Abstract
Experimental and numerical investigations are carried out to determine how thin steel plates with pre-cut defects behave under blast loading. The defects considered in this study are represented by four square holes, symmetrically distributed around the centre of the target plates. The target plates were manufactured from two types of steel, i.e., a dual-phase medium strength steel and a high-strength martensitic steel. A shock tube facility was used to expose the plates to blast-like loading conditions. The experiments showed that both the blast resistance and the corresponding fracture mode changed with material properties. Numerical simulations were performed using the finite element code LS-DYNA, where the numerical results were found to be in good agreement with the experimental data in predicting the ductile fracture during the blast-structure interaction. The numerical simulations confirmed that significant work hardening will distribute the plasticity throughout the plate material during deformation, while limited work hardening will tend to localize the plasticity that results in earlier fracture.
Highlights
Research on blast-resistant design has historically mostly been focusing on military installations with thick-walled massive constructions [1]
In Refs. [7,8], it was observed that the Docol 600DL material experienced plastic deformations and crack initiation at the extremities of the holes for the 15 bar and 25 bar firing pressures, while the highest firing pressure of 35 bar resulted in complete fracture of the target plate with cracks along the diagonals
The present study investigates the influence of material properties on the blast performance of thin steel plates with pre-cut defects
Summary
Research on blast-resistant design has historically mostly been focusing on military installations with thick-walled massive constructions [1]. It is seen an increased interest in studies on thin-walled structures [2,3] These structures may contain geometrical defects (e.g. for design purposes or by fragments accelerated by a blast wave that impacts the target plate prior to the blast pressure). A high strength generally comes at the price of a reduction in ductility This motivates detailed studies on the influence of material properties on the blast performance of thin steel plates with pre-cut defects
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