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Publications
Liu, B., Dong, A., Villavicencio, R., Liu, K. and Guedes Soares, C. (2022), “Experimental and numerical study on the penetration of stiffened aluminium alloy plates punched by a hemi-cylindrical indenter”, Ships & Offshore Structures, Vol. 17(3), pp. 492-505.
The present paper continues the recent works reported by Liu et al. (2020) where quasi-static indentation experiments and finite element simulations were reported to investigate the plastic behaviour and failure of four stiffened aluminium-alloy plates punched at the mid-span by a rigid hemispherical indenter: one bare plate, one butt-welded plate, two plates with respectively one and two flat-bar stiffeners. Here specimens with the same geometry are investigated experimentally and numerically using a rigid hemi-cylindrical indenter to examine the effect of the indenter shape on the deformation and collapse modes. The experimental comparison shows the different structural deformation and failure mechanisms of welded aluminium alloy panels and evaluates the effect of the welding and the influence of the stiffeners on the structural responses. The experimentally obtained forcedisplacement responses and collapse modes show a good agreement with the simulations performed by the LS-DYNA finite element solver. The finite element analysis also discusses the importance of the modelling of welded joining details, the boundary conditions and the material degradation at welded heat-affected zones and at the same time illustrates the similarities and differences between impact analyses of aluminium and steel stiffened plates.
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