Dynamic response and damage analysis of steel box wall under internal blast loading

Duo Zhang,Yuqing Ding,Shujian Yao,Fangyun Lu,Jiangjie Song

doi:10.1177/1687814018822601

Abstract

Different loading conditions, different structural dimensions, or different structural materials will lead to different damage results. In this study, blast experiment of steel box model under internal explosion was conducted and the numerical methods are validated through comparison of experimental and numerical results. Then, a series of multi-box models were built, and a large number of numerical simulations considering two kinds of steel, different plate thickness ranging from 0.005 to 0.025 m, and different TNT explosive mass ranging from 5 to 2000 kg were carried out using the validated numerical methods. Two damage modes, convex damage and concave damage, were observed. The dynamic response and damage mechanism were analyzed, and the results show that the different damage modes of the first wall will lead to different damage results of the second wall. Through dimensional analysis, a two-dimensional dimensionless number for internal blast analysis was suggested. Clear physical meanings are conveyed in the dimensionless number. After that, prediction of the damage modes was studied using the proposed dimensionless number. A damage mode map was plotted based on the two-dimensional dimensionless number, and an empirical equation for rapid prediction of damage mode of steel box wall under internal blast loading is proposed.

Highlights

Steel box is the basic component of many structures, such as vans, trains, and ships
More than 100 three-dimensional numerical simulations of multiple steel boxes under internal blast loading are conducted
By analyzing the results of simulations and experiments, we found that the damage modes of box wall under internal blast loads are influenced by many factors, such as the amount of explosive, and the strength and dimension of the structure

Summary

Introduction

Steel box is the basic component of many structures, such as vans, trains, and ships. Dong et al.[4] studied the interactive mechanisms between internal blast loading and the dynamic elastic response of spherical containment vessels. Numerical simulation, using finite element method programs, has become a common tool in the field of blast impaction because of its advantage of being able to calculate problems with large deflections and high strains.[9,10,11] Wang[12] analyzed the dynamic response of a rectangular steel tube subjected to internal explosion using the finite element software BlastX and LSDYNA. Kakogiannis et al.[15] developed the multi-scale numerical modeling method to predict the dynamic response of Ti-6Al-4 V sheets under blast loading and validated the method with experiments. Blast experiment of steel box model under internal explosion was conducted and the numerical methods are validated.

Experimental setup

Concluding remarks