爆炸冲击波对伪随机网壳结构作用的超压分布研究
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摘要
采用AUTODYN软件,建立了爆炸冲击波与某140面体伪随机网壳结构相互作用的数值仿真模型,并对空中爆炸和地面爆炸的3种不同距离共6种工况下,网壳结构的特征表面超压作用过程进行了计算和分析。结果表明:与传统对称网壳结构相比,伪随机网壳在超压峰值分布规律和作用机制等方面都更为复杂,受到结构伪随机特性的影响,在相似位置表面,超压峰值也有明显差异;网壳底部迎爆面超压峰值与其他部位的相比,一般较高,而空爆条件下,超压峰值最大位置则可能转至网壳中部区域,网壳顶部和背面超压峰值相比其他部位的都较小;在网壳外架设防爆墙和加固网壳中部及底部结构,可提升伪随机网壳结构对冲击波的防护能力。
A numerical simulation model of the interaction between blast wave and a 140-face pseudorandom reticulated shell structure is established by using AUTODYN software. The process of overpressure acting on the characteristic surface of reticulated shell is calculated and analyzed under six operating conditions including air explosion and ground explosion. The results show that the pseudorandom reticulated shell is more complicated than the traditional symmetric reticulated shell in the distribution law and the action mechanism of the overpressure peak value,which is influenced by the pseudorandom characteristic of the structure,and the overpressure peak value also has obvious difference in the similar position surface. Compared with other parts, the peak value of overpressure at the bottom of the shell is generally higher,but under the condition of air explosion,the peak value of overpressure may shift to the middle part of the shell,and the peak value of overpressure at the top and back of the shell is smaller than that at other parts. Erecting blast wall outside the shell and strengthening the middle and bottom structure of the shell can improve the protection ability of pseudorandom shell against blast wave.
A numerical simulation model of the interaction between blast wave and a 140-face pseudorandom reticulated shell structure is established by using AUTODYN software. The process of overpressure acting on the characteristic surface of reticulated shell is calculated and analyzed under six operating conditions including air explosion and ground explosion. The results show that the pseudorandom reticulated shell is more complicated than the traditional symmetric reticulated shell in the distribution law and the action mechanism of the overpressure peak value,which is influenced by the pseudorandom characteristic of the structure,and the overpressure peak value also has obvious difference in the similar position surface. Compared with other parts, the peak value of overpressure at the bottom of the shell is generally higher,but under the condition of air explosion,the peak value of overpressure may shift to the middle part of the shell,and the peak value of overpressure at the top and back of the shell is smaller than that at other parts. Erecting blast wall outside the shell and strengthening the middle and bottom structure of the shell can improve the protection ability of pseudorandom shell against blast wave.
引文
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[2]杨帆,支旭东,范峰. K8型单层球面网壳基于AUTODYN的外爆响应分析[J].工程力学,2015,32(S1):202-208
[3]杨帆.单层球面网壳基于AUTODYN的外爆响应分析及CONWEP适用范围讨论[D].哈尔滨:哈尔滨工业大学,2014
[4] Hua Y,Akula P K,Gu L. Experimental and numerical investigation of carbon fiber sandwich panels subjected to blast loading[J]. Composites Part B:Engineering. 2014,56(1):456-463
[5] Hua Y,Akula P K,Gu L,et al. Experimental and numerical investigation of the mechanism of blast wave transmission through a surrogate head[J]. Journal of Computational and Nonlinear Dynamics. 2014,9(3):1010-1011
[6] Lee S,Lee H,Lee J,et al. Shock response analysis of blast hardened bulkhead in partial chamber model under internal blast[J]. Procedia Engineering. 2017,173(Supplement C):511-518
[7] Xiao W,Andrae M,Ruediger L,et al. Numerical prediction of blast wall effectiveness for structural protection against air blast[J]. Procedia Engineering. 2017,199(Supplement C):2519-2524
[8] Grisaro H Y,Dancygier A N. Spatial mass distribution of fragments striking a protective structure[J]. International Journal of Impact Engineering. 2018,112(Supplement C):1-14