Abstract
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.
Highlights
The experimental data cycles to fracture of alloys, a detailed analysis of the experimental data on alloy for alloy D16ChATW obtained at three intensities of introducing impulse energy under a dynamic non-equilibrium processes (DNP) at εimp = 3.7%, 5.4% and 7.7% cover the entire range of maximum cycle stresses under the cyclic deformation studied [13]
Noteworthy is that earlier predictions of fatigue life of aluminum alloys practically disregarded the fact that, in the process of cyclic loading, the structural material may be subjected to additional impulse loads of different intensity
HV and limiting scatter of alloy hardness m in the process of cyclic loading at fixed maximum cycle stresses, or their relative values me are the main model parameters
Summary
To adapt the proposed structural-mechanical model to estimating the effect of dynamic non-equilibrium caused by impact-oscillatory loading on the number of cycles to. To adapt theprocesses proposed structural-mechanical model to estimating the effect of dyfracture of alloys, a detailed analysis of the data on alloy on was namic non-equilibrium processes caused byexperimental impact-oscillatory loading the number of conducted, along with a number of additional studies on this alloy. The experimental data cycles to fracture of alloys, a detailed analysis of the experimental data on alloy for alloy D16ChATW obtained at three intensities of introducing impulse energy under a DNP at εimp = 3.7%, 5.4% and 7.7% cover the entire range of maximum cycle stresses under the cyclic deformation studied [13]. For alloy D16ChATW in the initial state, an almost linear dependence of the number of cycles to failure on the maximum cycle stress was obtained
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