Low-velocity impact behaviour and failure of stiffened steel plates

Abstract

The behaviour and failure of stiffened steel plates subjected to transverse loading by an indenter is studied in this paper. Low-velocity dynamic and quasi-static tests of stiffened plates with geometry adopted from a typical external deck area on an offshore platform were conducted. The results show that the quasi-static tests provide a good reference for impact loading situations, although they displayed a larger displacement at fracture. Finite element simulations of the steel panel tests were performed, using the elastic-viscoplastic J2 flow theory and a one-parameter fracture criterion. A relatively fine spatial discretization in the load application area was needed to capture accurately the onset of fracture. In order to locally refine the mesh, a method for automatic mesh refinement based on damage driven hadaptivity was implemented and evaluated against results obtained with fixed meshes of various element sizes.

Experimental and numerical penetration response of laser-welded stiffened panels

“…Therefore, it has been lately employed in different experimental-numerical studies, see e.g. [15,20,27]. However, compared with scaling framework introduced in previous section fracture strain adjustment for different element size is also based on single stress state.…”

“…Thereby, fracture strain used in simulations ignored the effect of stress state [17,18] or stress state effect was calibrated only based on uniaxial tensile test, e.g. [19,20]. Moreover, fracture strain sensitivity to element size (mesh size dependence) is also established based on the single stress state, although it is well established that mesh size dependence relates to the amount of strain localization prior to fracture and thus, depends on the stress state.…”

Review of experiments and calculation procedures for ship collision and grounding damage

“…The nose of bulbous bow is sometimes simplified as a hemisphere, and thus hemispherical indenters are also used to strike the stiffened panels in the experiments described in Refs. [9,12,14]. The stiffened panels deform plastically due to the membrane forces, and afterwards cracks are initiated at the necking circle or around lateral stiffening, see Fig.…”

“…The review comments on the advantages and disadvantages of various existing analytical methods, and recommends the most appropriate method to assess each collision scenario.  Membrane deformation and penetration of stiffened panels in side collision or stranding [6][7][8][9][10][11][12][13][14][15][16][17][18]  Compressed folding deformation and concertina tearing of web girders in side collision or stranding [19][20][21][22][23][24][25]  Penetration and crushing of double hulls in side collision or stranding [26][27][28][29][30][31][32][33][34][35][36][37][38][39]  Concertina tearing and cutting of stiffened panels in raking [25,[40][41][42][43][44][45][46][47]  Cutting of double hulls in raking [45,[48][49]…”

Experimental and numerical investigation of the responses of scaled tanker side double-hull structures laterally punched by conical and knife edge indenters

“…Quasi-static indentation tests are usually applied to investigate the indentation response and damage mode of ship structures. Compared with the low-velocity impact model test, quasi-static indentation testing is relatively easier to conduct and is considered to provide a good reference for low-velocity impact loading situations [5]. Therefore, a host of quasi-static indentation tests were performed to evaluate the deformation and fracture mode of ship structures.…”