Correlation between lamina directions and the mechanical characteristics of laminated bamboo composite for ship structure

Abstract

With the increased emphasis on the use of recyclable bio-based materials and further understanding of the mechanical properties of laminated bamboo, the development of a new generation of low-cost bamboo-based composites for ship structure has generated a significant interest. Laminated bamboo composites comprising Apus bamboo (Gigantochloa apus) and Waru fiber at different layer orientations were investigated to obtain the mechanical characteristics. The influence of different laminate directions was studied through several methods of mechanical testing, including impact tests using ASTM D256, bending tests using ASTM D7264, and tensile tests using ASTM D3039. Results showed that material strength properties could be improved by using on-axis direction (0°). The bamboo composites with unidirectional (0°) laminate direction exhibited superior mechanical properties to bidirectional laminate directions (45°/−45° and 0°/90°). The addition of Waru fiber improved the mechanical properties of the currently developed material; that is, bending strength increased by about 3.17–14.18% and tensile strength was in the range of 4.88–20.28%. Only those composites with 0° and 0°/90° layer orientations fulfilled the Indonesian Bureau Classification strength threshold.

A signal energy-based acoustic source localization technique for composite laminates

“…Composite laminates are widely used in aerospace and other fields [1][2][3]. The special structural characteristics of composite laminates make them more prone to external impacts [4,5], so it is of great significance to locate the acoustic source of composite laminates in real-time.…”

Peningkatan Kemandirian Nelayan melalui Serangkaian Pelatihan Laminasi Kapal Kayu Berbahan Fiber di Desa Gisik, Cemandi Sidoarjo

“…Hal ini dinilai lebih ekonomis terutama untuk kapal-kapal yang berukuran kecil. Fiberglass Rainforced Plastics (FRP) adalah sejenis material komposit dengan resin sintesis dengan matriks dan serat sebagai kerangka(Chen, 2020) yang dinilai kekuatannya lebih optimal dengan komposisi Chopped Stand Mat (CSM)-woven roving (WR)(Ma'Ruf et al, 2023), beberapa menggunakan serat apus bamboo dan jenis waru dengan layer yang banyak(Tuswan et al, 2023).Untuk menghasilkan perahu fiber yang kuat dan tahan lama, perahu fiber disarankan menggunakan bahan woven roving 600 dan CSM 450(Ziliwu et al, 2023) , gelcoat, katalis, mat/mesh, cat, resin (epoxy resin) yang tahan air laut serta pigmen warna anti Ultra Violet (UV)(Issn et al, n.d.) . Metode hand lay up adalah metode yang paling sederhana dan paling sering digunakan untuk pengolahan komposit.…”