Laser transmission welding of composites-Part A: Thermo-physical and optical characterization of materials

Andre Chateau Akue Asseko (1, 2, 3) , Benoît Cosson (1, 3) , Fabrice Schmidt (2) , Yannick Le Maoult (2) , Eric Lafranche (1, 3)

1 Mines Douai EMD - École des Mines de Douai
2 ICA - Institut Clément Ader
3 Université de Lille

In the present study, thermophysical and optical characterization of UD thermoplastic composites materials have been investigated. Knowledge of these parameters is of utmost importance to better understanding of any process that involves laser processing of materials. These properties play an important role during the simulation of the welding process. Two optical parameters namely transmission factor (TA) and reflection factor (RA) are measured using IRFT spectrometer and integrating sphere at the laser wavelength. The transmittivity coefficient (tau(lambda)) and reflectivity coefficient (rho(lambda)) were determined using two approaches. A simplified experimental approach and numerical approach based on an inverse method program. Comparison between the two approaches is presented. A well-design device has been also developed in order to evaluate anisotropic thermal conductivities of composites. And finally we compared the experimental results to the analytical method concerning modeling thermal conductivities in composites.

Mots clés: Optical properties; Thermoplastics composites; Thermal properties; Inverse method; Experimental setup; Laser welding

Domaines: Sciences de l'ingénieur [physics]

Andre Chateau Akue Asseko, Benoît Cosson, Fabrice Schmidt, Yannick Le Maoult, Eric Lafranche. Laser transmission welding of composites-Part A: Thermo-physical and optical characterization of materials. Infrared Physics and Technology, 2015, 72, p. 293-299. ⟨10.1016/j.infrared.2015.02.004⟩. ⟨hal-01611009⟩