Abstract
Metal parts have recently been substituted with composite in the transport industry due to their characteristics, which include increased strength, stiffness and reduced weight. Acousto-ultrasonics is an inspection technique, which combines the acoustic emission methodology with ultrasonic simulation of stress waves to assess defect states in materials. Acousto-ultrasonics belong to the family of inspection tools, which emerge to identify and measure occurred damage or decay state of transportation modes and infrastructure. In this paper, we attempt to detect defects by performing initial experiments with composite specimens. Specifically, the attenuation of simulated acoustic emission events are measured aiming to further investigate the phenomenon of edge reflections from small composite specimens. Also, only two features from the signal can be used to detect two different types of faults. Finally, a new triangular–like larger specimen is introduced and assessed using the two sensors, in order to show the difference of the two aforementioned features when two different material and dimension specimens are used.
Highlights
The transportation industry has been changing direction by substantially reducing the use of metal parts paving the way towards the use of composite materials parts [1]
The Average Signal Level’ (ASL) exhibits the usual attenuation over distance, and it can be noted that the drop is not substantial which makes the feature ideal for above 40 or 50 cm distant failure sources
The average frequency appears somewhat erratic for the long distances. This feature along with the Reverberation Frequency (Fig. 5(c)), which can be thought of as the “ring down” frequency since this is the average frequency determined after the peak of the Acoustic Emission (AE) waveform, and Initiation Frequency, which can be thought of as the “Rise Time” frequency, all three features at long distances appear to have an erratic behaviour with high frequency values
Summary
The transportation industry has been changing direction by substantially reducing the use of metal parts paving the way towards the use of composite materials parts [1]. Composites possess certain properties including strength, stiffness and reduced weight [2]; their emergence in the aviation and transport industry in general is not a surprise. These characteristics constitute composite materials an appropriate solution for other modes of transportation such as the railway industry [3]. Reducing the rail car-body mass, which often comprises heavy metal parts, is the necessary procedure for the generation of trains as to introduce energy saving. A primary action to reduce weight could be the substitution of steel with composite components while maintaining safety [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
