Fatigue analysis for the aluminum alloy 7050-T7451 performed by a two scale continuum damage mechanics model

Araújo, L.M.; Ferreira, Guilherme Viana; Neves, R.S.; Malcher, L.

doi:10.1016/j.tafmec.2019.102439

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…Researchers [26,27] have suggested that S N f g is a material constant that can provide a threshold to monitor fatigue damage of material. However, the influence of load ratio (R load ) on entropy generation under cyclic loading was neglected in these previous works.…”

Section: Entropy Generation Accumulationmentioning

confidence: 99%

“…where fi+1, σi, Xi and Ri are the yield function, stress, back stress and drag stress at ti, re- Entropy 2024, 26,391 To validate the reliability of this program, the test data of GH4169 at 650 • C [43] were utilized for comparison with the simulation results. All the test data were collected from strain-controlled uniaxial tests with a specific strain rate (dε/dt =0.0001 s −1 ) and load ratio (R load = −1), and the comparisons are shown in Figure 5.…”

Section: Cyclic Viscoplasticity Numerical Algorithmmentioning

confidence: 99%

“…CDM life prediction models stem from the non-linear fatigue damage accumulation theory proposed by Lemaitre and Chaboche [8]. Subsequently, the CDM-based model was combined with micro-macro variety [26], XFEM technology [27], and the critical plane method [28], etc., to analyze different fatigue issues. Nevertheless, in recent research, many scientists believed these approaches are largely empirical in nature and fail to unveil the physical nature of the fatigue process, such as the mechanism of damage evolution and accumulation [29].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Entropy-Based Fatigue Life Assessment Method for Nickel-Based Superalloy GH4169 at Elevated Temperature Considering Cyclic Viscoplasticity

Ding,

Xia,

et al. 2024

Entropy

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This paper develops a thermodynamic entropy-based life prediction model to estimate the low-cycle fatigue (LCF) life of the nickel-based superalloy GH4169 at elevated temperature (650 °C). The gauge section of the specimen was chosen as the thermodynamic system for modeling entropy generation within the framework of the Chaboche viscoplasticity constitutive theory. Furthermore, an explicitly numerical integration algorithm was compiled to calculate the cyclic stress–strain responses and thermodynamic entropy generation for establishing the framework for fatigue life assessment. A thermodynamic entropy-based life prediction model is proposed with a damage parameter based on entropy generation considering the influence of loading ratio. Fatigue lives for GH4169 at 650 °C under various loading conditions were estimated utilizing the proposed model, and the results showed good consistency with the experimental results. Finally, compared to the existing classical models, such as Manson–Coffin, Ostergren, Walker strain, and SWT, the thermodynamic entropy-based life prediction model provided significantly better life prediction results.

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Section: Entropy Generation Accumulationmentioning

confidence: 99%

Section: Cyclic Viscoplasticity Numerical Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Entropy-Based Fatigue Life Assessment Method for Nickel-Based Superalloy GH4169 at Elevated Temperature Considering Cyclic Viscoplasticity

Ding,

Xia,

et al. 2024

Entropy

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“…Using the function proposed, the authors were able to improve the predictions for both notched and pure shear specimens, for SAE 1045 steel and AA2024-T351 alloy. Besides that, Lopes andMalcher (2017), andAra ujo et al (2020) applied the proposition in cyclic problems and fatigue life estimate for 304 and S460N steels, AA6061-T6 and AA7050-T7451.…”

Section: New Approach For the Denominator Of Damage Functionmentioning

confidence: 99%

An improved continuous damage model to estimate multiaxial fatigue life under strain control problems

Ferreira

Campos

Neves

et al. 2022

International Journal of Damage Mechanics

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In this contribution, a modification and application of the Lemaitre damage evolution law is proposed for the problem of fatigue life estimate under low number of cycles. For this, the denominator of damage, considered constant for Lemaitre, was replaced by a function dependent on the stress triaxiality. The new function has a nonlinear and thermodynamically consistent behavior. In addition, the evolution law of the backstress tensor is adopted as proposed by Desmorat, where there is no saturation of the limit value. The formulation is implemented in an academic tool for analysis at one Gauss point, through an implicit integration strategy of the flow equations. The Newton-Raphson method is used to solve a system of nonlinear equations, with two tensor and two scalar equations. Thus, in order to demonstrate the robustness of the model, experimental data from the literature for SAE 1045 and S460N steels are adopted. Proportional and nonproportional axial, torsional and multiaxial loading paths are simulated. Finally, the results have shown that the modification formulation is a good strategy to control the damage evolution in predicting fatigue life. In this sense, the calculated lives by the new proposal are within a scatter band of factor three, both under normal or torsional uniaxial loading conditions, as well as proportional or nonproportional multiaxial conditions.

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“…However, this model can only be used for the calculation and prediction of damage defects in the cold forming process of metal materials. Because this model does not affect the crack initiation and propagation process of temperature and strain rate during the high-temperature forming process, it cannot be used for the calculation and prediction of damage defects in the high-temperature forming process; On the other hand, this damage model lacks consideration of the effect of temperature-induced elastic modulus changes on material damage [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Lemaitre Model and Fracture Map for Cr5 Alloy Steel during High-Temperature Forming Process

et al. 2022

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To effectively control and predict crack defects in the high-temperature forming process of Cr5 alloy steel, based on the traditional Lemaitre damage model, a new high-temperature damage model of Cr5 alloy steel was proposed which considered the change of material elastic modulus with temperature, the influence of material hydrostatic pressure as well as temperature and strain rate on material damage. Because Cr5 alloy steels are usually forged at high temperatures, tensile testing is an important method to study the damage behaviour of materials. Through the high-temperature tensile test and elastic modulus measurement test of the Cr5 alloy steel, the stress–strain curves and the relationship curves of the elastic modulus value with the temperature of Cr5 alloy steel under different temperatures and strain rates were obtained. A new high-temperature damage model of Cr5 alloy steel was built by introducing the Zener–Hollomon coefficient considering the influence of temperature and strain rate. The established high-temperature damage model was embedded in Forge® finite element software through the program’s secondary development method to numerically simulate the experimental process of Cr5 alloy steel. Comparing the difference between the displacement–load curves of the numerical simulation and the actual test of the tensile process of the experimental samples, the correlation coefficient R2 is 0.987 and the difference between the experimental value and the simulated value of the tensile sample elongation at break is 1.28%. The accuracy of the high-temperature damage model of Cr5 alloy steel established in this paper was verified. Finally, the high-temperature damage map of Cr5 alloy steel was constructed to analyse the variation law of various damage parameters with the temperature and strain rate of the high-temperature damage model of Cr5 alloy steel.

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Fatigue analysis for the aluminum alloy 7050-T7451 performed by a two scale continuum damage mechanics model

Cited by 16 publications

References 28 publications

Thermodynamic Entropy-Based Fatigue Life Assessment Method for Nickel-Based Superalloy GH4169 at Elevated Temperature Considering Cyclic Viscoplasticity

Thermodynamic Entropy-Based Fatigue Life Assessment Method for Nickel-Based Superalloy GH4169 at Elevated Temperature Considering Cyclic Viscoplasticity

An improved continuous damage model to estimate multiaxial fatigue life under strain control problems

An Enhanced Lemaitre Model and Fracture Map for Cr5 Alloy Steel during High-Temperature Forming Process

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