Numerical simulation of the post-failure motion of steel plates subjected to blast loading
Introduction
Theoretical and experimental studies of structures subjected to blast loading have been widely reported in the literature, see for example, Nurick et al. [1], [2], [3], [4], Jones [5], [6], and Menkes and Opat [7]. These have dealt mainly with large inelastic deformations of the structure (mode I) and in some limited cases with the necking/tearing of the structure and the release of a blast fragment (mode II) [8]. Both Teeling-Smith and Nurick [1] and Nurick and Bryant [2] conducted experiments in which both mode I and mode II responses were observed. In addition, an attempt was made to experimentally quantify the post-failure motion of the blast fragment.
Post-failure motion of the blast fragment has hitherto been difficult to predict due to the fact that the material properties at the moment of tearing are difficult to quantify. The concept of including temperature effects into the material definitions has been reported by Johnson and Cook (JC) [9], subsequently by Zerilli and Armstrong [10], and also by Chung Kim Yuen and Nurick [11] and Langdon et al. [12].
This paper presents the simulated plate response and post-failure motion of the blast fragment, for uniform loaded plates and localised blast loading. For the localised loaded plates a JC material model is implemented, while for uniformly loaded plates the material model is described in Ref. [11], [12].
Section snippets
Experimental study
The experimental study is reported in detail in Ref. [1] and so only a short description is presented here. Steel plates of 100 mm diameter and 1.6 mm thickness were clamped between two support flanges. Sheet explosive was placed on a polystyrene pad in two concentric circular rings with a cross-leader and centrally detonated. This arrangement was assumed to produce uniform blast pressure loading on the plate.
The assembled experimental configuration is shown in Fig. 1. The impulse was determined
Experimental study
Nurick and Bryant [2], describe the experimental procedure followed in the testing of two idealised parallel separated plates. The two parallel separated plates were the opposing faces of a square structural tube member, as shown in Fig. 9, of cross-section dimensions of 100×100×2 mm and length of 300 mm. The upper and lower ends of the tube were rigidly attached to a ballistic pendulum, while the disk of PE4 explosive was centrally placed on top of a polystyrene pad. The mass of explosive was
Closing comments
The simulation results for the uniform loaded circular plates show close correlation to the published study of Teeling-Smith and Nurick [1], for both mode I and mode II responses. Also, there is favourable comparison between the presented simulation and experiments for the localised blast loading of parallel separated plates, as described in Nurick and Bryant [2]. In general, the simulated results for plate deflections are within a tolerance of one plate thickness, compared to the experimental
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2022, International Journal of Impact EngineeringCitation Excerpt :Numerical studies with various damage models specifically applied to structural steels under transverse blast loads are quite limited and salient ones have been highlighted in the succeeding paragraph. Balden and Nurick [16] presented numerical simulation of large deformations and post-failure motion of the blast fragment, for uniform as well as localised blast loading of circular plates in comparison to the experimental studies. Finite element code ABAQUS was used in [16] to simulate the structural response of the plate, while adopting the hydro-dynamic code AUTODYN to characterize the localised blast pressure time as well as its spatial history.