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| Propagating Characterization of Shock Wave in the MesoscopicStructure of Cellular Materials |
| Received:March 24, 2021 Revised:April 15, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.05.013 |
| KeyWord:cellular materials Voronoi mesoscopic structure local strain gradient method shock wave front mechanism |
| Author | Institution |
| LI Wei |
Institute of System Engineering, CAEP, Mianyang , China |
| WANG Peng |
Institute of System Engineering, CAEP, Mianyang , China |
| LI Jia |
Institute of System Engineering, CAEP, Mianyang , China |
| LUO Jing-run |
Institute of System Engineering, CAEP, Mianyang , China |
| LI Ming-hai |
Institute of System Engineering, CAEP, Mianyang , China |
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| Abstract: |
| The paper aims to obtain the wave propagation law of mesoscopic cellular materials in the safety protection structure under high-speed impact.In this paper, using numerical simulation based on 3D-Voronoi mesoscopic structure and local strain gradient method based on least square method, the propagation law of shock wave front of mesoscopic structure under high-speed impact is studied. Through the displacement field data extracted by the numerical simulation of the mesoscopic structure, combined with the local strain gradient method based on least square method, the shock wave front with clear interface is obtained. The shock end and the support end induce right and left shock wave fronts respectively. The shock wave front propagation is divided into three stages, namely, the stage of shock wave induced by shock end to the right, the stage of shock wave induced by support end to the left and the uncompressed area moving rigidly to the right, and the stage of right shock wave compressed area and uncompressed area moving rigidly to the right. Through the study of the evolution law of shock wave velocity, the Lagrangian position and Lagrangian wave velocity of the right and left shock wave fronts are obtained respectively, and the conclusion that the right-traveling shock wave front has a constant deceleration is explained through rigorous theoretical derivation. Finally, the rationality of the division of shock wave front is verified. Numerical simulation based on 3D-Voronoi mesoscopic structure and local strain gradient method based on least square method can obtained a clear shock wave front at the interface, and the shock wave front propagation law of mesoscopic cellular material structure under high-speed impact can provide a reference basis for the safety design and research of the protection structures. |
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