AlGhamdi, Saleh
(2023)
Characterizing Isotropic Materials in Corrosive Environments: A Non-Destructive Testing Approach using an Advanced Line Focus Transducer.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Corrosion plays a considerable role in metal degradation. For example, approximately 40% of the defense system maintenance is directed toward corrosion-related maintenance with an annual cost of $23 billion [2]. This research used an efficient noninvasive approach to characterize new materials, such as 3D print and metallic materials, using an improved lens-less line focus ultrasound transducer (LFT) system to measure the targeted structure under a harsh corrosive environment.
The purpose of the study is to develop a variety of different lens-less line focus transducer designs and validate them, considering the optimum design to define elastic constants of material structure. For this aim, the designed line focus transducers considered various focal lengths and aperture angles to capture Rayleigh surface wave and longitudinal bulk wave that relates to stiffness constants. Next step in the study considering the lack of any studies using the system in a corrosive environment, which raises the limitation of using the current design in a real-time testing in acidic environment, and to resolve this limitation, a proposed novel modification, includes coating the PVDF element using a paryelen-C and using different corrosion resistance casing for testing in high acidity solution. Next, some experiments will be conducted after fabricating the coated and uncoated LFT to compare the results and validate the new modifications.
After that, the Line focus transducer will determine the elastic constants of isotropic materials. The elastic constants will be derived using the Time-Resolved method relating the defocus distance ∆z and the time difference ∆t between the bulk longitudinal wave and Rayleigh surface wave. new materials like 3D print will be tested to validate the Transducers, Elastic stiffness constants such as Young's & shear modulus and Poisson Ratio will be defined.
This final segment explores the application of LFT on novel Bulk Metallic Glasses, aiming to categorize the material while also verifying the design's consistency and reliability in producing repeatable results. This section includes the latest modifications to the Transducer and real-time testing under corrosive conditions such as seawater and acidic solutions. This represents a first in literature, serving to validate the proposed modifications through material characterization.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
14 September 2023 |
| Date Type: |
Publication |
| Defense Date: |
14 July 2023 |
| Approval Date: |
14 September 2023 |
| Submission Date: |
28 July 2023 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
150 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Line Focus Transducer, LFT, Bulk metallic Glasses, BMG, 3d print, Acid, new design |
| Date Deposited: |
14 Sep 2023 13:32 |
| Last Modified: |
14 Sep 2023 13:32 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/45160 |
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