Analysis of the tensile and bending strengths of the joints of “Gigantochloa apus” bamboo composite laminated boards with epoxy resin matrix

Abstract

The need for wood in the ship building industry continues to grow every year. An alternative raw material is needed to replace wood at a more affordable price, namely, bamboo laminated boards. However, bamboo has a weak connection between its segments, with a maximum length between components of less than 40 cm. To reduce these weaknesses, the connection between bamboo segments with laminated boards is carried out as follows: scarf joint, butt joint, finger joint, desk joint, and tongue and groove joint. The study aims to determine the connection’s effect on each connection variation’s strength. Tensile tests and bending tests were carried out on the test specimens. The average results obtained were quite varied for the tensile test, which were in the range of 81.36–118.62 MPa, while the results of buckling test were in the range of 395.28–475.89 MPa. This study revealed that the connection of the specimen with seven layers had a value of 118.62 MPa in the tensile strength test and 475.89 MPa in the buckling strength test, while 3 layers finger joint samples with the lowest buckling tensile strength value had a value of 81.36 MPa tensile strength and 395.28 MPa bending strength.

Mechanical Properties Evaluation of Laminated Composites of Petung Bamboo (Dendrocalamus asper) and Coconut Coir Fiber as Ship Construction Components

“…The Tsai-Hill criterion indicates that as the fiber orientation angle increases from 0°, the composite's tensile and compressive properties will continue to decline [37]. Sımılar result can be found in the previous study that laminated bamboo materials achieve the highest tensile strength with the laminates' direction 0° (on-axis laminates) compared to 45°/−45° and 0°/90° layer orientations [12,19]. The flexural strength in the present study is lower than in previous studies due to the use of thicker bamboo.…”

“…To enhance the strength properties of the material, it is recommended to use thinner bamboo that is laminated with a higher number of bamboo layers, as suggested by ref. [12]. Furthermore, the research found that laminated boards without joints and a fiber direction of 0° showed the highest strength, while those with a fiber direction of 45° or 90° experienced a decrease in tensile strength of 52% and 15.7%, respectively.…”

“…In addition, the mechanical behavior of different joint types of laminated bamboo composite, such as scarf joint, butt joint, finger joint, desk joint, and tongue and groove joint, was investigated. Based on the data analysis findings, desk joint connections may be utilized as ship hull material since they meet the minimal standards imposed by BKI [12]. In addition, several researchers have investigated the impact of several factors, such as layer arrangement, bamboo species, oil treatment, and adhesive type, on the mechanical characteristics of laminated bamboo boards.…”