侧向冲击下不锈钢方形钢管动力响应分析

ANALYSIS OF DYNAMIC RESPONSE OF STAINLESS-STEEL SQUARE TUBES UNDER LATERAL IMPACT

文中为研究侧向冲击下不锈钢方形钢管动力响应,建立两端简支的不锈钢方形钢管数值模型,与已有的冲击试验结果进行对比,验证了有限元模型的准确性。重点分析了冲击过程中钢管的能量吸收和应力变化状况,研究不同钢管壁厚、截面尺寸、冲击动量和冲击动能对不锈钢方形钢管动力响应的影响。结果表明冲击动能主要通过钢管的变形来耗散,随着钢管壁厚和截面尺寸的增加,跨中位移显著减小,钢管壁厚增加,冲击持续时间大幅增加,不锈钢方形钢管的抗冲击力学性能增强。冲击动量的改变对跨中位移的影响较小,冲击动量增加2916.54kg·m/s,跨中位移略微减小,冲击力持续时间增加0.076s。冲击动能增加2187.42J,跨中位移增加41.9%。研究为工程结构的设计和抗冲击性能的提高提供了重要的参考。

This paper investigates the dynamic response of stainless-steel square tubes under lateral impact.A nu⁃merical model of simply supported stainless steel square tubes is established and validated against existing impact testing results to ascertain the accuracy of the finite element model.The influence of wall thickness,section dimen⁃sions,impact momentum,and impact kinetic energy on the dynamic response of stainless-steel square tubes is inves⁃tigated in terms of energy absorption and stress variation in the tube during the impact process.The results indicate that the dissipation of impact kinetic energy primarily occurs within the tube deformation.With the increase of steel pipe wall thickness and cross-sectional size,the mid span displacement significantly decreases,the steel pipe wall thickness increases,and the impact duration significantly increases.The impact resistance mechanical performance of stainless-steel square steel pipes is enhanced.The change in impact momentum has a relatively small impact on mid span displacement,with an increase of 2916.54 kg·m/s in impact momentum and a slight decrease in mid span displacement.The duration of impact force increases by 0.076 seconds.The impact kinetic energy increased by 2187.42 J,and the mid span displacement increased by 41.9%.The research may provide the reference for the de⁃sign of engineering structures and the improvement of impact resistance performance.