| Autor: |
P. V. D. P. L. Saparamadu, P. A. K. Karunananda, I. M. U. I. Wijayarathna, T. M. Pallewatta, M. A. V. S. G. Meegalla |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Lecture Notes in Civil Engineering ISBN: 9789811644115 |
| Popis: |
One of the main difficulties in stress/strain based fatigue damage estimation is to find a representative ‘damage indicator’ which can be easily connected with the stress/strain life curve (S–N curve). The mostly used damage indicator model is the Miner’s rule but it does not take into account the loading sequence effect. The experimental results are higher than the Miner expectations for increasing type loading and are lower than the Miner’s expectations for decreasing type of loading. Recently, a new damage indicator that is based on sequential law has been proposed to capture the load sequence effect more precisely. According to the fundamentals of the stress/strain based approach, the damage point travelling path (damage trajectory) travels along the stress/strain life curve. The obtained results of the sequential law can be further improved if the path of the actual damage trajectory is taken into consideration. This paper proposes a new damage indicator considering the movement of damage trajectory along the stress/strain life curve. Damage indicator values are obtained using MATLAB (2018a) code and confirmed the applicability of the developed new model using a numerical example. Numerical example was selected to capture the effect of multiaxial stress effect and curves based on experimental results and mathematical modes. Increasing and decreasing type loadings were applied. As shown in the numerical results, the obtained results illustrate the real trend of fatigue damage assessment. Therefore, more accurate fatigue life estimation can be predicted using newly proposed curve based fatigue damage accumulation model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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