Bonded repair issues for composites: An investigation approach based on infrared thermography

NDT-based design of joint material for the detection of bonding defects by infrared thermography

“…The active IRT procedure developed by authors [7] uses a specific experimental device specially designed to control tests conditions (Fig. 2).…”

“…Note that the detailed design of the test procedure and choice justification can be found in Ref. [7]. The representation of heat transfer inside the material can be modelled using the classical thermodynamics background [15].…”

“…Its intensity ϕ has been identified on reference materials [7] and evolves in form of a step of 10s (beginning at t ¼ 2s, end at t ¼ 12s, see Fig. 3).…”

“…Industrial constraints encourage the development of fully non-contact, easy handling and data processing NDT methods. In this way, authors have recently proposed a specific experimental procedure to improve the capacity of active IRT to detect a bonded interface inside a carbon-epoxy repaired assembly [7]. In this work, a step heating approach is used for exciting the specimen and the thermographic data processing is simply based on the thermal contrast induced on the structure surface.…”

“…[7] (section 1), the influence of the joint thermal behaviour onto the assembly thermal response is studied by means of the numerical model of the thermal problem. The new joint material (global behaviour, relevant additives, volume fraction) will then be designed in order to highlight bonding defects inside the assembly (section 2).…”