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.
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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/ | ||||||||
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Document Type: | Monograph (DLR-Interner Bericht, Master's) | ||||||||
Title: | PolyCMUTs for ultrasonic nondestructive testing of carbon fiber reinforced plastic: a feasibility study | ||||||||
Authors: |
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Date: | 17 December 2019 | ||||||||
Refereed publication: | Yes | ||||||||
Open Access: | Yes | ||||||||
Number of Pages: | 67 | ||||||||
Status: | Published | ||||||||
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: | 07 Aug 2023 17:53 |
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