[논문]Detection and Quantification of Defects in Composite Material by Using Thermal Wave Method

Ranjit, Shrestha; Kim, Wontae

doi:10.7779/jksnt.2015.35.6.398

Detection and Quantification of Defects in Composite Material by Using Thermal Wave Method 원문보기

비파괴검사학회지 = Journal of the Korean Society for Nondestructive Testing, v.35 no.6, 2015년, pp.398 - 406

Ranjit, Shrestha (Department of Mechanical Engineering, Kongju National University) , Kim, Wontae (Division of Mechanical & Automotive Engineering, Kongju National University)

Abstract ▼ AI-Helper

This paper explored the results of experimental investigation on carbon fiber reinforced polymer (CFRP) composite sample with thermal wave technique. The thermal wave technique combines the advantages of both conventional thermal wave measurement and thermography using a commercial Infrared camera. The sample comprises the artificial inclusions of foreign material to simulate defects of different shape and size at different depths. Lock-in thermography is employed for the detection of defects. The temperature field of the front surface of sample was observed and analysed at several excitation frequencies ranging from 0.562 Hz down to 0.032 Hz. Four-point methodology was applied to extract the amplitude and phase of thermal wave's harmonic component. The phase images are analyzed to find qualitative and quantitative information about the defects.

주제어

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문제 정의

This paper explored the experimental results of LIT inspection of CFRP composites. Artificial inclusion of foreign material to simulate defects of different shape and size at different depths was considered in order to analyze the behavior of thermal waves.
This study presents the use of LIT with image processing for qualitative and quantitative evaluation of defects in CFRP composite. The response of every material differs on the thermal excitation and depends on the way of stimulation.

제안 방법

Investigation of phase image is done relative to phase contrast and defect geometry for the detected defects which is located at 62.5 % depth (ply 5 and ply 6) and was plotted with respect to excitation frequency. To determine the phase contrast, phase value of the defective area was subtracted from the phase of the sound area near the defects.
The experiment was conducted at numerous excitation frequencies to cross-examine the sample ranging from 0.562 Hz down to 0.032 Hz. Diffusion length of the thermal signal was chosen for the determination of excitation frequencies.
4 mm thickness with artificial inclusions of different shape and size at different depths was considered. The idealized shape of different circular, elliptical and 8 point star defects with different depths was selected to demonstrate the effects of geometry.

대상 데이터

5-13 μm was used as an infrared system. An IR lens of 41.3 mm was used with the camera, located to fully use the field of view (FOV) around the whole sample. FLIR R&D software was used to acquire the images.
Artificial inclusion of foreign material to simulate defects of different shape and size at different depths was considered in order to analyze the behavior of thermal waves. An experimental setup was built in thermal design and infrared laboratory of Kongju National University, South Korea. The specimen developed by Korea Research Institute of Standard and Science (KRISS), South Korea and Korea Aerospace University, South Korea has been used in this study.
For the generation of sinusoidal waves a programmable function generator (Agilent 33210A, Malaysia) was used. The acquisition system consisted of a PC in connection with an infrared camera. FLIR SC 645 infrared camera equipped with 640 × 480 pixel resolution and sensitivity of 7.
An experimental setup was built in thermal design and infrared laboratory of Kongju National University, South Korea. The specimen developed by Korea Research Institute of Standard and Science (KRISS), South Korea and Korea Aerospace University, South Korea has been used in this study.

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