Composite materials typically fail due to the accumulation and release of stress during the cyclic loading process of external loads.Therefore,stress-strain monitoring plays a crucial role in the assessment of the lifespan and failure predic-tion of fiber-reinforced aluminum-based composite materials.However,it is challenging to visually characterize stress and strain in the deformation zone of composite materials.Using the fluorescence properties of rare earth ions for stress-strain detection is a feasible approach.The advantage of this method lies in the rich and sharp fluorescence spectra of rare earth ions,which are easy to observe and are highly sensitive to stress.In this study,Eu3+and Tb3+were selected as luminescent centers and incorporated into YAG-ZrO2 composite fibers,herein after referred to as(YAG:Eu3+/Tb3+-ZrO2)cf,these were combined with 2024 aluminum powder through hot pressing and sintering to create(YAG:Eu3+/Tb3+-ZrO2)cf-reinforced alu-minum-based composite materials.Dynamic tensile fluorescence sensing was used to characterize the luminescent proper-ties of(YAG:Eu3+/Tb3+-ZrO2)cf-reinforced aluminum-based composite materials under dynamic tensile conditions.Addi-tionally,the change in emission spectrum centroid wavelength with stress was investigated to study the luminescence sens-ing mechanism of internal stress.The results indicate that with increasing tensile stress,Eu3+displays a systematic red shift in the 5D0→7F1 transition,Tb3+exhibits a consistent blue shift in the 5D4→7F5 transition,while with Eu3+demonstrating higher sensing accuracy.This study provides insights into the development of stress sensor materials based on Eu3+and Tb3+.
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