Dwell, Interface Defeat, and Penetration of Long Rods Impacting Silicon Carbide

Anderson, Jared R.; Charles, E Behner; Thilo, Holmquist; Timothy, J Orphal; Dennis, L Wickert; Matthias,

doi:10.21236/ada637030

Cited by 5 publications

(10 citation statements)

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“…An example of dwell and interface defeat is presented in Fig. 11 2 . Here, a long gold projectile impacts a SiC target at 1484 m/s.…”

Section: Computed Results For Hertzian Indentation and Ballistic Impamentioning

confidence: 99%

“…11) and for the Hertzian indentation configuration discussed previously. The copper buffer is used to attenuate the impact shock, produce gradual loading onto the ceramic surface, and set up the conditions for dwell to occur 2 . The impact velocity of 1300 m/s was chosen because it is well below the transition velocity of approximately 1550 m/s 2 .…”

Section: Computed Results For Hertzian Indentation and Ballistic Impamentioning

confidence: 99%

“…The copper buffer is used to attenuate the impact shock, produce gradual loading onto the ceramic surface, and set up the conditions for dwell to occur 2 . The impact velocity of 1300 m/s was chosen because it is well below the transition velocity of approximately 1550 m/s 2 . For the Hertzian indentation configuration, a load of 52 N was chosen such that the peak axial stress would be similar to that produced from dwell at 1300 m/s.…”

Section: Computed Results For Hertzian Indentation and Ballistic Impamentioning

confidence: 99%

“…There is also a strong desire to use Hertzian indentation to rank the ability of a ceramic to produce interface defeat. Interface defeat occurs when there is no penetration into the ceramic and the projectile is defeated on the ceramic surface 2 . Historically, this phenomenon is determined from ballistic tests.…”

Section: Introductionmentioning

confidence: 99%

“…Interface defeat occurs when there is no penetration into the ceramic and the projectile is defeated on the ceramic surface. 2 Historically, this phenomenon is determined from ballistic tests. Ceramics are placed in specific target configurations, impacted by specific projectiles, and ranked by their ability to produce interface defeat.…”

Section: Introductionmentioning

confidence: 99%

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Using Hertzian Indentation to Understand the Strength and Ballistic Resistance of Silicon Carbide

Holmquist

Wereszczak

2010

Int J Applied Ceramic Tech

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This article presents an initial evaluation of the usefulness of spherical or Hertzian indentation for the determination and/or validation of constitutive models and for a potential link to ballistic resistance (interface defeat). Recent advancements in producing more confident elevated stress levels in Hertzian indentation make the usefulness of this test much more feasible. There are very few experimental techniques that can produce the high stresses, strains, and pressures produced in Hertzian indentation tests. Additionally, they are also relatively simple, repeatable, timely, and inexpensive. There is still the disadvantage that the stresses, strains, and pressures are not explicit outputs of the experiments requiring the constitutive response to be inferred by performing computations and comparing the computed force–deflection results to the experiment. Preliminary results indicate that Hertzian indentation can be used to help define the constitutive response but it is still uncertain if it can be used to rank a ceramic's ability to produce interface defeat.

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“…An example of dwell and interface defeat is presented in Fig. 11 2 . Here, a long gold projectile impacts a SiC target at 1484 m/s.…”

Section: Computed Results For Hertzian Indentation and Ballistic Impamentioning

confidence: 99%

Section: Computed Results For Hertzian Indentation and Ballistic Impamentioning

confidence: 99%

Section: Computed Results For Hertzian Indentation and Ballistic Impamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using Hertzian Indentation to Understand the Strength and Ballistic Resistance of Silicon Carbide

Holmquist

Wereszczak

2010

Int J Applied Ceramic Tech

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Brief Overview of Deformation Mechanisms During Projectile Impact on a Confined Ceramic

2021

Dynamic Response of Advanced Ceramics

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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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Dwell, Interface Defeat, and Penetration of Long Rods Impacting Silicon Carbide

Cited by 5 publications

References 0 publications

Using Hertzian Indentation to Understand the Strength and Ballistic Resistance of Silicon Carbide

Using Hertzian Indentation to Understand the Strength and Ballistic Resistance of Silicon Carbide

Brief Overview of Deformation Mechanisms During Projectile Impact on a Confined Ceramic

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

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