爆炸荷载下Q345B钢圆管结构的损伤特性研究

Study on Damage Effect of Q345B Steel Pipe Subjected to Blast Load

将壁厚为5 mm、6 mm,外径为114 mm的Q345B钢圆管放置在500 g TNT药柱下进行爆炸冲击实验,结果表明,比例距离与壁厚较小时圆管结构的损伤变形程度加剧。基于动力有限元程序LS-DYNA及Arbitrary Lagrangian-Eulerian流固耦合算法,对圆管的非线性动力响应过程进行数值模拟,分析了结构屈曲变形过程及位移曲线等,计算结果与实验基本吻合。研究结论可为Q345B钢圆管结构抗爆性能评估及抗爆技术设计提供科学依据。

The damage effect of Q345B steel pipe under lateral blast load was studied by experiment and numerical simulation.The steel pipe with wall thickness of 5mm and 6mm,outer diameter of 114mm was placed in explosion field of the 500 g TNT for explosive impact tests,and the deformation and damage characteristics of steel pipe were obtained.The experimental results show that the damage and deformation of the pipe are aggravated when the scale distance and wall thickness are relatively small.Based on dynamic finite element program LS-DYNA and Arbitrary Lagran gian-Eulerian fluid-solid coupling algorithm,the nonlinear dynamic response process of the pipes were numerically simulated and the buckling deformation process and displacement time-history curve of the structure were analyzed,the results of which were basically in agreement with the experimental results.The conclusion of the study can provide scientific basis for evaluating the blast resistant performance of Q345B steel pipe as well as the design of blast resistant technology.