A B S T R A C TIn the present work, evolution of damage under high-temperature (823 K) low cycle fatigue loading condition in near α IMI-834 titanium alloy has been studied. The in situ damage has been experimentally measured during cyclic deformation using the alternating current potential drop (ACPD) technique. The measured damage curve has been compared with the damage curves calculated through mechanical variables such as cyclic modulus and stress amplitude. The ACPD damage curve has been found most sensitive towards high-temperature low cycle fatigue damage evolution.
Acoustic emission -AEAcoustic Emission burst: A signal oscillatory in shape whose oscillations have a rapid increase in magnitude from an initial reference level (generally that of background noise) followed by a decrease (generally more gradual) to a value close to the initial level. Threshold: It is the user defined value of amplitude in decibels (dB), generally decided and set based on background noise. Counts: Number of times an AE burst crosses the threshold. Peak amplitude: It is the maximum voltage of the AE signal and is measured in decibels. Energy: It is the area under the amplitude-time curve above the threshold value. Rise time: It is the time between the first threshold crossing and maximum peak amplitude. Duration: It is the time between the first and the last threshold crossing.
The numerical estimation of evolving damage under low cycle fatigue loading condition has been performed in the near‐α titanium alloy IMI‐834 at 823 K temperature. By using the experimentally determined parameters as input, numerical simulation of fatigue damage has been performed on round specimens using finite element analysis. Coupled deformation‐damage model has been established for this alloy for simulation of damage evolution in a three‐dimensional cylindrical low cycle fatigue test specimen. The fatigue damage estimates from numerical simulation are observed to be in close agreement with the experimental results.
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