Simulation of Stress Concentrations in Notches
2. FEM Simulation of the Stress Concentration in a Notch
- The values of the stresses at the nodal points and the stresses in the elements were compared.
- The uses of linear and quadratic elements were compared.
- The principal stresses were selected for comparison with the analytical solution (non-equivalent von Mises stresses).
2.1. Simulations of Notch Effects in Plane Problems
2.2. Simulations of Notch Effects in 3D Tasks
3. Practical Applications
- To assess the stress state at the root of the notch, it is necessary to know the components of the principal stresses; in addition, this is also a necessary input in the case of the multiaxial approach to fatigue life and strength estimation.
- The significant difference in the evaluation of the principal stress values lies in the elements and at the nodal points.
- Significantly better agreement of stresses can be achieved at nodal points compared with stresses in elements at the same element network density.
- Non-significant difference was found between stress values in quadratic and linear elements in both 2D and 3D models.
- For objectively defined accuracy of fatigue life calculation (±25%), it is necessary to choose the mesh density at the critical location, such that the ratio of element length to notch root radius is 1/5 to 1/4.
- The proposed methodology, applied to simulate the stress concentration at the weld root of a gas pipe, is in good agreement with published experimental results, and may help to determine possible fatigue life extension by deburring the weld geometry with a grinder.
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
|FEM||finite element method|
|FBG||fiber Bragg gratting|
|ESPI||electronic speckle pattern interferometry|
|DIC||digital image correlation method|
|IIW||International Institute of Welding|
|Kσ||stress concentration factor|
|σmax||maximum stress in the notch|
|σref||the value of the maximum stress in the notch obtained by the analytical solution|
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Chmelko, V.; Harakaľ, M.; Žlábek, P.; Margetin, M.; Ďurka, R. Simulation of Stress Concentrations in Notches. Metals 2022, 12, 43. https://doi.org/10.3390/met12010043
Chmelko V, Harakaľ M, Žlábek P, Margetin M, Ďurka R. Simulation of Stress Concentrations in Notches. Metals. 2022; 12(1):43. https://doi.org/10.3390/met12010043Chicago/Turabian Style
Chmelko, Vladimír, Michal Harakaľ, Pavel Žlábek, Matúš Margetin, and Róbert Ďurka. 2022. "Simulation of Stress Concentrations in Notches" Metals 12, no. 1: 43. https://doi.org/10.3390/met12010043