Abstract
Extensive research focus had been given to sacrificial sandwich panels to mitigate the effects of blast loads. This is due to their ability to distribute the load and absorb a significant portion of the blast energy. This paper studies the behavior of sacrificial sandwich mild steel panels of axially oriented octagonal tapered tubular cores subjected to near-field impulsive blast. The deformation behavior and several assessment parameters consisting of the peak force, stroke efficiency, energy absorption and core efficiency were investigated using validated finite element analysis. The developed deformation modes were mainly influenced by the top plate and tube thickness. Tubes of a 5° taper performed unfavorably, exhibiting increased peak force and lower energy absorption. Panels of top plate thickness of 4 mm exhibited higher stroke efficiency as compared to panels of lower thickness. The top plate and tube thickness significantly affected energy absorption. An increase of 73.5% in core efficiency was observed in thick-plate panels as compared to thin-plate ones.
Highlights
Impulsive loadings can be the result of accidental chemical reactions in chemical plants or an intended explosive detonation by terrorist attacks
Witteman [17] conducted a numerical study of the influence of polygonal cross-sections on the behavior of thin-walled tubes subjected to dynamic crushing in axial and oblique loadings
In this work we focused on localized loading to understand the effect of the proposed cores on stability
Summary
Impulsive loadings can be the result of accidental chemical reactions in chemical plants or an intended explosive detonation by terrorist attacks. Witteman [17] conducted a numerical study of the influence of polygonal cross-sections on the behavior of thin-walled tubes subjected to dynamic crushing in axial and oblique loadings. Tarlochan et al [18] conducted a similar study, where tubes of hexagonal and octagonal cross-sections had the highest energy absorption characteristics under axial and oblique loading, respectively. Reid and Reddy [23] studied the behavior of single and double-tapered metal tubes under axial and oblique quasi-static and dynamic loadings. Knowledge, research work had been carried out toresearch design and testtooctagonal tapered tubes in a panel system forno near-field blast loads. The buckling behavior and energy absorption performance of sacrificial sandwich panels with axially oriented octagonal tapered core tubes against near-field impulsive sandwich panels with axially oriented octagonal tapered core tubes against near-field impulsive loading were examined numerically. Were investigated to understand the behavior of the tested panels under blast load
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