Non-contact measurements of residual stress distribution and grain size in titanium alloys with laser ultrasonic system

Sampath, Santhakumar; Zhang, Zheng; Tham, Zi Wen; Chen, Yi Fan; Seng, Debbie Hwee Leng; Gantala, Thulsiram; Zhang, Lei

doi:10.1016/j.ijmecsci.2023.108809

Cited by 13 publications

(1 citation statement)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The research of He et al [23] indicated that ultrasonic surface waves propagating in the direction of the principal stress are most reasonable for assessing the residual principal stress in 45# steel, and that there is a significant negative correlation between the peak amplitude of the ultrasonic wave and the stress. Santhakumar et al [24] proposed a theoretical calculation model for the distribution of residual stress based on the laser ultrasonic detection method, achieving accurate detection of the residual stress distribution in titanium alloys. These studies have shown the great potential of laser ultrasonic detection technology in stress measurement.…”

Section: Introductionmentioning

confidence: 99%

Research on the Method of Absolute Stress Measurement for Steel Structures via Laser Ultrasonic

Tian,

Kong,

Liu

et al. 2024

Buildings

View full text Add to dashboard Cite

Accurate measurement of the stress in steel structures is crucial for structural health monitoring. To achieve this goal, a novel technique, the laser ultrasonic technique, was used in absolute stress measurement in this study. The feasibility of this technique has been verified through theoretical analysis and finite element (FE) analysis. A stress measurement experiment in steel specimens was conducted and the relationship between ultrasonic relative wave velocity and stress was explored. The results revealed that there is a similar linear correlation between the ultrasonic relative wave velocity and absolute stress. The stress can be obtained based on ultrasonic relative wave velocity. According to the stress measurement results, it was found that the absolute error between the measured stress and theoretical stress was largest when the stress level was low, and that the measured error of stress gradually decreased with increases in the applied stress. The relative error between the measured stress and the theoretical stress was within 10% when the stress was higher than 100 MPa. This further verifies the reliability of the laser ultrasonic technique under high-stress conditions. Additionally, the impact of temperature and surface roughness on stress measurement was analyzed. The stress error in stress measurement increased similarly linearly with the increase in temperature and increased non-linearly with the increase in roughness. The corresponding compensation methods were proposed to effectively improve the accuracy of measurement.

show abstract

Section: Introductionmentioning

confidence: 99%