Modeling fracture in large scale shell structures

Woelke, Pawel; Abboud, Najib N.

doi:10.1016/j.jmps.2012.07.001

Cited by 32 publications

(18 citation statements)

References 34 publications

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“…(8) (Consider condition, = = ⇒ = dσ σdε n ε n ε /( ) / 1 ), fracture strain is directly calibrated using the existing tensile test data of dog-bone (DB) specimens. Therefore, a single shell element model (S4R in Abaqus library) with an edge length equal to gauge length of the DB specimen (70 mm) was created and loaded under uniaxial tension η = 1/3; the same approach has been employed in [11,15]. The FE model and corresponding results are shown in Fig.…”

Section: Two-factor Scaling or 2fs Criterionmentioning

confidence: 99%

“…Recent review by Calle and Alves [10] covering numerical material fracture modelling approaches in ship crash analysis highlights the high computational cost of the analysis and consequent restriction to large structural shell elements. While computationally efficient, the size of the large structural shell elements imposes restrictions on how the fracture initiation and propagation can be modelled in large structures [11]. When shell elements are used together with element erosion technique to represent fracture, the main challenge is to select the appropriate numerical fracture strain as it depends on the element size and stress state.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical penetration response of laser-welded stiffened panels

Körgesaar

Romanoff

Remes

et al. 2018

International Journal of Impact Engineering

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A B S T R A C TDuctile fracture in large structures is often resolved with non-linear finite element (FE) simulations employing structural shell elements which are larger than localization zone. This makes solution element size dependent and calibration of material parameters complex. Therefore, the paper explores the ability of numerical simulations to capture the penetration resistance of stiffened panels after determining steel material fracture ductility at different stress states. The numerical simulations are compared with experiments performed with rigidly fixed 1.2 m square panels penetrated with half-sphere indenter until fracture took place. Response of the panels was measured in terms of indentation force versus indenter displacement. In parallel, tensile tests were performed with four different flat specimens extracted from the face sheet of panels to characterize the material fracture ductility at different stress states. Panel simulations were performed with two fracture criteria: one calibrated based on the test data from dog-bone specimen and other calibrated based on the data from all tensile tests. To evaluate the fracture criteria in terms of their capacity to handle mesh size variations, mesh size was varied from fine to coarse. Results suggest that fracture criterion calibrated based on the range of stress states can handle mesh size variations more effectively as displacement to fracture showed considerably weaker mesh size dependence.

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Section: Two-factor Scaling or 2fs Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical penetration response of laser-welded stiffened panels

Körgesaar

Romanoff

Remes

et al. 2018

International Journal of Impact Engineering

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show abstract

“…Woelke et al (2013) developed a numerical model of largescale plate penetration tests with applications to ship grounding to evaluate the performance of two numerical methodologies for modeling ductile fracture in large-scale naval structures: a damage and a cohesive zone approaches. Woelke and Abboud (2012) developed a damage approach to represent, phenomenologically, micromechanical material changes that take place during the necking process. This approach uses a dilatational plasticity model which accounts for pressure-dependent volumetric damage growth through a scalar damage variable to induce material softening.…”

Section: Other Types Of Failure Criteriamentioning

confidence: 99%

“…Mesh regularization for aluminum Al 6061 T6 to reduce the mesh dependence in the damage approach is performed using a single shell element model with different sizes under uniaxial tension model(Woelke and Abboud, 2012).…”

mentioning

confidence: 99%

A review-analysis on material failure modeling in ship collision

Calle

Alves

2015

Ocean Engineering

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“…In each approach, the sequence of failure processes is subsumed within either the cohesive zone or the calibrated critical strain. Another approach [24][25][26][27][28]30] employs special shell elements allowing for damage and softening in a phenomenological way to generate the effective non-linear response of the structural components. A recent study by the present authors [29] compared the use of these special elements in plate tearing simulations with an approach based on a cohesive zone.…”

Section: Introductionmentioning

confidence: 99%