Analysis on influence of grid density on element failure strain in penetration numerical simulation
ObjectivesIn order to solve the problem of numerical simulation of flat-nosed projectile penetration into metal plates, the influence of mesh size on element failure strain value and residual velocity of projectiles was studied. MethodsThe finite element software LS-DYNA was used to simulate the pro...
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| Format: | Article |
| Language: | English |
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Editorial Office of Chinese Journal of Ship Research
2023-02-01
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| Series: | Zhongguo Jianchuan Yanjiu |
| Subjects: | |
| Online Access: | http://www.ship-research.com/en/article/doi/10.19693/j.issn.1673-3185.02519 |
| _version_ | 1797871304211169280 |
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| author | Benting ZHU Guomin WU |
| author_facet | Benting ZHU Guomin WU |
| author_sort | Benting ZHU |
| collection | DOAJ |
| description | ObjectivesIn order to solve the problem of numerical simulation of flat-nosed projectile penetration into metal plates, the influence of mesh size on element failure strain value and residual velocity of projectiles was studied. MethodsThe finite element software LS-DYNA was used to simulate the process of uniaxial tensile test of Q235 steel sample, and the failure strain of the element under the grid density is obtained by the elongation of the tensile sample during fracture. In the meantime, the correction curve of the failure strain with the grid density was plotted and dynamically corrected. Then, the numerical simulation of flat-nosed projectile penetrating Q235 steel plate was carried out with the target plate meshed with different sizes. The failure strain of Q235 steel material was selected according to the correction curve. Finally, the residual velocity of the projectile is compared with the experimental results to analyze the influence of mesh size on the simulation results of the penetration resistance problem of the metal plate in the numerical simulation.ResultsThe results show that the element failure strain selected in the numerical simulation should increase with the increase in grid density, and in the case of the metal plate anti-penetration problem, it should increase with the increase of the grid density. In the problem of penetration resistance of metal plates, the simulation results of residual velocity prediction gradually converge with the experimental results. With the increase of mesh density, when the grid size is 0.5 mm, the average relative error of the numerical simulation and the test fitting curve in the velocity section is 5.13%, and the error between the numerical simulation and the test is larger in the low-speed section. Moreover, the residual velocity of the projectile body is more sensitive to mesh density in the low velocity range.ConclusionsThe related calculation methods and research results have a certain reference value for the selection of mesh size and material failure strain in the projectile penetration problem. |
| first_indexed | 2024-04-10T00:41:49Z |
| format | Article |
| id | doaj.art-6b612ae3e8bf44bbbe12dc30f28e9d5a |
| institution | Directory Open Access Journal |
| issn | 1673-3185 |
| language | English |
| last_indexed | 2024-04-10T00:41:49Z |
| publishDate | 2023-02-01 |
| publisher | Editorial Office of Chinese Journal of Ship Research |
| record_format | Article |
| series | Zhongguo Jianchuan Yanjiu |
| spelling | doaj.art-6b612ae3e8bf44bbbe12dc30f28e9d5a2023-03-14T05:44:46ZengEditorial Office of Chinese Journal of Ship ResearchZhongguo Jianchuan Yanjiu1673-31852023-02-0118119920410.19693/j.issn.1673-3185.02519ZG2519Analysis on influence of grid density on element failure strain in penetration numerical simulationBenting ZHU0Guomin WU1China Ship Development and Design Center, Wuhan 430064, ChinaChina Ship Development and Design Center, Wuhan 430064, ChinaObjectivesIn order to solve the problem of numerical simulation of flat-nosed projectile penetration into metal plates, the influence of mesh size on element failure strain value and residual velocity of projectiles was studied. MethodsThe finite element software LS-DYNA was used to simulate the process of uniaxial tensile test of Q235 steel sample, and the failure strain of the element under the grid density is obtained by the elongation of the tensile sample during fracture. In the meantime, the correction curve of the failure strain with the grid density was plotted and dynamically corrected. Then, the numerical simulation of flat-nosed projectile penetrating Q235 steel plate was carried out with the target plate meshed with different sizes. The failure strain of Q235 steel material was selected according to the correction curve. Finally, the residual velocity of the projectile is compared with the experimental results to analyze the influence of mesh size on the simulation results of the penetration resistance problem of the metal plate in the numerical simulation.ResultsThe results show that the element failure strain selected in the numerical simulation should increase with the increase in grid density, and in the case of the metal plate anti-penetration problem, it should increase with the increase of the grid density. In the problem of penetration resistance of metal plates, the simulation results of residual velocity prediction gradually converge with the experimental results. With the increase of mesh density, when the grid size is 0.5 mm, the average relative error of the numerical simulation and the test fitting curve in the velocity section is 5.13%, and the error between the numerical simulation and the test is larger in the low-speed section. Moreover, the residual velocity of the projectile body is more sensitive to mesh density in the low velocity range.ConclusionsThe related calculation methods and research results have a certain reference value for the selection of mesh size and material failure strain in the projectile penetration problem.http://www.ship-research.com/en/article/doi/10.19693/j.issn.1673-3185.02519penetrationgrid densityfailure strainnumerical simulation |
| spellingShingle | Benting ZHU Guomin WU Analysis on influence of grid density on element failure strain in penetration numerical simulation Zhongguo Jianchuan Yanjiu penetration grid density failure strain numerical simulation |
| title | Analysis on influence of grid density on element failure strain in penetration numerical simulation |
| title_full | Analysis on influence of grid density on element failure strain in penetration numerical simulation |
| title_fullStr | Analysis on influence of grid density on element failure strain in penetration numerical simulation |
| title_full_unstemmed | Analysis on influence of grid density on element failure strain in penetration numerical simulation |
| title_short | Analysis on influence of grid density on element failure strain in penetration numerical simulation |
| title_sort | analysis on influence of grid density on element failure strain in penetration numerical simulation |
| topic | penetration grid density failure strain numerical simulation |
| url | http://www.ship-research.com/en/article/doi/10.19693/j.issn.1673-3185.02519 |
| work_keys_str_mv | AT bentingzhu analysisoninfluenceofgriddensityonelementfailurestraininpenetrationnumericalsimulation AT guominwu analysisoninfluenceofgriddensityonelementfailurestraininpenetrationnumericalsimulation |