Abstract
The dynamic response of thin, perforated aluminium plates subjected to blast loading was studied both experimentally and numerically. Two different blast intensities were used and the plates were pre-cut with four horizontal and vertical slits prior to testing. The applied AA6016-T4 plates had an exposed area of 0.3 m x 0.3 m and a thickness of 1.5 mm. Special focus was placed on the dynamic response and failure characteristics of the plates. Uniaxial tensile tests were conducted in three different directions to determine the material behaviour and material parameters were found by inverse modelling using the optimization tool LSOPT. Finally, numerical simulations were performed in the finite element code Abaqus/Explicit where the plates were uniformly loaded with time-dependent pressure histories from similar tests on massive plates. The material behaviour was assumed to follow the J2 flow theory of plasticity and an uncoupled damage model was used in combination with element erosion to predict material failure. The numerical results were in good agreement with the experimental observations and predicted both the dynamic response and the complete tearing of the centre part of the plates.
Highlights
Plates subjected to blast loading have been studied for several decades and the dynamic response is well documented
An important feature of the Cockcroft and Latham (CL) failure criterion is that it accounts for both the stress triaxiality σ∗ and the Lode parameter μσ in the expression for the major principal stress given as σ1
The boundary nodes were fixed against translations and rotations in an attempt to simulate the axial restraint introduced by the clamping frame
Summary
Plates subjected to blast loading have been studied for several decades and the dynamic response is well documented (see e.g. [1]). Ductile failure in blast-loaded plates without perforations typically results in complete tearing along the boundary [2]. This failure mode has been simulated with good accuracy in previous studies. By introducing pre-formed holes in the plate, studies have shown that cracks may initiate at and propagate from the perforations, resulting in a more complex failure pattern. Aune et al [3] conducted experiments on steel plates with four pre-formed holes subjected to blast loading. Li et al [4] conducted experiments on steel plates with circular, square and diamond shaped preformed holes to study the dynamic response. Rakvåg et al [5] conducted experiments on steel plates with pre-formed holes subjected to pressure. The boundary conditions of the plate were modelled in a simplified manner and the load was applied as a pressure load with the intention to investigate the performance of an uncoupled blast-load approach
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