目的 现有针对浅埋爆炸载荷及其防护结构的研究多集中于内陆环境,而对浅滩环境覆水工况下爆炸载荷特性及防护的研究尚不充分。同时,针对此类覆水浅埋爆炸载荷下夹芯板结构的研究也较为缺乏。为此本文重点探究蜂窝夹芯板在覆水浅埋爆炸载荷下的动态响应与抗爆性能,旨在为此类载荷作用下的防护结构设计提供参考。方法 采用经文献实验数据验证的数值仿真方法,分析覆水高度、边界条件、芯体结构参数对四方蜂窝夹芯板变形模式、能量吸收特性的影响,并对比不同芯体结构的防护性能。结果 覆水显著增强了浅埋爆炸载荷强度,部分覆水时载荷分布相对集中;完全覆水时载荷分布相对均匀。边界条件显著影响夹芯板变形模式。增加芯体高度可提升芯体压缩变形与吸能占比,降低后面板中点位移,部分覆水时,芯体高度=15 mm可使前面板位移最小;完全覆水时,芯体高度=20 mm可使前面板位移最小。部分覆水时存在最优芯体质量占比使面板位移最小;完全覆水时降低芯体占比、提高面板占比可增强结构抗爆性能。部分覆水时,前后面板厚度比为3:1时可使后面板中点位移最小,增加前面板厚度比会减少芯体及整体^l吸能;完全覆水时该比例改变对后面板位移及面板总吸能影响有限,前后面板厚度比为1:1时可使后面板中点位移最小。最优芯体结构取决于覆水工况：无覆水时四方蜂窝夹芯板抗爆性能最优;部分覆水时各结构性能相接近;完全覆水时波纹A夹芯板性能最优。结论 本研究分析了覆水浅埋爆炸工况下夹芯板的动态响应以及各设计因素的影响,可为特定工况下防爆结构设计提供参考。
Abstract
Current researches on shallow buried explosive loads and protective structures are predominantly concentrated on inland environments, while studies on blast load characteristics and protection under surface-covering water conditions in littoral zones remain insufficient. Furthermore, researches specifically addressing the response of lattice sandwich structures to such shallow-buried explosions with surface-covering water are relatively scarce. Therefore, the work aims to explore the dynamic response and anti-explosion performance of honeycomb sandwich panels under shallow buried explosive loads with surface-covering water, to provide a reference for the design of protective structures under such loads. Numerical simulation validated against literature data was employed to analyze the effects of surface-covering water height, boundary conditions, and sandwich structural parameters on the deformation patterns and energy absorption characteristics of square honeycomb sandwich panels, and the protective performance of different core configurations was compared. Surface-covering water significantly amplified the intensity of shallow buried loads. Under partial water coverage, the load distribution was highly concentrated. Under full water coverage, the load distribution was relatively uniform. Boundary conditions critically affected deformation patterns. Increasing core height enhanced core compressive deformation and energy absorption proportion while reducing mid-point displacement of back face sheet. Under partial water coverage, a core height of 15 mm minimized the displacement of the front face sheet. Under full water coverage, a core height of 20 mm minimized the displacement of the front face sheet. Under partial water coverage, an optimal core mass fraction minimized mid-point displacements of both face sheets. Under full water coverage, reducing core mass fraction while increasing face sheet mass fraction improved blast resistance. Under partial water coverage, if the front-to-back panel thickness ratio was 3:1, the mid-point displacement of the back face was minimized. Increasing front panel thickness proportion reduced core and total energy absorption. This ratio had limited effect on displacement of back face sheet and total face sheet energy absorption under full water coverage. If the front-to-back panel thickness ratio was 1:1, the mid-point displacement of the back face was minimized. Optimal core configuration depended on surface-covering water height and square honeycomb cores demonstrated superior blast resistance under no water coverage, all structures exhibited comparable performance under partial water coverage and corrugated A cores achieved optimal performance under full water coverage. This study analyzes the dynamic response of sandwich panels subject to shallow buried explosives with surface-covering water and investigate the effect of design parameters, offering guidance for the design of blast-resistant structures under specific operational conditions.
关键词
浅埋爆炸 /
表面覆水 /
蜂窝夹芯结构 /
抗爆性能
Key words
shallow buried explosives /
surface-covering water /
honeycomb sandwich structure /
blast resistance
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