Phenomenological Models and Peculiarities of Evaluating Fatigue Life of Aluminum Alloys Subjected to Dynamic Non-Equilibrium Processes

Physical-mechanical models for predicting the fatigue life of aluminum alloys D16ChATW and 2024-T351 are proposed and tested. Damage accumulation patterns are established for these alloys in the initial state and after dynamic non-equilibrium processes (DNP) of different intensity that occur at maxi...

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Bibliographic Details
Published in:Metals (Basel ) 2021-10, Vol.11 (10), p.1625
Main Authors: Chausov, Mykola, Pylypenko, Andrii, Maruschak, Pavlo, Menou, Abdellah
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
aviation aluminum alloys
Cyclic loads
Damage accumulation
Damage patterns
Deformation
dynamic non-equilibrium processes (DNP)
Equilibrium
Fatigue life
Fatigue tests
forecasting fatigue life
Hardness
Load
Mathematical models
Mechanical properties
Metal fatigue
Methods
Parameters
Stresses
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Summary:Physical-mechanical models for predicting the fatigue life of aluminum alloys D16ChATW and 2024-T351 are proposed and tested. Damage accumulation patterns are established for these alloys in the initial state and after dynamic non-equilibrium processes (DNP) of different intensity that occur at maximum cycle stresses σmax from 340 to 440 MPa, cycle asymmetry coefficients R = 0.1 and load frequency f = 110 Hz. The main model parameters are the initial alloy hardness HV and the limiting parameters of scatter of hardness values m. These parameters are evaluated in the process of cyclic loading with fixed maximum stresses of the cycles. Relative values me are also considered. For the alloys in the initial state, the proposed models are shown to be in good agreement with the experimental results. Conversely, structural changes taking place in alloys after DNP complicate the prediction of their fatigue life.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11101625