摘要
采用有限元软件针对大型复杂舰船在战略武器大当量爆炸冲击波作用下的毁伤效应进行数值模拟研究.建立某航母结构1∶1有限元模型,采用CONWEP方法施加爆炸载荷,研究舰船的动态响应特征,主要分析爆炸当量、冲击波强度等因素对舰船毁伤模式和甲板变形破坏等级的影响.研究结果表明,随着爆炸冲击波传播距离增加,其强度沿飞行甲板表面以指数形式衰减,沿不同层甲板则呈现近似线性衰减特征.随着爆炸当量和冲击波强度的增加,舰船甲板变形破坏等级逐渐增加,舰船毁伤模式由局部塑性变形毁伤逐渐转变为总纵强度毁伤模式,接触爆炸时还会发生结构破损总纵剩余强度毁伤.在小当量爆炸且冲击波强度超过1.0 MPa时,飞行甲板、吊舱甲板和机库甲板会随着冲击波超压强度的增加而逐渐失效;在中等当量且冲击波超压强度超过0.2 MPa时,飞行甲板、吊舱甲板在爆炸后基本失效,机库甲板的功能将受到严重影响;在大当量爆炸且冲击波超压强度达到0.2 MPa时,三层甲板均发生局部区域完全失效.相关研究方法有助于大型复杂舰船结构在大当量爆炸冲击波作用下的毁伤效应评估.
The destructive effect of high blast load from strategic arms on the large complex warship structure was investigated based on the finite element method(FEM)simulations.Firstly,an actual geometrical model of an aircraft carrier structure was established,and the blast load was loaded through CONWEP method.And then,the dynamic response of warship structure was analyzed in detail,and the effects of several main factors were emphasized,including explosive equivalent and shock wave intensity,etc.,on the damage mode of warship structure as well as the damage grade of deck.The results show that as the propagation distance of shock wave increases,the shock wave intensity decays exponentially along the flight deck surface,and it decays approxim-ately linearly along different decks.Besides,with increasing the explosion equivalent and the shock wave intens-ity,the deformation or damage in the deck increases gradually,and the damage mode of warship structure changes from local plastic deformation to longitudinal strength mode,even the longitudinal residual strength mode would occur in the case of contact explosion.Moreover,in the condition of low explosion equivalent com-bined with shock wave intensity greater than 1.0 MPa,the flight deck,pod deck and hangar deck will fail gradu-ally with the increase of shock wave intensity.In the case of medium explosion equivalent combined with shock wave intensity greater than 0.2 MPa,the flight deck and pod deck almost fail completely,and the function of hangar deck can be severely degraded.Comparatively,under the large explosion equivalent with shock wave in-tensity greater than 0.2 MPa,complete failure within local region will occur in all the three kinds of deck.Re-lated investigation approach is beneficial to the damage evaluation of large complex warship structure under the high blast load in the engineering application.
作者
陈建良
李继承
屈明
李上明
颜怡霞
邓志方
CHEN Jianiang;LI Jicheng;QU Ming;LI Shangming;YAN Yixia;DENG Zhifang(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang,Sichuan 621999,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang,Sichuan 621999,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2023年第11期1176-1186,共11页
Transactions of Beijing Institute of Technology
基金
四川省自然科学基金杰出青年科学基金项目(2023NSFSC1913)
中国工程物理研究院总体工程研究所“应用基础加强计划”项目(ISEJCJQ22-004)。
关键词
大型复杂舰船结构
爆炸当量
冲击波强度
毁伤模式
变形破坏等级
large complex warship structure
explosion equivalent
shock wave intensity
damage mode
de-formation and damage grade
