Three approaches to evaluate of the heat dissipated during fatigue crack propagation experiments

Frattura ed Integrità Strutturale

Alena Vedernikova¹  Aleksey Vshivkov²  Anastasiia Iziumova²  Oleg Plekhov² 

[1] Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science;National Technical University of Athens;

关键词: ir-thermography;    lock-in thermography;    heat flux sensor;    dissipated energy;    fatigue crack propagation;   

DOI  :  10.3221/IGF-ESIS.51.01

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown