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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0 1 1 2 2 3 3 4 4 5 0 15 30 45 60 75 90 Tsai Wu Factor of Safety Ply Angle (°) Polyester Vinylester Epoxy

0 1 1 2 2 3 3 4 4 5

Polyester Vinylester Epoxy

Max Stress Factor of Safety

0

15 30 45 60 75 90

Ply Angle (°)

Fig. 9. Tsai-Wu ’s factor of safety

Fig. 10. Maximum stress criteria factor of safety

Based on the failure criteria, unidirectional E-glass fiber with matrix Epoxy on ply angle 0° has the highest safety factor value of 4.23 for Tsai-Wu, as shown in Fig. 9 and 4.13 for max stress criteria as shown in Fig. 10, and it appears that unidirectional E-glass fiber with matrix Epoxy with ply angle 0° has a reasonably good stiffness level with a deflection value of 15 mm, as shown in Fig. 8. 5. Conclusions This paper presented the study of the effect of the ply angle of the design of composite navigational buoy under hydrostatic pressure. A linear analysis was performed to study the effects of the ply angle on the structural strength design criteria. The result of the analysis from the five layers shows the effect of the orientation of the fibers in the three types of a matrix, showing different stress results in each layer. The criteria of the Tsai-Wu and maximum stress safety factors provide a valuable reference for the navigational buoy design to increase performance with respect to the sea environment. The Tsai-Wu failure criteria can efficiently predict the first-ply failure of elliptical composite submersible pressure hull under hydrostatic pressure. Epoxy/E-glass with ply angle 0 shows the highest Tsai-Wu factor of safety compared to Polyester/E-glass and Vinyl ester/E-glass. Acknowledgments The author would like to acknowledge P.T. Kemenangan for data on buoy design. This work is done by collaboration with the Laboratory of Design and Computational Mechanics, Department of Mechanical Engineering, Universitas Sebelas Maret, Indonesia. References Berteaux, H.O., 1976. Buoy Engineering Woods. John Wiley & Sons, New York, US. Bureau Veritas., 2017. Composite strength analysis of composite laminates user guide. Bureau Veritas, Marine Division Development Department, Paris, France. Cao, B., Bae, D.M., Sohn, J.M., Prabowo, A.R., Chen, T.H., Li, H., 2016. Numerical analysis for damage characteristics caused by ice collision on side structure. International Conference on Offshore Mechanics and Arctic Engineering 49996, V008T07A019. Fathallah, E., Qi, H., Tong, L., Helal, M., 2014. Design optimization of lay-up and composite material system to achieve minimum buoyancy factor for composite elliptical submersible pressure hull. Composite Structures 121, 16-26. Fathallah, E., Qi, H., Tong, L., Helal, M., 2014. Optimal Design Analysis of Composite Submersible Pressure Hull. Applied Mechanics and Materials 578, 89 – 96. IALA., 2018. Guideline G1006 Plastic Buoys. IALA, Paris, France. Imran, M., Shi, D., Tong, L., Muhammad, H.W., 2019. Design optimization of composite submerged cylindrical pressure hull using genetic algorithm and finite element analysis. Ocean Engineering 190, 106443 Jeong, S.M., Son, B.H., Lee, C.Y., 2020. Estimation of the motion performance of a light buoy adopting ecofriendly and lightweight materials in waves. Journal of Marine Science and Engineering 8, 139.