Zhang, Xuande
(2015)
A Line-Focus Transducer System for Property Characterization of Materials Fabricated by Additive Manufacturing.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Nondestructive evaluation methods have been studied increasingly in recent years. Due to its characteristics, such as high-resolution, low cost, etc., ultrasonic testing has become one of the most used NDE methods. Furthermore, principles of ultrasonic have also provided a novel tool for materials property characterization.
A line-focus PVDF ultrasonic wave transducer was designed, fabricated, and tested. Numerous concepts of ultrasonic wave near boundary were discussed. Rayleigh (Surface) wave, which plays a vital role in this work, has been investigated and tested by the PVDF transducer. With tested Rayleigh wave velocities, elastic constant (Young’s Modulus) could be derived. Conclusions could be drawn through comparison since the relationship between elastic constants and Rayleigh wave was well studied.
In addition to that, a short introduction of additive manufacturing was made briefly. Two additive manufacturing methods, laser-based and water-based were mentioned. Since properties of finished sample of additive manufacture still remain uncertainty. Samples fabricated in these two methods have been tested as well as standard part. The comparisons between these samples have been done in the end.
The major goals of this work are to: 1) study the basic knowledge of Rayleigh wave properties and its applications; 2) develop an acoustic understanding of material fabricated in different methods; and 3) verify the relationship between elastic constants and surface wave velocity.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
9 June 2015 |
| Date Type: |
Publication |
| Defense Date: |
7 April 2015 |
| Approval Date: |
9 June 2015 |
| Submission Date: |
14 May 2015 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
86 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Mechanical Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Rayleigh Wave, Material Characterization |
| Date Deposited: |
09 Jun 2015 13:10 |
| Last Modified: |
15 Nov 2016 14:28 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/25221 |
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