Porosity characterization of CFRP parts by ultrasonic and X-ray tomographic non-destructive methods

Porosity is a result of a deficiency in the production process that could lead into the mechanical degradation of CFRP composite structures. Therefore, some checkpoints for determining its presence during part manufacturing have to be established, verifying that precise threshold values are not exceeded. Currently, porosity characterization is carried out by an indirect way using ultrasonic techniques. Depending on the evaluation of signal attenuation, only a qualitative assessment can be performed. In this study, a tomographic study for a non-destructive porosity characterization on CFRP aerospace parts is also presented that lead into an accurate and quantitative assessment of pore volume, size, location and distribution.