Experimental and numerical studies on the failure modes of steel cabin structure subjected to internal blast loading

This article presents the results of experimental and analytical studies on the response of steel and aluminium square plates with different thicknesses subjected to blast loading. Based on the blast wave details and the scaling law for explosions, a method of determining the blast load is proposed in which ballistic pendulums do not need to be utilized for obtaining the blast wave impulses. The loads applied to the plates are assumed to be the quasi-exponential pressure pulses, which are the same as the explosion overpressures. The theoretical solutions are presented using a rigid, perfectly plastic idealization and are exact within the context of dynamic plasticity. The dynamic energy imparted to structures can cause material failure. The presented investigation considers such a failure for fully clamped plates subjected to a blast loading idealized as an initial velocity distributed uniformly throughout the area. The predicted deflections and general failure modes of the plates are presented and compared with experimental results. Moreover, a numerical simulation is carried out by modelling an FSI (fluid–solid interaction) problem. Results are compared with each other and a better agreement between numerical results with experimental ones is observed.

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Dynamic Response of Steel Box Girder under Internal Blast Loading

Advances in Civil Engineering ◽

10.1155/2018/9676298 ◽

2018 ◽

Vol 2018 ◽

pp. 1-12 ◽

Cited By ~ 1

Author(s):

Shujian Yao ◽

Nan Zhao ◽

Zhigang Jiang ◽

Duo Zhang ◽

Fangyun Lu

Keyword(s):

Shock Wave ◽

Dynamic Response ◽

Failure Modes ◽

Numerical Study ◽

Blast Loading ◽

Deformation Degree ◽

Box Girder ◽

Steel Box Girder ◽

Internal Shock ◽

Internal Blast Loading

This paper aims at investigating the dynamic response of the steel box girder under internal blast loads through experiments and numerical study. Two blast experiments of steel box models under internal explosion were conducted, and then, the numerical methods are introduced and validated. The dynamic response process and propagation of the internal shock wave of a steel box girder under internal blast loading were investigated. The results show that the propagation of the internal shock wave is very complicated. A multi-impact effect is observed since the shock waves are restricted by the box. In addition, the failure modes and the influence of blast position as well as explosive mass were discussed. The holistic failure mode is observed as local failure, and there are two failure modes for the steel box girder's components, large plastic deformation and rupture. The damage features are closely related to the explosive position, and the enhanced shock wave in the corner of the girder will cause severe damage. With the increasing TNT mass, the crack diameter and the deformation degree are all increased. The longitudinal stiffeners restrict the damage to develop in the transverse direction while increase the crack diameter along the stiffener direction.

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The scaling laws of cabin structures subjected to internal blast loading: experimental and numerical studies

Defence Technology ◽

10.1016/j.dt.2021.04.001 ◽

2021 ◽

Author(s):

Xian-ben Ren ◽

Zhi-xin Huang ◽

Yong-bo Jiang ◽

Zi-hao Chen ◽

Xiao-fei Cao ◽

...

Keyword(s):

Scaling Laws ◽

Blast Loading ◽

Numerical Studies ◽

Internal Blast Loading

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Failure Modes of Tapered Suction Caissons Under Vertical Pull-Out Loads

Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design ◽

10.1115/omae2007-29490 ◽

2007 ◽

Author(s):

Mahmood Nabipour ◽

Mostafa Zeinoddini ◽

Mahmood R. Abdi

Keyword(s):

Failure Modes ◽

Numerical Approach ◽

Local Failure ◽

Superior Performance ◽

Soil Plug ◽

Pull Out ◽

Modes Of Failure ◽

Numerical Studies ◽

Second Mode ◽

Suction Caissons

The pull-out performance of conventional upright suction caissons has been investigated by different researchers. However, no attention has been formerly paid to tapered suction caissons. Some numerical studies already conducted by the authors demonstrated that tapered caissons exhibit pull-out capacities well above than that from their corresponding upright caissons. This paper deals with different failure mechanisms of tapered suction caissons and discusses some reason for their superior performance. A numerical approach has been used and different combinations of caisson types/ soil categories have been examined. With tapered suction caissons two different modes of failure have been discerned. The first mode has been noticed to develop in weak clays and sands under drained conditions. This mode corresponds to a shear sliding failure in the soil plug along the caisson’s interior wall. Concurrently a soil wedge is formed in the soil body adjacent to the caisson. The second mode of failure has been observed in higher strength drained clays and undrained clays and sands. With this failure mode a local failure at the bottom of the soil plug has been noticed to happen. At the same time the failure is extended to the lower surfaces of a soil wedge outside of the caisson. The detached soil plug accompanies the caisson in its movement upward following the local failure.

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