AI Article Synopsis
- Fatigue-crack closure can lead to underestimating or missing cracks in ultrasonic testing, mainly influenced by environmental factors like high temperature.
- This study focused on how heat processing affects crack detection using a surface-acoustic-wave phased array (SAW PA), which is effective in visualizing surface defects.
- It was found that after heat processing, crack responses diminished significantly, and combining SAW PA with techniques like global preheating and local cooling (GPLC) improved the imaging of these closed cracks, highlighting the need for further understanding of fatigue-crack closure mechanisms caused by heat.
Article Abstract
Crack closure can cause the underestimation or misdetection of fatigue cracks in ultrasonic testing (UT). Fatigue-crack closure due to an environmental factor, i.e., high temperature, was found in eddy current testing (ECT), which is used to inspect the vicinity of surfaces. However, its effect and countermeasures have yet to be examined in UT. In this study, we examined the fatigue-crack closure induced by heat processing using a surface-acoustic-wave phased array (SAW PA). SAW PA is a phased-array imaging method using Rayleigh waves, which can sensitively visualize defects in the vicinity of surfaces. As a result, the intensity of crack responses visualized by SAW PA markedly decreased after the heat processing of a fatigue-crack specimen. Furthermore, we demonstrated that the combination of SAW PA with a crack opening method, global preheating and local cooling (GPLC), and a load difference phased array (LDPA) is useful for the high-selectivity imaging of closed fatigue cracks. We also discussed a possible mechanism of the fatigue-crack closure induced by heat processing.
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| http://dx.doi.org/10.1016/j.ultras.2021.106629 | DOI Listing |
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