Prediction of metal fatigue life based on the infrared thermographic technique and the intrinsic damage dissipation
WU Yalian
YE Zihe
QIAN Miao
LI Haoran
LI Wenqi
Abstract：[Objective]Aiming at the problems of long cycle,high cost of traditional group method for testing metal fatigue S-N curves and insufficient targeting of existing infrared thermographic correlation models,a fatigue life prediction method based on intrinsic damage dissipation was proposed to achieve rapid and accurate determination of S-N curves.[Methods]Firstly,an intrinsic damage dissipation characterization model was derived based on continuum damage mechanics and irreversible thermodynamics.Secondly,a fatigue life prediction model was constructed by combining the correlation assumption between temperature rise and fatigue damage.Finally,infrared thermographic tests were conducted with aluminum alloy 2A12 as the research object,and the predicted S-N curves were compared with the results of the group method for verification.[Results]This method only required a single sample to complete the test,and the obtained S-N curves are highly consistent with those of the group method,which verified the effectiveness of the model.It significantly reduced the test cost and cycle,providing an efficient scheme for the determination of metal fatigue S-N curves.
Keywords：Metal fatigueS-N curveLife predictionInfrared thermographic techniqueIntrinsic damage dissipation
Publication Date：2026-01-31
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 42-47 )