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Alena Vedernikova https://orcid.org/0000-0003-1069-7887 Anastasiia Iziumova https://orcid.org/0000-0002-1769-9175 Aleksey Vshivkov https://orcid.org/0000-0002-7667-455X Oleg Plekhov

Abstract

This work is devoted to the comparative analysis of three techniques for measurement of energy dissipation in metals under fatigue crack propagation: original contact heat flux sensor, post-processing of the infrared thermography data and lock-in thermography. The contact heat flux sensor allows real-time recording of the heat source value. Non-contact temperature measurements by infrared thermography techniques allows one to calculate the heat source field on the specimen surface using the solution of heat conductivity equation. Lock-in thermography is a well-established technique for measuring of the dissipated energy under cyclic loading based on the analysis of the second harmonic amplitude of the thermal signal. This paper deals with the V-notched flat specimens made of stainless steel AISE 304 subjected to cyclic loading. It was shown that the dissipated energy values estimated by different techniques have a good qualitative agreement. Contact and non-contact measurements can be used for investigation on energy dissipation either in combination or separately. The measured values allows one to propose a relation between the fatigue crack growth rate and dissipated heat near the crack tip.

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    Section
    SI: IGF25 – International Conference 2019

    How to Cite

    Vedernikova, A., Iziumova, A., Vshivkov, A., & Plekhov, O. (2019). Three approaches to evaluate of the heat dissipated during fatigue crack propagation experiments. Frattura Ed Integrità Strutturale, 14(51), 1–8. https://doi.org/10.3221/IGF-ESIS.51.01

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