MATEC Web Conf.
Volume 258, 2019International Conference on Sustainable Civil Engineering Structures and Construction Materials (SCESCM 2018)
|Number of page(s)||6|
|Section||Hybrid and Composite Structures, Smart Materials and Structures, Special Structures|
|Published online||25 January 2019|
The experiment of four-point bending behaviours of helicoidally laminated CFRPs
1 Hokkaido University, Graduate School of Engineering, Kita 13 Nishi 8, Kita-ku, Sapporo, Japan
2 Hokkaido University, Faculty of Engineering, Kita 13 Nishi 8, Kita-ku, Sapporo, Japan
3 Hokkaido University, Technical Center of Engineering, Kita 13 Nishi 8, Kita-ku, Sapporo, Japan
* Corresponding author: Ikuma.firstname.lastname@example.org
The purpose of this study is to mitigate the brittle behaviour of CFRP. CFRP is a composite material of carbon fibre and a thermosetting resin. As a feature, it has a low density than metallic materials such as steel and aluminium, and it is excellent in specific strength, specific stiffness, and is corrosion resistant. In the civil engineering field, CFRP is expected to be utilized for durability improvement and long life achievement. However, it is necessary to be careful when using it as a primary member, because the behaviour at the time of fracture is very brittle, thereby it is necessary to set a large safety factor at the time of design. One way to achieve the purpose of the current study is to follow a biological structure, so-called biomimetics. In this study, mantis shrimp is selected. The characteristic structure of its forefoot is that chitin fibres are stacked while changing helicoidally their angles. It is said that the forefoot can withstand a thousand times the force of its own weight because of its structure. Helicoidally laminated CFRP is fabricated by processing prepreg sheets of unidirectional carbon fibres. Four laminated structures were examined in which four-point bending experiments were carried out under displacement control of 2 mm/min, and load and displacement were recorded. During the experiments, the specimens were observed until fracture with a video camera. As a result, the brittle behaviour was improved significantly as the orientation angle difference of the fibre sheets decreased.
© The Authors, published by EDP Sciences, 2019
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