PSI - Issue 47

Yogie Muhammad Lutfi et al. / Procedia Structural Integrity 47 (2023) 660 – 667 Lutfi et al. / Structural Integrity Procedia 00 (2019) 000 – 000

666

7

Table 1. Comparison between the finite element approach and IACS-CSR mathematical model. Model no. Slenderness (-) Inertia of Area (mm 4 ) Pressure Imperfection (%) Ultimate Strength FEA (MPa)

Ultimate Strength IACS (MPa)

Difference (%)

1

1.38

279176315.4

Yes

100 100 100 100

280.59 282.97 260.06 269.69

295.74

5.12 4.32

No

2

1.38

181035311.3

Yes

291.30

10.72

No

7.42

4. Conclusions In this research, the ultimate strength calculation was carried out on a designed stiffened panel as an idealization of the bulk carrier structures. The model is divided into 2, namely, the light model and the heavy model. The choice of the model refers to the location of the stiffened panels, the sides, and the bottom of the hull. The ultimate strength calculation is carried out based on IACS-CSR 2022 under buckling conditions. There are 2 loadings, pressure with a value of 0.16 MPa, and imposed displacement on both sides of the web of 5 mm. Based on the results of ultimate strength calculations, in each model, both the light model and the heavy model, there is a decrease in ultimate strength. The table shows that the ultimate strength in each model decreases due to pressure. The addition of pressure has a negative effect on the ultimate strength or can reduce the strength of the model. It can be said that the smaller the inertia of the area, the lower the ultimate strength. The ultimate strength simulation results show a decrease from the IACS-CSR 2022 ultimate strength. As a recommendation for future research, this research needs to add another model to get different inertia and add different imperfection values to obtain results to quantify the effects of the parameters on the ultimate strength characteristics. Acknowledgments This work was supported by the RKAT PTNBH Universitas Sebelas Maret Year 2023, under the Research Scheme of “ Penelitian Unggulan Terapan ” ( PUT-UNS), with research grant/contract no. 228/UN27.22/PT.01.03/2023. The support is gratefully acknowledged by the authors. Reference Adiputra, R., Yoshikawa, T., Erwandi, E., 2023. Reliability-Based Assessment of Ship Hull Girder Ultimate Strength. Curved and Layered Structures, 10, 20220189. Alwan, F.H.A., Prabowo, A.R., Muttaqie, Muhayat, N., Ridwan, R., Laksono, F.B., 2022. Assessment of ballistic impact damage on aluminum and magnesium alloys against high velocity bullets by dynamic FE simulations. Journal of the Mechanical Behavior of Materials, 31, 595-616. Amlashi, H.K.K., Moan, T., 2009. Ultimate strength analysis of a bulk carrier hull girder under alternate hold loading condition, Part 2: Stress distribution in the double bottom and simplified approaches. Marine Structures, 22, 522-544. Andrić , J., Žanić , V., 2010. The global structural response model for multi-deck ships in concept design phase. Ocean Engineering, 37, 688-704. Ansori, D.T.A., Prabowo, A.R., Muttaqie, T., Muhayat, N., Laksono, F.B., Tjahjana, D.D.D.P., Prasetyo, A., Kuswardi, Y., 2022. Investigation of Honeycomb Sandwich Panel Structure using Aluminum Alloy (AL6XN) Material under Blast Loading. Civil Engineering Journal, 8, 1046 1068. Cepowski, T., Chorab, P., 2021. The use of artificial neural networks to determine the engine power and fuel consumption of modern bulk carriers, tankers and container ships. Energies, 14, 4827. Dabit, A.S., Lianto, A.E., Branta, S.A., Nubli, H., Laksono, F.B., Prabowo, A.R., Muhayat, N., 2020. Design of Fish Feed Spreader Unmanned Vessels in Coastal Areas Based on Arduino Microcontroller. Mekanika, 19(2), 74-82 (In Indonesian). Do, Q.T., Muttaqie, T., Nhut, P.T., Vu, M.T., Khoa, N.D., Prabowo, A.R., 2022. Residual ultimate strength assessment of submarine pressure hull under dynamic ship collision. Ocean Engineering, 266, 112951. Estefen, S.F., Chujutalli, J.H., Soares, C.G., 2016. Influence of geometric imperfections on the ultimate strength of the double bottom of a Suezmax tanker. Engineering Structures, 127, 287-303. Fajri, A., Prabowo, A.R., Muhayat, N., 2022. Assessment of ship structure under fatigue loading: FE benchmarking and extended performance analysis. Curved and Layered Structures, 9, 163-186. Garbatov, Y., Saad-Eldeen, S., Soares, C.G., 2015. Hull girder ultimate strength assessment based on experimental results and the dimensional theory. Engineering Structures, 100, 742-750.