Finite Element Analysis of Metals Fatigue Damage Based on Thermodynamic Entropy models

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ASNAASHARI F.; Dibajian S.H.; MAHMOUDI M.J.

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Journal: Modares Mechanical Engineering Year:2020 | Volume:20 | Issue:5 Page(s): 1361-1373

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Title

Finite Element Analysis of Metals Fatigue Damage Based on Thermodynamic Entropy models

Author(s)

ASNAASHARI F. | Dibajian S.H. | MAHMOUDI M.J. | Issue Writer Certificate

Keywords

Fatigue DamageQ1

Dissipated EnergyQ1

ThermographyQ1

Numerical SimulationQ2

Abstract

The amount of entropy generation during the fatigue loading is treated as an indicator of the damage accumulation in the material. The net entropy production rate of the system can be computed using the Thermography technique and recognizing the temperature field distribution at a specimen surface under cyclic loading by the infrared camera and calculating the Dissipated Energy and considering the possibility of the specimen heat transfer with the environment. It is expected that using the appropriate tool, this method can be used as a non-destructive inspection method concerning the fatigue-induced damage of materials. This research has been conducted to feasibility study and applicability of the methodology through numerical modeling and analysis. In this paper, using the finite element numerical method and in the framework of Abaqus software, simulations of fully reversed bending are carried out on the standard specimens of aluminum (Al6061-T6) whose experimental test results are available in the literature. Based on the results of the mechanical and thermal analysis, calculating the entropy production rate, fatigue fracture entropy, damage variable and remaining life assessment based on this variable are performed. The results obtained from the Numerical Simulation are compared and validated with the results of experimental tests. Also, a numerical analysis is carried out to estimate the temperature enhancement and fatigue selfheating phenomenon due to the cyclic loading based on the strain-life curve characteristics and Dissipated Energy on the axial specimen made of (AISI 4340). The results obtained from the research indicate that the infrared Thermography technique as a non-destructive evaluation method in the low cycle fatigue range is a suitable tool for the temperature field evaluation and subsequently, the accumulated damage estimation in the material.

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APA: Copy

ASNAASHARI, F., Dibajian, S.H., & MAHMOUDI, M.J.. (2020). Finite Element Analysis of Metals Fatigue Damage Based on Thermodynamic Entropy models. MODARES MECHANICAL ENGINEERING, 20(5 ), 1361-1373. SID. https://sid.ir/paper/178533/en

Vancouver: Copy

ASNAASHARI F., Dibajian S.H., MAHMOUDI M.J.. Finite Element Analysis of Metals Fatigue Damage Based on Thermodynamic Entropy models. MODARES MECHANICAL ENGINEERING[Internet]. 2020;20(5 ):1361-1373. Available from: https://sid.ir/paper/178533/en

IEEE: Copy

F. ASNAASHARI, S.H. Dibajian, and M.J. MAHMOUDI, “Finite Element Analysis of Metals Fatigue Damage Based on Thermodynamic Entropy models,” MODARES MECHANICAL ENGINEERING, vol. 20, no. 5 , pp. 1361–1373, 2020, [Online]. Available: https://sid.ir/paper/178533/en

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