean by stress concentration & How will you mesh for such regions?
A stress concentration is a place of the mesh where the stress raises above the applied nominal stress. It behaves in a similar fashion than stress singularities, but the stress will converge towards a finite value, not infinite, given that the mesh is sufficiently refined.
How do singularities deal with stress?
To simple the scheme there three approaches to deal with stress singularities:
- Ignoring the singularity (I myself do not prefer this one!)
- Resolving the singularity by adding features (like fillets, areas for applying forces, sub-modeling, etc.)
- Using non-linear material model.
What causes stress singularity in FEA?
Singularity refers to the location where stress value is unbounded in a finite element model. It is caused by a point or line load or moment, an isolated constraint point where the reaction force acts as a point load, or shape corner.
What is meant by stress concentration?
A stress concentration, also known as a stress riser/raiser, is a point in a part where the stress is significantly greater than its surrounding area. Stress concentrations occur as a result of irregularities in the geometry or within the material of a component structure that cause an interruption of the stress flow.
What is meant by stress concentration How do you take it into consideration in case of a component subjected to dynamic loading?
Stress concentration occurs at the junction of two different diameters or around discontinuities like holes At these places the stress value increases more than the average values. It is more pronounced in dynamic loading.
How do you get rid of stress singularity?
Common solutions
- Ignore the singularity: The “big” one. There is some merit to it.
- Add an area: This is a reasonable choice but you can’t apply it all the time.
- Model a fillet: I really dislike this.
- Make a smaller separate model: This makes sense in some cases.
- Use nonlinear material: This is actually a great option.
How do I get rid of singularities?
To minimize singularities, consider the following: Use distributed loads and constraints whenever possible to avoid singular stress or displacement concentrations that could distort your results. Use the Total Load At Point option to distribute a point load over a surface or curve in a statically equivalent manner.
How does FEA deal with stress singularity?
What are the different types of errors in FEA?
In general, we can decompose errors in FEA—finite element analysis—in three main groups:
- Modeling errors due to simplifications (“We try to model the real world yet are not able to do it 100\%.”)
- Discretization errors that arise from the creation of the mesh.
- Numerical errors of the solution of the FEA equations.
What are the differences between the stress intensity factor KI and the plane strain fracture toughness KIC?
The stress intensity, KI, represents the level of “stress” at the tip of the crack. The fracture toughness, KIC, is the highest value of stress intensity that a material under very specific (plane-strain) conditions can withstand without fracture.
What is the difference between point load singularity and edge singularity?
A single point load leads to stress singularities whereas an edge pressure results in a uniform stress field. As you can see, far away from the point load singularity the stress field is uniform despite of the local singularity.
What happens when you rerun the stress hot spot diagnostics tool?
When you rerun the stress hot spot diagnostics tool, the areas of stress concentrations should be filtered out if the mesh is fine enough, and the remaining stress hot spots would point to stress singularities.
What are singularities in FEA?
Singularities are inherent in all FEA calculations due to the inability to mathematically calculate stress at locations such as sharp corners, point loads, or fixed boundary conditions. Mathematically the stress at these locations is infinite however due to errors in meshing and calculations,…
Is the maximum stress concentration the same as the singularity?
Not necessarily. You need to identify if the maximum stress is a real stress concentration or if it is a numerical singularity. What is a singularity? Singularities are not a SOLIDWORKS Simulation specific problem, but a general one introduced by using Finite Element Analysis (FEA).