Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations
Porous materials are widely used in the field of protection because of their excellent energy absorption characteristics. In this work, a series of polyurethane microscopic models are established and the effect of porosity on the shock waves is studied with classical molecular dynamics simulations....
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2024-01-01
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| Series: | Defence Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214914723000284 |
| _version_ | 1797334789398724608 |
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| author | Zhiqiang Hu Jianli Shao Shiyu Jia Weidong Song Cheng Wang |
| author_facet | Zhiqiang Hu Jianli Shao Shiyu Jia Weidong Song Cheng Wang |
| author_sort | Zhiqiang Hu |
| collection | DOAJ |
| description | Porous materials are widely used in the field of protection because of their excellent energy absorption characteristics. In this work, a series of polyurethane microscopic models are established and the effect of porosity on the shock waves is studied with classical molecular dynamics simulations. Firstly, shock Hugoniot relations for different porosities are obtained, which compare well with the experimental data. The pores collapse and form local stress wave, which results in the complex multi-wave structure of the shock wave. The microstructure analysis shows that the local stress increases and the local velocity decreases gradually during the process of pore collapse to complete compaction. Finally, it leads to stress relaxation and velocity homogenization. The shock stress peaks can be fitted with two exponential functions, and the amplitude of attenuation coefficient decreases with the increase of density. Besides, the pore collapse under shock or non-shock are discussed by the entropy increase rate of the system. The energy is dissipated mainly through the multiple interactions of the waves under shock. The energy is dissipated mainly by the friction between atoms under non-shock. |
| first_indexed | 2024-03-08T08:26:19Z |
| format | Article |
| id | doaj.art-3d446eb997ec4a259a0ad8ff200a2006 |
| institution | Directory Open Access Journal |
| issn | 2214-9147 |
| language | English |
| last_indexed | 2024-03-08T08:26:19Z |
| publishDate | 2024-01-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Defence Technology |
| spelling | doaj.art-3d446eb997ec4a259a0ad8ff200a20062024-02-02T04:39:10ZengKeAi Communications Co., Ltd.Defence Technology2214-91472024-01-0131117129Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic SimulationsZhiqiang Hu0Jianli Shao1Shiyu Jia2Weidong Song3Cheng Wang4State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaCorresponding author.; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaCorresponding author.; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaPorous materials are widely used in the field of protection because of their excellent energy absorption characteristics. In this work, a series of polyurethane microscopic models are established and the effect of porosity on the shock waves is studied with classical molecular dynamics simulations. Firstly, shock Hugoniot relations for different porosities are obtained, which compare well with the experimental data. The pores collapse and form local stress wave, which results in the complex multi-wave structure of the shock wave. The microstructure analysis shows that the local stress increases and the local velocity decreases gradually during the process of pore collapse to complete compaction. Finally, it leads to stress relaxation and velocity homogenization. The shock stress peaks can be fitted with two exponential functions, and the amplitude of attenuation coefficient decreases with the increase of density. Besides, the pore collapse under shock or non-shock are discussed by the entropy increase rate of the system. The energy is dissipated mainly through the multiple interactions of the waves under shock. The energy is dissipated mainly by the friction between atoms under non-shock.http://www.sciencedirect.com/science/article/pii/S2214914723000284Polyurethane foamShock waveAttenuationAtomistic simulation |
| spellingShingle | Zhiqiang Hu Jianli Shao Shiyu Jia Weidong Song Cheng Wang Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations Defence Technology Polyurethane foam Shock wave Attenuation Atomistic simulation |
| title | Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations |
| title_full | Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations |
| title_fullStr | Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations |
| title_full_unstemmed | Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations |
| title_short | Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations |
| title_sort | propagation properties of shock waves in polyurethane foam based on atomistic simulations |
| topic | Polyurethane foam Shock wave Attenuation Atomistic simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2214914723000284 |
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