A Numerical Analysis on Impacting Behavior of Spherical-cylinderical Shell Structure Connected by Bolts
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摘要: 为对螺栓数目和预紧力大小设计提供指导,对螺栓连接球柱壳结构抗撞击性能进行数值分析.数值分析时采用动力松弛法确定螺栓连接球柱壳结构的静态初始变形和初始应力,再通过动力分析获取结构在撞击载荷下的响应.计算得到的法兰面上的接触压力历程描述存在预紧的球壳和柱壳的接触运动,这种相对运动可引起螺栓预紧力的变化.测试点的应变响应描述了应力波的传播过程,反映了弹靶接触面和法兰接触面的压力变化.结果表明了螺栓连接球柱壳结构撞击行为数值分析方法的合理性.Abstract: To give helpful guidance in designing of number of bolt and magnitude of pre-tension force by numerical analysis on spherical-cylindrical shell structure connected by bolts subjected to impact loadings.The dynamic relaxation method is adopted to calculate initial displacement and initial stress of spherical-cylinderical shell structure.The dynamical response of the structure subjected to the impact loadings is then given.The contact movement between the spherical shell and cylinderical shell,being in pre-traction state,is described through historty of contact forces on flanges.The relative movement between them turned out the changes of pre-traction in the bolts.The history of strain at the given test points revealed the stress wave propagation whereas the contact forces on the projectile-target surface and flange surface are correlated.It is proved that the numerical method is reasonable on analyzing impacting behavior of spherical-cylindrical shell structure connected by bolts.
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[1] WHITTINGHAM B,MARSHALL I H,MITREVSKI T,et al.The response of composite structures with pre-stress subject tolow velocity impact damage[J].Composite Structures,2004,66(1/4):685-698.
[2] KHALILI S M R,MITTAL R K,PANAH N M.Analysis of fiber reinforced composite plates subjected to transverse impact inthe presence of initial stresses[J].Composite Structures,2007,77(2):263-268.
[3] PAPADRAKAKIS M.A method for the automated evaluation of the dynamic relaxation parameters[J].Computer Methods inApplied Mechanics and Engineering,1981,25(1):35-48.
[4] UNDERWOOD P.Dynamic relaxation in computational method for transient analysis[M].North Holland,Amsterdam:[s.l.],1983:245-263.
[5] DAVID R O,NORMAN F K.Adaptive dynamic relaxation algorithm for non-linear hyperelastic structures,Part I.formulation[J].Computer Methods in Applied Mechanics and Engineering,1995,126:67-89.
[6] SALEHI M,AGHHEI H.Dynamic relaxation large deflection analysis of non-axisymmetric circular viscoelastic plates[J].Computers&Structures,2005,83(23/24):1878-1890.
[7] HAN S,LEE K.A study of the stabilizing process of unstable structures by dynamic relaxation method[J].Computers&Structures,2003,81(17):1677-1688.
[8] 李士军,马大为,朱孙科.动力松弛方法中Rayleigh阻尼参数取值分析[J].计算力学学报,2010,27(1):169-172.LI Shi-jun,MA Da-wei,ZHU Sun-ke.Analysis of Rayleigh damp parameters in dynamic relaxation method[J].ChineseJournal of Computational Mechanics,2010,27(1):169-172.(in Chinese)
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