钢箱计算失效应变的冲击试验

Impact Test on Computational Failure Strain of Steel Boxes

为研究船桥碰撞有限元分析中钢板的网格尺寸与钢材计算失效应变之间的关系,进行了3个钢箱模型的落锤冲击试验。采用LS-DYNA软件对试验模型进行了有限元建模和碰撞计算,并与试验结果进行了对比。定义了一个相关系数来反映试验结果与计算结果之间的相关性,并据此定义了与网格尺寸相关的计算失效应变合理取值区间。研究结果表明:为得到合理精度的计算结果,钢板的计算失效应变的取值应随钢板网格尺寸变化,使用大的网格尺寸时应采用小的失效应变,使用小的网格尺寸时应采用大的失效应变;将计算失效应变合理取值区间与自适应网格剖分技术结合,可以在保证计算精度的同时,提高计算效率。

In order to investigate the relations between the meshing size of steel plates and computational failure strain of steel in ship-bridge collision finite element analysis , the drop hammer impact tests of three steel boxes were carried out .The finite element model was built and impact computation was conducted for test models using LS-DYNA software , and the computational results were compared with the test results .A correlation coefficient was defined to obtain a reasonable failure strain interval related to the meshing size of the steel boxes .The research results show that in order to get reasonable computational accurcy , the values of computational failure strain should vary with the meshing size of steel plates .The larger failure strain should be used for the smaller meshing size ,and the smaller failure strain should be used for the larger meshing size . The computational accuracy and computational efficiency can be obtained at the same time through combining the reasonable computational failure strain interval and the adaptive meshing technology .