PSI - Issue 27

Aknaf Sam Dabit et al. / Procedia Structural Integrity 27 (2020) 163–170 Dabit et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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of 2 kg showed a stress value of 3.708 N/mm 2 , at a capacity of 4 kg showed a stress value of 7.418 N/mm 2 , at a capacity of 6 kg showed a stress value of 9.272 N/mm 2 , and a capacity of 8 kg showed an amount of stress of 9.889 N/mm 2 . The stress value can exceed the material's permit tension because, in the simulation, the content does not have a reinforcing material. Stress simulation results on loading fish feed tanks will be shown in Fig. 9. a b

c

d

Fig. 9. (a) 2 kg Loading; (b) 4 kg Loading; (c) 6 kg Loading; and (d) 8 kg Loading.

5. Conclusions An autonomous unmanned surface vehicle feeder boat is made to answer the problems of fish farmers in Indonesia who have extensive ponds in the distribution of fish food evenly. The results of this sample problem are also based on the results of a survey in the village of Doplang, Klaten, Central Java, Indonesia. Some parts of the boat that have essential roles, such as the hull and tank are simulated to ensure that the boat is safe to make. Based on the results of stress simulation on the hull of the boat subjected to static load, it is obtained that with a load of 1.8 kg or 17.65 N, the stress value is equal to 1.245 N/mm 2 . This value is declared safe because it is lower than the yield strength of the material, which is equivalent to 2 N/mm 2 , the strain value is 3.425, and the displacement value is 1.279 mm. Simulations were carried out on a fish feed tank with a capacity of ± 8 kg. The loading variations in the tank are carried out in stages, starting from 2 kg, 4 kg, 6 kg, and 8 kg. The results of loading on the tank at a capacity of 2 kg show a stress value of 3.708 N/mm 2 , at a capacity of 4 kg shows a stress value of 7.418 N/mm 2 , at a capacity of 6 kg shows a stress value of 9.272 N/mm 2 , and at a capacity of 8 kg shows a stress value 9.889 N/mm 2 . Based on the simulation results, the feed tank that will be made using plywood material is declared unsafe, so the authors made additives in the form of a mixture of polyester putty and hardener coated with resin to strengthen the hull, and increase the rigidity of the feed tank. The prototype test results have concluded that the tank is capable of carrying 8 kg of fish feed. Acknowledgments Authors would like to thank University Sebelas Maret, Indonesia for providing financial support through “Peningkatan Kapasitas Laboratorium Penelitian UNS ” (PKLP -UNS) 2020 grant with Contract No. 452/UN27.21/PN/2020.