Fatigue Crack Growth Behavior of Eutectoid Steel Rail

Cen, Yaodong; Chen, Lin; Ji, Chunjiao; Wang, Huijun; Bao, Xirong

doi:10.1007/s11595-022-2558-3

Cited by 1 publication

(1 citation statement)

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“…Cylindrical components are widely used in various fields of industrial production, and the quality of cylindrical components directly determines the operating performance and service life of related equipment [ 1 , 2 ]. The internal defects of cylindrical components are prone to stress concentration under load, resulting in the expansion of defects and equipment damage [ 3 , 4 , 5 ]. Therefore, high-precision non-destructive testing methods for internal defects of cylindrical components are very important [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Research on Photoacoustic Synthetic Aperture Focusing Technology Imaging Method of Internal Defects in Cylindrical Components

Zhang,

Li,

Chen

et al. 2023

Sensors

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Cylindrical components are parts with curved surfaces, and their high-precision defect testing is of great significance to industrial production. This paper proposes a noncontact internal defect imaging method for cylindrical components, and an automatic photoacoustic testing platform is built. A synthetic aperture focusing technology in the polar coordinate system based on laser ultrasonic (LU-pSAFT) is established, and the relationship between the imaging quality and position of discrete points is analyzed. In order to verify the validity of this method, small holes of Φ0.5 mm in the aluminum alloy rod are tested. During the imaging process, since a variety of waveforms can be excited by the pulsed laser synchronously, the masked longitudinal waves reflected by small holes need to be filtered and windowed to achieve high-quality imaging. In addition, the influence of ultrasonic beam angle and signal array spacing on imaging quality is analyzed. The results show that the method can accurately present the outline of the small hole, the circumferential resolution of the small hole is less than 1° and the dimensional accuracy and position error are less than 0.1 mm.

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