Sensitivity study of the pressure load parameters of laser shock on CFRP and its influence on the back-face velocity signal
Résumé
In this paper, 3D laser shock modelling on a Carbon Fiber Reinforced Plastic composite laminate is conducted to study the impact of different levels of dynamic loadings on the back-face velocity signal and the damage. The source, a 1064nm Nd-YAG laser in nanosecond regime and providing densities of power up to 4 GW/cm-2 in ablation regime, is focused on a thin stationary water confinement. The pressure to be applied on the CFRP is modeled using the ESTHER laser matter interaction code. Time-space diagrams are associated to the computed back-face velocity signal to depict the meaning of the velocity signal. Both experimental and computed signals due to elastic and damaged behavior are reproduced. As the load is critical in modelling accurately the phenomenon, a sensitivity study will then be conducted to quantify the influence of three parameters: the impulsion signal measurement of the photodiode on the laser-matter interaction, the shape of the load area and the irregularities of the pressure spatial distribution on the load area. Due to the orthotropic behavior of plies, differences are observed on a ply but they may be smoothed upon reaching the back-face.
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