Infrared thermographic detection and characterisation of impact damage in carbon fibre composites: results of the round robin test

Abstract

Results of inspecting an impact damaged carbon fibre composite specimen are reported. Several physical test procedures and processing .algorithms have been analysed within the framework of the international Round Robin Test. A statistical means for rating non-destructive testing techniques is proposed to convert otiginal infrared images to defect maps that are of special interest for end-users. The :potentials of the techniques for oharacterising shape and depth distribution of impact damage in carbon fibre composites are discussed, 'including comparison with ultrasonic C-scan results.

Peculiarities of detecting Teflon defect surrogates in CFRP by transient IR thermography

“…The temperature inversion phenomenon described by some authors [3] has seemed to be improbable in our experiment because it assumes that a negative m T ∆ signal must be preceded by a classical 'warm' signal that is not our case. Therefore, our task was to choose a model that would fit both the negative temperature signal in the sample A and the positive signal in the sample B.…”

“…It is known that inserting Teflon could introduce air gaps between inserts and a host material [3]. Therefore, Teflon inserts in CFRP are fairly well detected, although the theory predicts rather low signals in the case of an ideal thermal contact between an insert and a host material.…”

“…In this study, we have processed the experimental results by using the approach essentially based on applying some statistical procedures [3]. Each image is characterized by the signal-to-noise ratio (ThermoStat program): For the sample A, the processing results have been rather discouraging.…”

“…IR Thermographic Nondestructive Testing is a promising technique in the inspection of Carbon Fiber Reinforced Plastic (CFRP) [1][2][3]). In this study, we come back to the detection of Teflon inserts, which are often used as CFRP defect surrogates.…”

Passive and active thermography application for architectural monuments

“…Since that moment, the significant progress in thermographic techniques was observed [4][5][6][7][8][9][10]. The investigations presented in this paper were realized during [2003][2004][2005][2006] as the research project subsidized by Polish Ministry of Science.…”