CHINESE JOURNAL OF ENERGETIC MATERIALS
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爆炸荷载下背爆面柔性聚脲防护混凝土靶板的反直观行为
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作者单位:

1.中国工程物理研究院化工材料研究所, 四川 绵阳 621999;2.青岛理工大学土木工程学院, 山东 青岛 266520;3.青岛沙木新材料有限公司, 山东 青岛 266108

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国家重点研发计划(2022YFC3320504)


Counter-Intuitive Behavior of Flexible Polyurea-Protected Concrete Target Plate on Back Blast Surface under Blast Load
Author:
Affiliation:

1.Institute of Chemical Materials, CAEP, Mianyang 621999, China;2.School of Civil Engineering, Qingdao University of Technology, Qingdao 266525, China;3.Qingdao Shamu Advanced Material Co., Ltd., Qingdao 266108, China

Fund Project:

Grant support: National Key Research and Development Program of China (No. 2022YFC3320504)

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    摘要:

    金属结构在冲击载荷作用下,最终的变形方向与加载的方向相反,这一现象被称为反直观行为,试验发现背爆面柔性聚脲防护混凝土靶板在75 g TNT爆炸荷载下也发生了反直观行为。为了研究背爆面柔性聚脲防护混凝土靶板在爆炸荷载下的反直观行为,采用ANSYS/LSDYNA有限元软件,建立了背爆面柔性聚脲防护混凝土靶板在爆炸荷载作用下的有限元模型。利用有限元模型分析背爆面柔性聚脲防护混凝土靶板的动态响应规律,从能量的角度研究靶板反直观行为的发生机理。以靶板的中心点位移和挠度为指标,参数化分析了炸药药量和聚脲涂层厚度对靶板反直观行为的影响规律。结果表明:靶板的反直观行为是由聚脲涂层的应变能释放、混凝土损伤破坏的能量耗散及两种材料间能量的相互转化这三种因素共同作用导致的;炸药药量是反直观行为能否发生的关键因素,当药量较低或较高时,靶板都无法发生反直观行为;涂层厚度在2~8 mm范围内,靶板均出现了反直观行为,其弯曲程度随着涂层厚度的增加先增大后减小。

    Abstract:

    The final deformation of a metal structure under impulsive load occurring in the direction opposite to that of loading, which is a phenomenon known as counter-intuitive behavior. It was found that the flexible polyurea-protected concrete target plate on the back blast surface also experienced counter-intuitive behavior under 75 g TNT blast load. To investigate the counter-intuitive behavior of the flexible polyurea-protected concrete target plate on the back blast surface under blast load, a finite element model of the back blast surface of the flexible polyurea-protected concrete target plate subjected to blast load was developed using the ANSYS/LS-DYNA finite element software. The finite element model was utilized to analyze the dynamic response regularity of the flexible polyurea sheltered concrete target plate on the back blast surface, and to study the occurrence mechanism of the target plate''s counter-intuitive behavior from the perspective of energy. Taking the center point displacement and deflection of the concrete target plate as indexes, the influence of the amount of explosive charge and coating thickness of polyurea on the counter-intuitive behavior of the target plate was analyzed parametrically. The results demonstrate that the counter-intuitive behavior of target plate is attributed to strain energy release from the polyurea coating, energy dissipation from concrete damage, and mutual transformation of energy between both materials. Furthermore, it is found that explosive charge mass is the dominant factor affecting counter-intuitive behavior. The concrete target plate is unable to undergo counter-intuitive behavior when either the charge mass was too small or too large. Within a range of coating thicknesses from 2 mm to 8 mm, an initial increase followed by subsequent decline in bending degree was observed for the target plate exhibiting counter-intuitive behavior.

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引用本文

徐昊,张锐,黄微波,等.爆炸荷载下背爆面柔性聚脲防护混凝土靶板的反直观行为[J].含能材料, 2024, 32(9):887-898. DOI:10.11943/CJEM2024144.
XU Hao, ZHANG Rui, HUANG Wei-bo, et al. Counter-Intuitive Behavior of Flexible Polyurea-Protected Concrete Target Plate on Back Blast Surface under Blast Load[J]. Chinese Journal of Energetic Materials, 2024, 32(9):887-898. DOI:10.11943/CJEM2024144.

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  • 收稿日期: 2024-06-07
  • 最后修改日期: 2024-09-13
  • 录用日期: 2024-09-05
  • 在线发布日期: 2024-09-12
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