Monitoring matrix cracking in composite laminates using built-in piezoelectric sensors
Abstract/Contents
- Abstract
- Fiber reinforced composite materials use has increased tremendously in many applications from aerospace structures to sporting goods. These materials have many advantages, but the major challenge in composites design is their damage mechanics. Matrix cracking develops first, decreasing structural performance and promotion of other damage development. The state-of-the-art inspection techniques cannot quantify crack density and they require the component to be off-service. For better design, safety, and maintenance of composite structures it is desirable to monitor the increase of cracks in-service. The objective of this investigation is to determine the quantity of matrix cracks in a composite laminate rapidly and in-service using built-in piezoelectric actuators and sensors. A diagnostic method was proposed which compared the sensed signal before and after the presence of matrix cracks and related these signal changes to crack density. It was found that change in the signal's Power Spectral Density can be used to quantify crack density, and its sensitivity was dependent on the actuator to sensor orientation. This orientation dependence was found to be the same as that of the laminate's stiffness degradation. A crack density quantification model was developed that uses signal changes and theoretical laminate stiffness parameters. The model was tested on two layup configurations, and its crack density estimates matched experimental crack density values within established error bounds.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Larrosa, Cecilia Carmen |
|---|---|
| Associated with | Stanford University, Department of Aeronautics and Astronautics. |
| Primary advisor | Chang, Fu-Kuo |
| Thesis advisor | Chang, Fu-Kuo |
| Thesis advisor | Cantwell, Brian |
| Thesis advisor | Christensen, R. M. (Richard M.) |
| Thesis advisor | Springer, George S |
| Advisor | Cantwell, Brian |
| Advisor | Christensen, R. M. (Richard M.) |
| Advisor | Springer, George S |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Cecilia Carmen Larrosa. |
|---|---|
| Note | Submitted to the Department of Aeronautics and Astronautics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Cecilia Carmen Larrosa
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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