| Autor: |
A.N. Savkin, D. S. Denisevich, A.A. Sedov, K. A. Badikov |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Procedia Structural Integrity. 14:684-687 |
| ISSN: |
2452-3216 |
| DOI: |
10.1016/j.prostr.2019.05.085 |
| Popis: |
Near threshold fatigue crack response is extremely sensitive to load history. It is associated with the influence of near-tip stress on instantaneous resistance of crack tip surface layers to failure under atmospheric conditions. The paper deals with computational aspects of stress and strain distributions at the crack tip. A new approach is proposed to obtain near-tip stress under variable amplitude loading. The method considers a combination of standard rules for determining local strains (Linear rule, Neuber rule, ESED method, etc.) and well-known in Finite Element Analysis (FEA) return mapping algorithm in context of nonlinear mixed hardening material model. Iterative procedure based on Newton-Raphson method is proposed to calculate plastic variables and near-tip stress at each load step. The calculated results obtained by new model are validated with the traditional approach in case of Al2024-T3 alloy for constant amplitude loading after tensile/comprehensive overloads. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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