Inverse analysis of interlaminar strength in CFRP laminates using pulse laser spallation method

• DOI: 10.1016/j.compscitech.2021.108938
• Publication Date: 2021-07-26T15:09:07Z
• Authors: Masahiro Arai; Toshiki Chiba; Keita Goto; Akinori Yoshimura
• Keywords: Delamination

Abstract In this article, the interlaminar tensile strength between CFRP prepregs with [0°/90°]s lay-up was evaluated with pulse laser spallation method. Transformation functions were applied to obtain the interlaminar stress in the inverse analyses. The pulsed laser spallation test was used to investigate the dynamic interlaminar strength and the static interlaminar strength was determined by the static stud-pull-test. Two different curing conditions (100 °C and 130 °C) were selected to track the curing degree using via interlaminar strength. Additionally, Arai et al. used in one configuration a carbon nanofiller interlayer film between the 0 and the 90 layer to increase the fracture toughness. The location and behaviour of the delamination was determined by fracture images. The results show that the dynamic interlaminar strength of the CFRP laminates was approximately 30 % higher than that of the static ones. The strength of the specimen cured at 100 °C was 20 % lower than that cured at 130 °C.