期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 237, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2023.109996
关键词
CFRP; Compressive strength; Filled hole; Thin -ply; Fastener
Through experiments, this study found that the ply thickness has an effect on the filled hole compression (FHC) strength. The FHC strength of quasi-isotropic (QI) laminates increased by 26-45% as the ply thickness decreased from 0.2 to 0.05 mm. The FHC strength was higher for QI laminates with a tightening torque of 7.0 Nm compared to 0 Nm. In addition, the FHC strength of thin-ply QI-CFRP (0.05 mm ply thickness) at a fastener tightening torque of 7 Nm was greater than the un-notched compressive (UNC) strength.
By experimentation, this study investigated ply thickness effects on the filled hole compression (FHC) strength of thin-ply CFRP laminates. The FHC strength of quasi-isotropic (QI) laminates increased by 26-45% with decreasing ply thickness from 0.2 to 0.05 mm. Comparing the case of 0 Nm and 7.0 Nm tightening torque, the FHC strength was more than 28-49% higher for the QI laminates with a tightening torque of 7.0 Nm. The FHC strength of thin-ply QI-CFRP (0.05 mm ply thickness) at a fastener tightening torque of 7 Nm was 675 MPa, which was greater than the un-notched compressive (UNC) strength (590 MPa). Visual observation and X-ray CT results of fractured specimens after FHC testing suggested that bearing damage of the CFRP laminates was prevented under adequate fastener tightening torque. It was inferred that the increase in the FHC strength in thin-ply CFRP was mainly contributed by the increase in the UNC and OHC strength.
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