Purpose: Analysis of non-destructive testing systems polymer composite in terms of current
solutions in the area of methodology and devices. Analysis of contemporary standards for
non-destructive testing of polymer composites established by ASTM. Analysis of Flir ONE
camera capabilities in non-destructive testing composite carbon-epoxy composites.
Design/methodology/approach: The thermal imaging tests of the carbon-epoxy composite
discontinuity were carried out using a thermal imaging camera and Flir One accessory for
an iOS phone. The tests were performed on carbon-epoxy composite samples measuring
100x100 mm. In order to simulate the discontinuity in a sample by the Resin Transfer Molding
(RTM) method, a 30x30 mm PTFE film was inserted between the reinforcement layers. The
thickness of the sample with discontinuity was 2 mm. Water was added to the selected sample
sites. Samples were placed on a 50°C heated plate to record thermal images and thermal
images combined with visual contours of samples with simulated defects. Area Calculator –
SketchAndCalc Icalc, Inc. was used to describe the size and location of the defects.
Findings: As a result of the tests, the use of the Flir One thermal imaging device in epoxycarbon
composite discontinuity tests has been demonstrated, and a methodology has been
proposed to measure geometrical features of defects.
Research limitations/implications: The description of welded joint structure and
mechanical properties was based on welding toughened steels by using an innovative
welding method and a filler that has been proposed.
Practical implications: The development of thermal imaging studies of polymer
composite discontinuity using the Flir One thermal imaging camera and accessory with
iOS opens up the possibility of conducting a basic inspection of composite materials in
production plants, and even for simplicity – also in small laboratories.
Originality/value: In order to improve the quality of imaging of small items using the Flir One mobile
camera, the use of cheap and readily available lenses used in laser optics has been tested positively.
Identification of structural defects in composite materials by the thermal imaging non-destructive testing method
