In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth

Abstract

This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is described as well as the method used for automatically detecting crack initiation and its subsequent growth. To promote internal crack initiation, specimens containing internal casting defects were tested between the high cycle and very high cycle fatigue regimes (10 7 -10 9 cycles). Preliminary results show the ability of this new device to initiate an internal microstructurally short crack in a reasonable testing time and monitor its growth.

Recent Progress of Synchrotron X-Ray Imaging and Diffraction on the Solidification and Deformation Behavior of Metallic Materials

“…Based on the loading type, these devices can be categorized into in situ tensile loading, axial fatigue loading, [112] rotary bending, et cetera; based on the loading environment, they can be ambient temperature, cryogenic, hightemperature, vacuum, et cetera. Some renowned researchers in the field include Professor Buffière et al [113][114][115][116][117][118] from Institut National des Sciences Appliquées de Lyon, France, Professor Toda et al [119][120][121][122][123][124] from Kyushu University, Japan, Professor Bale et al [125,126] from the University of California, United States, Professor Withers et al [127][128][129][130][131][132] from the University of Manchester, United Kingdom, and Professor Wu et al [133][134][135] from Southwest Jiaotong University, China. A summary of their contribution to the field is listed in Table 1.…”

Neural network segmentation methods for fatigue crack images obtained with X-ray tomography

“…Segmentation of crack images obtained by synchrotron tomography 3.2.1. Limits of the Hessian matrix based method 3D images of fatigue cracks have been recorded by synchrotron tomography in a cast Al sample during a series of in situ ultrasonic fatigue experiments [33].…”

A Defect Detection Method for the Surface of Metal Materials Based on an Adaptive Ultrasound Pulse Excitation Device and Infrared Thermal Imaging Technology

“…erefore, nondestructive testing methods such as ultrasound, radiation, penetration, infrared, and eddy current are often used for regular testing [2][3][4][5][6]. Among them, ultrasonic testing is suitable for various types of workpieces, which can detect surface cracks, internal cracks, and quantify cracks [7][8][9][10][11]. It is currently the most important method for crack detection and quantification [12].…”