Transition between interface defeat and penetration for tungsten projectiles and four silicon carbide materials

Lundberg, Patrik; Lundberg, Bengt

doi:10.1016/j.ijimpeng.2004.06.003

Cited by 64 publications

(48 citation statements)

References 5 publications

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“…Interface defeat in ceramic targets has been studied extensively [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and signifies that an impacting projectile is forced to flow radially outwards without significantly penetrating the ceramic material. The contact boundary between the projectile and the ceramic is usually the outer ceramic surface but can also be in between different layers or at an interior boundary, e.g., a crack surface, within the ceramic material itself.…”

Section: Introductionmentioning

confidence: 99%

Influence of Length Scale on the Transition From Interface Defeat to Penetration in Unconfined Ceramic Targets

Lundberg¹,

Renström²,

Andersson

2013

Journal of Applied Mechanics

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One observation from interface defeat experiments with thick ceramic targets is that confinement and prestress becomes less important if the test scale is reduced. A small unconfined target can show similar transition velocity as a large and heavily confined target. A possible explanation for this behavior is that the transition velocity depends on the formation and growth of macro cracks. Since the crack resistance increases with decreasing length scale, the extension of a crack in a small-scale target will need a stronger stress field, viz., a higher impact velocity, in order to propagate. An analytical model for the relation between projectile load, corresponding stress field, and the propagation of a cone-shaped crack under a state of interface defeat has been formulated. It is based on the assumption that the transition from interface defeat to penetration is controlled by the growth of the cone crack to a critical length. The model is compared to experimentally determined transition velocities for ceramic targets in different sizes, representing a linear scale factor of ten. The model shows that the projectile pressure at transition is proportional to one over the square root of the length scale. The experiments with small targets follow this relation as long as the projectile pressure at transition exceeds the bound of tensile failure of the ceramic. Eor larger targets, the transition will become independent of length scale and only depend on the tensile strength of the ceramic material.Both the experiments and the model indicate that scaling of interface defeat needs to be done with caution and that experimental data from one length scale needs to be examined carefully before extrapolating to another.

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Section: Introductionmentioning

confidence: 99%

Influence of Length Scale on the Transition From Interface Defeat to Penetration in Unconfined Ceramic Targets

Lundberg¹,

Renström²,

Andersson

2013

Journal of Applied Mechanics

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“…Recently, a number of new experimental and theoretical studies have provided compelling arguments that the dynamic yielding and failure of high performance ceramics directly relate to the variety of inelastic deformation mechanisms by dislocation plasticity and twinning [5,[12][13][14]. However, direct characterization of the ceramic plasticity is rather difficult since their brittle nature leads to fragmentation that may mix the plastic deformation with other inelastic behaviors, such as micro-cracking and stress-induced phase transitions [9,10,[12][13][14][15]. Post-mortem characterization of recovered fragments frequently gives rise to controversial conclusions, mainly because of the unknown and uncontrollable loading experience of individual ceramic debris produced by dynamic tests.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation characterization of deformation and failure of aluminum oxynitride

et al. 2011

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Fujita, T.; McCauley, J. W.; Singh, J. P.; and Chen, M. W., "Nanoindentation characterization of deformation and failure of aluminum oxynitride" (2011 Abstract A systematic study of the mechanical deformation and failure of transparent ceramic aluminum oxynitride (AlON) has been conducted using a depth-sensitive nanoindentation technique combined with transmission electron microscopy (TEM) and Raman spectroscopy. Although discrete displacement bursts appear in the load-depth profiles at high applied forces, a detectable high-pressure phase transition has not been found by means of micro-Raman spectroscopy and TEM. Instead, a high density of dissociated h1 1 0i dislocations can be observed underneath the nanoindenters, suggesting that extensive plastic deformation takes place in the brittle ceramic at high contact pressures. Moreover, nanoindentation-induced micro-cracks oriented along well-defined crystallographic planes can also be observed, consistent with the low fracture toughness of AlON evaluated by an indentation method using Laugier's equation.

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“…The phenomenon of interface defeat, and in particular, the transition velocity from dwell to penetration, is not well understood. Researchers have developed very complicated targets with lateral confinements, backings, and different types of cover plate systems and have attributed interface defeat to a large variety of geometric properties, confinement, and hypothesized mechanics 1–4 …”

Section: Introductionmentioning

confidence: 99%

Dwell and Interface Defeat on Borosilicate Glass

Anderson

Holmquist

Orphal

et al. 2010

Int J Applied Ceramic Tech

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We have conducted impact experiments using gold long rods into borosilicate glass and the measured the penetration velocity as a function of impact velocity. At sufficiently low‐impact velocities, the glass target resists penetration and there is dwell; dwell is observed to approximately 450 m/s for bare glass. If a copper buffer is placed over the glass to eliminate the impact shock, significant dwell can be seen at impact velocities as high as 890 m/s. These impact velocities correspond to Bernoulli stresses of approximately 2.0 and 7.6 GPa, respectively. The paper describes the experimental data, and summarizes the results and our findings.

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Transition between interface defeat and penetration for tungsten projectiles and four silicon carbide materials

Cited by 64 publications

References 5 publications

Influence of Length Scale on the Transition From Interface Defeat to Penetration in Unconfined Ceramic Targets

Influence of Length Scale on the Transition From Interface Defeat to Penetration in Unconfined Ceramic Targets

Nanoindentation characterization of deformation and failure of aluminum oxynitride

Dwell and Interface Defeat on Borosilicate Glass

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