舱内爆炸载荷下箱型梁船体节点结构强度分析
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摘要
[目的]为了研究箱型梁典型节点结构在舱内爆炸下的结构强度,[方法]基于ANSYS/LS-DYNA显式动力有限元软件,首先建立箱型梁船体舱段结构的有限元模型。然后,采用ALE算法开展舱内爆炸载荷下舷侧箱型梁与强横梁连接处不同型式节点结构的动态响应数值计算。最后,在给定的炸药当量和爆点位置情况下,获得舱室结构的整体变形和破坏模式,并分析在不同节点结构设计方案下典型位置的应力特征。[结果]计算结果表明:舷侧箱型梁与强横梁连接处圆弧式和肘板式节点结构的应力峰值与甲板破口尺寸基本相当;从舱壁撕裂长度来看,肘板式稍逊于圆弧式,在中间箱型梁与强横梁连接处,圆弧连接最优,单侧肘板次之,双侧肘板最差。[结论]所得到的数值计算结果可为箱型梁节点连接结构的工程应用提供有益的参考。
[Objectives]In order to investigate the strength of the joint structure of box girders underinternal explosion,[Methods]this paper use the explicit dynamic finite software ANSYS/LS-DYNA toestablish a large complex typical cabin model. Numerical investigations are then conducted to analyze thedynamic response of different forms of joint structure under internal explosion using the ALE algorithm.The whole deformation/failure mode of cabin structures with the same charge mass and detonation positionis obtained. A comparison of stress level at typical positions is then carried out in detail.[Results]Theresults show that the arc-arc type joint has a lower stress level compared to the bracket at the broadside. Inthe central position where a box girder is connected to a web beam,the arc-arc joint form is better than theother two. [Conclusions]The findings of this paper can provide useful references for the engineeringapplication of joint structures.
[Objectives]In order to investigate the strength of the joint structure of box girders underinternal explosion,[Methods]this paper use the explicit dynamic finite software ANSYS/LS-DYNA toestablish a large complex typical cabin model. Numerical investigations are then conducted to analyze thedynamic response of different forms of joint structure under internal explosion using the ALE algorithm.The whole deformation/failure mode of cabin structures with the same charge mass and detonation positionis obtained. A comparison of stress level at typical positions is then carried out in detail.[Results]Theresults show that the arc-arc type joint has a lower stress level compared to the bracket at the broadside. Inthe central position where a box girder is connected to a web beam,the arc-arc joint form is better than theother two. [Conclusions]The findings of this paper can provide useful references for the engineeringapplication of joint structures.
引文
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[2]李伟,朱锡,梅志远,等.战斗部舱内爆炸对舱室结构毁伤的实验研究[J].舰船科学技术,2009,31(3):34-37.LI W,ZHU X,MEI Z Y,et al.Experimental studies on damage effect of missile warhead on cabins structure under internal explosion[J].Ship Science and Technology,2009,31(3):34-37(in Chinese).
[3]樊壮卿,王伟力,黄雪峰,等.典型舱室内爆炸仿真分析[J].工程爆破,2015,21(3):13-17.FAN Z Q,WANG W L,HUANG X F,et al.Simulation analysis on typical cabin internal explosion[J].Engineering Blasting,2015,21(3):13-17(in Chinese).
[4]侯海量,朱锡,李伟,等.舱内爆炸冲击载荷特性实验研究[J].船舶力学,2010,14(8):901-907.HOU H L,ZHU X,LI W,et al.Experimental studies on characteristics of blast loading when exploded inside ship cabin[J].Journal of Ship Mechanics,2010,14(8):901-907(in Chinese).
[5]侯海量,朱锡,梅志远.舱内爆炸载荷及舱室板架结构的失效模式分析[J].爆炸与冲击,2007,27(2):151-158.HOU H L,ZHU X,MEI Z Y.Study on the blast load and failure mode of ship structure subject to internal explosion[J].Explosion and Shock Waves,2007,27(2):151-158(in Chinese).
[6]陈攀,刘志忠.舱室内爆冲击波载荷特性及影响因素分析[J].舰船科学技术,2016,38(2):43-48.CHEN P,LIU Z Z.Research on loading of explosive and influencing factors inside closed cabin[J].Ship Science and Technology,2016,38(2):43-48(in Chinese).
[7]刘慧泉.箱型梁舱段结构设计及舱内爆炸数值分析[D].上海:上海交通大学,2012.
[8]孔祥韶,吴卫国,李俊,等.角隅结构对舱内爆炸载荷影响的实验研究[J].中国造船,2012,53(3):40-50.KONG X S,WU W G,LI J,et al.Experimental research of influence of corner structure on blast loading under inner explosion[J].Shipbuilding of China,2012,53(3):40-50(in Chinese).
[9]孔祥韶,吴卫国,李晓彬,等.舰船舱室内部爆炸的数值模拟研究[J].中国舰船研究,2009,4(4):7-11.KONG X S,WU W G,LI X B,et al.Numerical simulation of cabin structure under inner explosion[J].Chinese Journal of Ship Research,2009,4(4):7-11(in Chinese).