Study on the Defects Detection in Composites by Using Optical Position and Infrared Thermography
| Autor: | Hee-Sang Park, Jeong-Hak Park, Koo-Ahn Kwon, Man-Yong Choi, Wonjae Choi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science business.industry Infrared 02 engineering and technology 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences 0103 physical sciences Thermography Thermal Reflection (physics) Irradiation Composite material 0210 nano-technology business Thermal effusivity Thermal energy |
| Zdroj: | Journal of the Korean Society for Nondestructive Testing. 36:130-137 |
| ISSN: | 1225-7842 |
| DOI: | 10.7779/jksnt.2016.36.2.130 |
| Popis: | Non-destructive testing methods for composite materials (e.g., carbon fiber-reinforced and glass fiberreinforced plastic) have been widely used to detect damage in the overall industry. This study detects defects using optical infrared thermography. The transient heat transport in a solid body is characterized by two dynamic quantities, namely, thermal diffusivity and thermal effusivity. The first quantity describes the speed with thermal energy diffuses through a material, whereas the second one represents a type of thermal inertia. The defect detection rate is increased by utilizing a lock-in method and performing a comparison of the defect detection rates. The comparison is conducted by dividing the irradiation method into reflection and transmission methods and the irradiation time into 50 mHz and 100 mHz. The experimental results show that detecting defects at 50 mHz is easy using the transmission method. This result implies that low-frequency thermal waves penetrate a material deeper than the high-frequency waves. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|