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PolyCMUTs for ultrasonic nondestructive testing of carbon fiber reinforced plastic: a feasibility study

Welsch, Jonas (2019) PolyCMUTs for ultrasonic nondestructive testing of carbon fiber reinforced plastic: a feasibility study. DLR-Interner Bericht. DLR-IB-BT-AU-2021-13. Master's. Universität Stuttgart. 67 S. (Unpublished)

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Abstract

The following thesis describes the research conducted in between May and October of 2019 on the topic of PolyCMUTs and their usability for nondestructive evaluation of carbon fiber reinforced plastics. The first step was to calculate the acoustic and mechanical material properties of a provided CFRP test plate and the test of those values with a commercially available CMUT probe. The next part is the explanation of the manufacturing process of new prototypes and the many difficulties that occurred during this process. After several trials a working air coupled ultrasonic transducer was fabricated and then thoroughly characterized. The characterization showed some unexpected behaviour which was then investigated and contributed to a so-called Helmholtz resonance. The resonance phenomena was further explained and the possible benefits in PolyCMUT fabrication were evaluated. The last step was to evaluate these phenomena for further improvement to the technology. The result is that PolyCMUTs can indeed be used for NDE but they need further research and development. A commercial usage is not yet possible.

Item URL in elib:https://elib.dlr.de/140527/
Document Type:Monograph (DLR-Interner Bericht, Master's)
Title:PolyCMUTs for ultrasonic nondestructive testing of carbon fiber reinforced plastic: a feasibility study
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Welsch, JonasUNSPECIFIEDUNSPECIFIED
Date:17 December 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:67
Status:Unpublished
Keywords:ultrasonic transducers, polymer-based capacitive micromachined ultrasonic transducers, air-coupling, non-destructive inspection, prototype manufacture, Helmholtz resonance
Institution:Universität Stuttgart
Department:Institut für Flugzeugbau
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Augsburg
Institutes and Institutions:Institute of Structures and Design > Automation and Production Technology
Deposited By: Huber, Armin
Deposited On:20 Jan 2021 09:44
Last Modified:20 Jan 2021 09:44

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