Plastic Deformation of Metal Tubes Subjected to Lateral Blast Loads

Abstract

When subjected to the dynamic load, the behavior of the structures is complex and makes it difficult to describe the process of the deformation. In the paper, an analytical model is presented to analyze the plastic deformation of the steel circular tubes. The aim of the research is to calculate the deflection and the deformation angle of the tubes. A series of assumptions are made to achieve the objective. During the research, we build a mathematical model for simply supported thin-walled metal tubes with finite length. At a specified distance above the tube, a TNT charge explodes and generates a plastic shock wave. The wave can be seen as uniformly distributed over the upper semicircle of the cross-section. The simplified Tresca yield domain can be used to describe the plastic flow of the circular tube. The yield domain together with the plastic flow law and other assumptions can finally lead to the solving of the deflection. In the end, tubes with different dimensions subjected to blast wave induced by the TNT charge are observed in experiments. Comparison shows that the numerical results agree well with experiment observations.

Study on the calculation method and structural dynamic response of buried pipeline subjected to external explosion load based on multiphase coupling

“…In order to verify the numerical calculation method based on multiphase coupling, the numerical simulation analysis of the pipeline explosion experiment in Ref. [ 23 ] is carried out, where the pipeline material in is Q235, the pipeline length is 100 cm, the outer diameter is 10 cm, and the shell thickness is 0.275 cm. The experimental device is shown in Fig.…”

Experimental Investigation on the Deformation and Fracture of Steel Square Tubes under Double‐Explosion Loadings

“…e charge was vertically installed above the square tube and aligned with a line passing through its centre point. e centre of the upper surface of the column charge was e TNT density is 1.63 g/cm 3 , and the detonation velocity is 6950 m/s.…”

“…e results show that the existence of water provides a "foundation" pressure for deformation resistance. Song et al [3] built a mathematical model to analyse the deflection and the deformation angle of the steel circular tubes subjected to lateral blast loads. e calculation results agree well with experiment observations when the deformation is relatively small.…”