Experimental Investigation Using Acoustic Emission Technique for Quasi-Static Cracks in Steel Pipes Assessment

Machines

Ahmed Osman¹  Mohamed Shehadeh¹  AlyAbdelbaky Elbatran¹  John Steel²  Robert Reuben² 

[1] Marine Engineering Department, College of Engineering and Technology, Arab Academy of Science, Technology and Maritime Transport, Abu Kir, Alexandria 1029, Egypt;Mechanical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;

关键词: acoustic emission;    bending;    quasi-static crack;   

DOI  :  10.3390/machines9040073

来源: DOAJ

【 摘 要 】

Acoustic emission (AE) is a phenomenon where transient waves of stress are generated during deformed material, which is applied to detect and monitor the cracks and cracks propagation. The majority of related literature studied simulated wave sources, which were utilized for a single point of a pipe and have been strictly controlled by temporal characteristics. Therefore, the realistic wave sources which do not have known temporal characteristics are studied in the present work. The realistic source is quasi-static crack propagation under three-point bending. The distortions of AE signals are experimentally evaluated by testing the AE signals of crack propagation using simulated sources. A variety of stress intensities are applied on a steel pipe to determine the effect of stress type and intensity on the characteristics of the source using time and frequency domains. Machines are mounted on the steel pipe to locate and reconstitute the features of time and frequency domain of the AE sources. It is concluded that the AE energy was sensitive to the crack size which was concerning to the transition of plane-stress to plane-strain. The potential of AE technique for identifying the nature, intensity and location of crack propagation is demonstrated.

【 授权许可】

Unknown