摘要
加筋圆柱壳的承压分析包含极限载荷和后屈曲变形,对这二者进行准确预报是加筋圆柱壳在建造完工后的重要一环。通过实测初挠度建立了反映加筋圆柱壳真实几何形状的有限元模型,在ABAQUS中使用弧长法获得了加筋圆柱壳在外部静水压作用下的极限载荷值,采用弧长与Dynamic/explicit相结合的途径模拟了加筋圆柱壳在外压作用下的后屈曲过程,并获得最终变形。通过与试验结果对比,得出上述数值方法准确可靠,计算结果更加符合客观实际,可以推广到工程应用中。
The load capacity analysis of the stiffened cylindrical shell contains ultimate loads and instability shapes,predicting both of them accurately after the stiffened cylindrical shell being built is therefore important.By actually measuring the initial deflection of the stiffened cylindrical shell,a finite element model featuring the real shape of the cylinder was established.Through this model,ultimate load of the stiffened cylindrical shell under the exterior pressure was obtained by using Riks method in ABAQUS.Further,the post-buckling path of the stiffened cylindrical shell was simulated by the combination of Riks method and Dynamic/explicit in ABAQUS and the final deformation of the cylindrical shell was figured out.The calculation results were compared with the experimental results,and a good agreement was observed,which proved that the present method is credible and reliable for numerical prediction of ultimate loads and instability shapes of the stiffened cylindrical shell with initial deflection under exterior pressure.
出处
《中国舰船研究》
2011年第6期13-16,共4页
Chinese Journal of Ship Research
基金
海军装备预研课题(101011001)
关键词
极限载荷
失稳形状
初挠度
弧长法
动态模拟
加强筋圆柱壳
ultimate load
instability shape
initial deflection
Riks method
dynamic simulation
stiffened cylindrical shell
