High strain rate fracture behaviour of fused silica

Ruggiero, Andrew; Iannitti, Gianluca; Testa, Gabriel; Limido, Jérôme; Lacome, Jean-Luc; Olovsson, Lars; Ferraro, Mario; Bonora, Nicola

doi:10.1088/1742-6596/500/18/182036

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…The test involves the impact of a flat‐nosed cylindrical projectile on a hard target, usually referred to as “anvil,” at normal incidence. Today, the test is used to validate constitutive models and to probe material resistance to impact loading 13–15 . At the impact, the section in contact with the anvil expands radially while the rear part of the cylinder pushes axially and shortens.…”

Section: Methodsmentioning

confidence: 99%

High‐rate characterization of additively manufactured Ti‐6Al‐4V using Taylor cylinder impact test: Experiments

Iannitti

Bonora

Testa

et al. 2020

Mat Design & Process Comms

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Fracture behavior of additively manufactured (AM) Ti‐6Al‐4V has been investigated under quasistatic and impact loading. Taylor cylinder impact tests, on material printed along different directions, have been performed at various velocity to determine high‐rate material deformation and impact velocity for damage initiation. Test results revealed that, although the AM material under quasistatic loading condition shows better characteristics than the corresponding wrought material grade, under impact condition, fracture in AM material occurred at an impact velocity almost half of that of wrought grade and at a strain 10 time less of the quasistatic uniaxial fracture strain. Microscopy investigation seems to indicate that pre‐existing microvoids produced by the AM process promote shear band development under impact loading causing fracture at much lower strain.

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Section: Methodsmentioning

confidence: 99%

High‐rate characterization of additively manufactured Ti‐6Al‐4V using Taylor cylinder impact test: Experiments

Iannitti

Bonora

Testa

et al. 2020

Mat Design & Process Comms

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“…Inelastic dilatation is interpreted as crushing that gradually reduces the shear resistance of the material. A brittle fracture criterion is used on the tensile side (see [11] for more details). …”

Section: Brittle Materials Modelmentioning

confidence: 99%

“…3.2). Parameters have been identified by Ruggiero et al [11] by an inverse calibration technique, on selected validation test configurations.…”

Section: Brittle Random Fragmentationmentioning

confidence: 99%

Modeling fragmentation with new high order finite element technology and node splitting

Olovsson

Limido²,

Lacome³

et al. 2015

EPJ Web of Conferences

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Abstract. The modeling of fragmentation has historically been linked to the weapons industry where the main goal is to optimize a bomb or to design effective blast shields. Numerical modeling of fragmentation from dynamic loading has traditionally been modeled by legacy finite element solvers that rely on element erosion to model material failure. However this method results in the removal of too much material. This is not realistic as retaining the mass of the structure is critical to modeling the event correctly. We propose a new approach implemented in the IMPETUS AFEA SOLVER R based on the following: New High Order Finite Elements that can easily deal with very large deformations; Stochastic distribution of initial damage that allows for a non homogeneous distribution of fragments; and a Node Splitting Algorithm that allows for material fracture without element erosion that is mesh independent. The approach is evaluated for various materials and scenarios: -Titanium ring electromagnetic compression; Hard steel Taylor bar impact, Fused silica Taylor bar impact, Steel cylinder explosion, The results obtained from the simulations are representative of the failure mechanisms observed experimentally. The main benefit of this approach is good energy conservation (no loss of mass) and numerical robustness even in complex situations.

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“…Iannitti et al [14,15] used the BDM to explain while ductile damage cannot occur in Taylor impact cylinder test of highly ductile metals (OFHC ad AL 1100-O) while, because of the different stress triaxiality state, it does occur in symmetric Taylor impact test (rod-on-rod) under equivalent velocity conditions. The BDM was also used to predict ductile tearing initiation and propagation in structural components such as deep water offshore pipeline welds [16][17][18][19]. Both Gurson and CDM based model formulations fail in predicting fracture under shear-controlled fracture condition.…”

Section: Introductionmentioning

confidence: 99%

Modification of the Bonora Damage Model for shear failure

Bonora

Testa

Ruggiero

et al. 2018

Frattura Ed Integrità Strutturale

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The Bonora damage model was extended to account for shearcontrolled damage. To this purpose, a new definition for the damage dissipation potential in which an explicit dependence on the third invariant of deviatoric stress was proposed. This expression leads to damage rate equation in which two contributions, the first for void nucleation and growth damage process the latter for shear fracture, can be recognized. For the J III controlled damage contribution, only two additional material parameters are necessary of easy experimental identification The extended model formulation was verified predicting the failure locus for AL 2024-T351 alloy. Finally, the failure locus for stress state combinations, where the minimum material ductility is expected, was determined.

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High strain rate fracture behaviour of fused silica

Cited by 10 publications

References 2 publications

High‐rate characterization of additively manufactured Ti‐6Al‐4V using Taylor cylinder impact test: Experiments

High‐rate characterization of additively manufactured Ti‐6Al‐4V using Taylor cylinder impact test: Experiments

Modeling fragmentation with new high order finite element technology and node splitting

Modification of the Bonora Damage Model for shear failure

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