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Improved flaw detection and characterization with difference thermography
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Zalameda, Joseph N. Howell, Patricia A. Winfree, William P. |
| Copyright Year | 2011 |
| Description | Flaw detection and characterization with thermographic techniques in graphite polymer composites is often limited by localized variations in the thermographic response. Variations in properties such as acceptable porosity, variations in fiber volume content and surface polymer thickness result in variations in the thermal response that in general cause significant variations in the initial thermal response. These variations result in a noise floor that increases the difficulty of detecting and characterizing deeper flaws. The paper investigates comparing thermographic responses taken before and after a change in state in a composite to improve the detection of subsurface flaws. A method is presented for registration of the responses before finding the difference. A significant improvement in the detectability is achieved by comparing the differences in response. Examples of changes in state due to application of a load and impact are presented. |
| File Size | 868084 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110011183 |
| Archival Resource Key | ark:/13960/t0zp9160w |
| Language | English |
| Publisher Date | 2011-04-25 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Characterization Thickness Nondestructive Tests Temperature Effects Porosity Floors Defects Loads Forces Thermography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
