全接液金属浮盘抗爆特性实验与数值模拟

Experiment and numerical simulation on explosion resistance of full-contact metal floating decks

【目的】为了研究气体爆炸载荷下全接液金属浮盘的抗爆性能,采用实验研究与数值模拟相结合的方法对全接液金属浮盘的抗爆性能进行探究。【方法】通过浮盘抗爆实验装置对不同类型的浮盘试件进行抗爆特性实验,分析浮盘材料、连接类型、面板厚度对其抗爆性能的影响,并根据实验数据建立有限元模型,通过对比浮盘抗爆特性实验与数值模拟的结果,验证了有限元模型的正确性。在此基础上,基于浮盘的位移及应力云图、中心点变形与位移速度随时间变化曲线、蜂窝芯吸能比数据,分析了浮盘的动态响应过程与失效模式。【结果】在应力分布特征上,浮盘上面板所受应力沿半径方向呈单调递增的变化趋势,边缘处应力最大,为98.1 MPa;下面板所受应力整体小于上面板,沿半径方向呈先增大、再减小、最后再增大的分布趋势,最大应力出现在浮盘的边缘位置,为63.18 MPa;浮盘上、下面板的最大变形分别为48.9 mm、3.2 mm,在抗爆过程中蜂窝芯吸收了72%~86%的冲击能量。【结论】浮盘上面板中心位置为整体结构的薄弱区域,为达到更好的抗爆性能,需要对上面板进行适当的加强;在相同规格及条件下,蜂窝填充浮盘具有更好的抗爆性能。

[Objective]This paper aims to explore the explosion resistance performance of full-contact metal floating decks under gas explosion loads by employing a combination of experimental and numerical simulation methods.[Methods]In this study,a series of experiments were performed using various types of floating deck specimens in an explosion resistance experimental system designed for floating decks,to investigate the impact of different floating deck materials,connection modes,and thickness of upper and lower panels on their explosion resistance performance.A finite element model was established using the experimental data,and its correctness was subsequently verified by comparing the results obtained from the experiments with those obtained through numerical simulation.Furthermore,this study focused on analyzing the dynamic response process and failure mode of floating decks by studying displacement and stress contours,deformation-velocity curves at the center point over time,and examining the energy absorption ratio data of the honeycomb core.[Results]The study results revealed that the upper panel of the floating decks exhibited a radial stress distribution with a monotonically increasing trend,reaching the maximum value of 98.1 MPa at the edge.In contrast,the lower panel experienced relatively lower stress levels compared to the upper panel,displaying a radial distribution trend characterized by an initial increase,followed by a decrease in the middle,and another increase towards the end.The maximum stress observed on the lower panel was 63.18 MPa at the edge.Additionally,the maximum deformation observed on the floating decks was 48.9 mm for the upper panel and 3.2 mm for the lower panel,respectively.During the process of withstanding the explosion,the middle honeycomb core absorbed 72%-86%of the impact energy.[Conclusion]The central zone of the upper panel in floating decks is identified as a weak area in the overall structure.To enhance the explosion resistance performance,it is crucial to strengthen the upper panel appropriately.Additionally,under the same specifications and conditions,floating decks filled with honeycomb cores exhibit improved performance in explosion resistance.