Compressive fracture aspect of thick quasi-isotropic carbon fiber reinforced plastic laminates

Published on Sep 8, 2019in Composites Science and Technology7.094
· DOI :10.1016/J.COMPSCITECH.2019.107706
Keita Goto4
Estimated H-index: 4
(Nagoya University),
Masahiro Arai13
Estimated H-index: 13
(Nagoya University)
+ 2 AuthorsTakashi Ishikawa34
Estimated H-index: 34
(Nagoya University)
Abstract The compressive fracture aspect for the thick quasi-isotropic carbon fiber reinforced plastic (CFRP) laminates was investigated using a high-speed camera to clarify the progress of the brooming fracture. The compressive fracture types of the laminates could be classified into two groups, i.e., the fractures initiating from the innermost 0 ∘ ply and those initiating from the fixed sections of the specimen. The standard deviation of the compressive strength for the innermost 0 ∘ ply-initiated fracture type was larger than that for the fixed-section fracture type, although the average compressive strengths for each fracture mode were similar. The initial fracture in the innermost 0 ∘ ply was caused by the microbuckling of the fibers. The numerical results demonstrated a considerable out-of-plane shear stress around the free edges of the specimen, especially for the innermost 0 ∘ ply. Such a shear stress is thought to cause the microbuckling at the innermost 0 ∘ ply, with the crack subsequently propagating toward the outer plies of the specimen. The compressive strength of the innermost 0 ∘ ply was an important factor affecting the fracture behavior of the thick quasi-isotropic CFRP laminates.
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