PSI - Issue 27

Nurul Huda et al. / Procedia Structural Integrity 27 (2020) 140–146 Huda and Prabowo / Structural Integrity Procedia 00 (2019) 000 – 000

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challenging to maintain, and have reported problems such as collisions with ships resulting in human injuries (Jeong et al., 2020). IALA G1006 2018 presented the composite FRP as an alternative material for navigational buoy (IALA, 2018). The composite material has high strength: weight ratio, good corrosion resistance, good sound absorption performance, excellent manufacturability, long service life, etc. (Fathallah et al., 2014). These functional properties make composite a suitable material for the navigational buoy. Pan et al. (2015) investigated the optimization of ply sequence, thickness, and angle of composite Carbon/Epoxy of cylindrical shells subjected to hydrostatic pressure. The results show that buckling is the major destroy form. Imran (2019) presented study design optimization of composite submerged pressure hull under 3 MPa hydrostatic pressure, which corresponds to 300 m depth, is carried out. The number of layers and orientation angles are optimized for lay-ups [0 /90 /0 ] , [10 / ̵10 /90 / ̵10 /10 ] , [ 1 / 2 ] [ 1 / 2 / 3 ] and [ 1 / 2 / 3 / 4 / 5 ] using three unidirectional composite materials, Carbon/Epoxy, Glass/Epoxy, and Boron/Epoxy. Fatallah (2014) analyzed different lay-up sequences for laminates including, cross-ply [0 /90 ] , [90 /0 ] , and the angle-ply [0 /90 ] , [0 /± ] , [90 /± ] , [± ] , are analyzed with constraints based on the failure strength and the buckling strength of the pressure hull, incorporating both the Tsai-Wu and the maximum stress failure criteria. IALA Guidelines 1006 does not cover the detail of lamination and ply angle of the composite navigational buoy (IALA, 2018). In this study, a navigational buoy in the form of a cylinder, as shown in Fig. 1 is selected and study of ply angle effect using finite element analysis software SolidWorks Simulation Premium to be better structural integrity incorporating both the Tsai-Wu and the maximum stress failure criteria. Finite element analysis itself has been proven to be adequate to analyze structural performance under various loading and environmental conditions, even to complex and high nonlinear phenomena, e.g., collision (Prabowo et al., 2018), explosion (Zhang et al., 2020), grounding (Prabowo et al., 2019), ice-structure interaction (Cao et al., 2016), fluid-structure effect (Muttaqie et al., 2018), and soil-structure behavior (Yeter et al., 2019).

Fig. 1. The finite element model and boundary conditions.

In the present work, a composite navigational buoy with different fiber orientations, i.e., 0°, 15°, 30°, 45°, 60°, 75°, and 90°, is analyzed using three composite materials, i.e., Polyester/E-glass, Vinyl ester/E-glass, Epoxy/E-glass through comparative analysis. The effect of the ply angle on composite cylindrical shells subjected to hydrostatic pressure is investigated. Both stress and deflection are considered in the study.

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