Combining field tests and numerical simulations, influences of initial conditions on damage and failure effect of steel square tubes under lateral local explosion loading were studied. Q235 steel square tubes with 3 kinds of wall thickness including 3mm, 3.5mm and 4mm and each cross-section width of 100mm were set in an explosion field produced by 160g TNT explosive to conduct impact tests. Influences of charge’s scaled distance Z and width-thickness ratio W of square tube on important damage deformation feature parameters, such as, center deflection of tube’s exploding surface, radial width and axial length of depression deformation zone etc. were analyzed. Numerical simulations for deformation and failure process of square tubes were done with the dynamic finite element program LS-DYNA and the fluid-solid coupled algorithm. The calculated results agreed well with test phenomena. Based on strain-time curves of tube’s key nodes, deformation’s different stages of tube exploding surface’s center point and right vertex of tube’s cross-section were analyzed. The study provided an important scientific basis for structural design and engineering protection calculation of steel square tubes.
Key words
blast loading /
steel square tube /
damage and failure /
deformation form /
numerical simulation
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] Gregory Szuladzinski，Plasticity of Steel under Explosive Loading and the Effect on Cylindrical Shell Fragmentation [J]. Key Engineering Materials，2002，Vol.457 (233)，pp.187-192.
[2] Li，L-J，Jiang，W-K，Ai，Y-H. Experimental study on deformation and shock damage of cylindrical shell structures subjected to underwater explosion [J]. Proceedings of the Institution of Mechanical Engineers，2010，Vol.224 (C11) ， pp.2505-2514.
[3] R. Rajabiehfard, A. Darvizeh, M. Darvizeh, et al. Theoretical and experimental analysis of elastic–plastic cylindrical shells under two types of axial impacts, Thin-Walled Struct.107 (2016)315-326.
[4] J. Wu, C Ji, Y Long, et al. Dynamic responses and damage of cylindrical shells under the combined effects of fragments and shock waves, Thin-Walled Struct. 113 (2017) 94–103.
[5] Jones N. Structural impact [M]. Cambridge，UK: Cambridge University Press，1997．
[6] Wegener R B. Martin J B. Predictions of permanent deformation of impulsively loaded simply supported square tubes steel beams [J]. International Journal of Mechanical Science，1985，27（1/2）：55-69.
[7] Bambach M R. Behaviour and design of aluminium hollow sections subjected to transverse blast loads [J]. Thin-Walled Structures，2008，46：1370-1381.
[8] Jama H H，Nurick G N，Bambach M R. Steel square hollow sections subjected to transverse blast loads [J]. Thin-Walled Structures，2012，53：109-122．
[9] 章冠人，陈大年. 凝聚炸药起爆动力学[M]. 北京：国防工业出版社, 1991.
ZHANG Guan-ren，CHEN Dan-nian. Agglomerate Explosive Initiation Physics [M]. Beijing: National Defense Industry Press，1991.
[10] Johnson G R，Cook W H． A constitutive model and data for metals subjected to large strains，high strain rates and high temperature [C] // Proceedings of 7th Symposium on Ballistics. Hegue，Netherlands：International Ballistics Committee，1983：541-547．
[11] 纪冲,龙源,刘影,等. 充液及内空圆柱壳在爆炸荷载下动力屈曲特性研究[J]. 振动与冲击,2014,33(02):76-80+88.
JI Chong，LONG Yuan，Ying Liu，et al．Research on Dynamic buckling of Liquid-filled and Hallow Thin-wall Cylindrical Shells subjected to Explosion Loading[J]. Journal of vibration and Shock，2014,33(02):76-80+88.
[12] 宋克健，龙源，纪冲，等. 薄壁方管结构在爆炸荷载作用下动力响应及破坏模式分析[J]. 振动与冲击，2016，(10)：133-138.
SONG Ke-jian，LONG Yuan，JI-Chong，et al. Dynamic responses and damage modes of thin-walled square tubes subjected to explosion loading [J]. Journal of vibration and Shock，2016，(10)：133-138.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(2825 KB)
