Microscopic defects formation and dynamic mechanical response analysis of Q345 steel plate subjected to explosive load  

作　　者：Zhengqing Zhou Zechen Du Yulong Zhang Guili Yang Ruixiang Wang Yuzhe Liu Peize Zhang Yaxin Zhang Xiao Wang 

机构地区：[1]Research Institute of Macro-Safety Science,University of Science and Technology,Beijing,100083,China [2]School of Civil and Resource Engineering,University of Science and Technology,Beijing,100083,China [3]China North Industry Advanced Technology Generalization Institute,Beijing,100089,China [4]College of Field Engineering,PLA Army Engineering University,Nanjing,210007,China [5]School of Mechanical Engineering,Nantong University,Nantong,226019,China

出　　处：《Defence Technology（防务技术）》2024年第2期430-442,共13页Defence Technology

基　　金：Science and Technology Project of Fire Rescue Bureau of Ministry of Emergency Management(Grant No.2022XFZD05);S&T Program of Hebei(Grant No.22375419D);National Natural Science Foundation of China(Grant No.11802160).

摘　　要：As the basic protective element, steel plate had attracted world-wide attention because of frequent threats of explosive loads. This paper reports the relationships between microscopic defects of Q345 steel plate under the explosive load and its macroscopic dynamics simulation. Firstly, the defect characteristics of the steel plate were investigated by stereoscopic microscope(SM) and scanning electron microscope(SEM). At the macroscopic level, the defect was the formation of cave which was concentrated in the range of 0-3.0 cm from the explosion center, while at the microscopic level, the cavity and void formation were the typical damage characteristics. It also explains that the difference in defect morphology at different positions was the combining results of high temperature and high pressure. Secondly, the variation rules of mechanical properties of steel plate under explosive load were studied. The Arbitrary Lagrange-Euler(ALE) algorithm and multi-material fluid-structure coupling method were used to simulate the explosion process of steel plate. The accuracy of the method was verified by comparing the deformation of the simulation results with the experimental results, the pressure and stress at different positions on the surface of the steel plate were obtained. The simulation results indicated that the critical pressure causing the plate defects may be approximately 2.01 GPa. On this basis, it was found that the variation rules of surface pressure and microscopic defect area of the Q345 steel plate were strikingly similar, and the corresponding mathematical relationship between them was established. Compared with Monomolecular growth fitting models(MGFM) and Logistic fitting models(LFM), the relationship can be better expressed by cubic polynomial fitting model(CPFM). This paper illustrated that the explosive defect characteristics of metal plate at the microscopic level can be explored by analyzing its macroscopic dynamic mechanical response.

关 键 词：Explosive load Q345 steel Micro defect Finite element simulation Dynamic response Data fitting 

分 类 号：E95[军事—军事工程] TG142.1[一般工业技术—材料科学与工程]