Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 54 8 2022 10 23 Simulation and Analysis of the First to Fourth Types of Compressed Natural Gas Tanks of Vehicles under the Explosive Loading Simulation and Analysis of the First to Fourth Types of Compressed Natural Gas Tanks of Vehicles under the Explosive Loading 1895 1916 4878 10.22060/mej.2022.20911.7335 FA Alireza Albooyeh Mechanical Engineering, Damghan University, Damghan, Iran Shahram Amirabdollahian Faculty of Mechanical and Mechatronics Engineering, Shahrood University of Technology, Shahroud, Iran Nima Fatahi School of Engineering, Damghan University, Damghan, Iran Journal Article 2021 12 23 In the current research, the behavior of the first to fourth types of compressed natural gas tanks of the vehicle under internal pressure and the external explosive load was investigated in the ABAQUS finite element software. At first, the hydrostatic pressure of about 200 bar was applied to ensure that these tanks do not fail under internal pressure, and the failure index of these tanks was evaluated using the Tsai-Hill criterion. Then, the CONWEP model was used to investigate the behavior of tanks under external explosive load. For this purpose, Trinitrotoluene material was applied in two explosion points (near and far) and three different explosion charge values. In the explosion simulation, the amount of damage to the metal and composite parts of the tanks was evaluated using the Johnson-Cook and Hashin criteria, respectively. The results of this research show that the fourth type of tank has the highest strength against internal hydrostatic pressure compared to other tanks and can withstand up to 610 bar pressure. In addition, the third type of tank has the highest safety against external explosion waves. A comparison of the results related to the second to fourth type composite tanks shows that the presence of steel liner under the composite layer has a significant effect on the strength of the tank against impact or explosion. Another important result obtained is that the first type of tank despite the high weight has good resistance to internal pressure as well as an explosive wave. In the current research, the behavior of the first to fourth types of compressed natural gas tanks of the vehicle under internal pressure and the external explosive load was investigated in the ABAQUS finite element software. At first, the hydrostatic pressure of about 200 bar was applied to ensure that these tanks do not fail under internal pressure, and the failure index of these tanks was evaluated using the Tsai-Hill criterion. Then, the CONWEP model was used to investigate the behavior of tanks under external explosive load. For this purpose, Trinitrotoluene material was applied in two explosion points (near and far) and three different explosion charge values. In the explosion simulation, the amount of damage to the metal and composite parts of the tanks was evaluated using the Johnson-Cook and Hashin criteria, respectively. The results of this research show that the fourth type of tank has the highest strength against internal hydrostatic pressure compared to other tanks and can withstand up to 610 bar pressure. In addition, the third type of tank has the highest safety against external explosion waves. A comparison of the results related to the second to fourth type composite tanks shows that the presence of steel liner under the composite layer has a significant effect on the strength of the tank against impact or explosion. Another important result obtained is that the first type of tank despite the high weight has good resistance to internal pressure as well as an explosive wave. https://mej.aut.ac.ir/article_4878_aa108f56a10e75c1f20f27723ecac85f.pdf