Analysis of Hardness Indentation Size Effect (ISE) Curves in Ceramics: A New Approach to Determine Plasticity

Wilantewicz, Trevor E.; McCauley, James W.

doi:10.1002/9780470456286.ch21

Cited by 3 publications

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“…The value of H/E has also been compared to the radius of the deformation plastic zone created during an indentation event. Recently, Wilantewicz and McCauley proposed a new hardness‐based approach to quantify bulk plasticity in ceramic materials. Unlike previous approaches, where the amount of plasticity was determined at a single indentation load, this approach determines the bulk plasticity from hardness measurements taken over a range of loads.…”

Section: Introductionmentioning

confidence: 99%

Using Hardness Tests to Quantify Bulk Plasticity and Predict Transition Velocities in SiC Materials

Hilton

McCauley

Swab

et al. 2012

Int J Applied Ceramic Tech

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It has long been known that a relation exists between a material's hardness and its gross impact performance; however, the nature of this relationship has not been understood to a degree useful in materials development. Many studies have shown that harder ceramics tend to display better ballistic performance. In addition, some research has suggested that a material's potential for inelastic deformation (or its "quasi-plasticity"a bulk property) may also play an important role in its resistance to penetration. Methods of quantifying the bulk plasticity of a ceramic material are, however, extremely limited. The current study continues an investigation into a recently proposed technique to (1) quantify bulk quasi-plasticity in SiC materials, and (2) use the "plasticity" value along with a hardness value to predict the transition velocity of potential armor ceramics. The transition velocity values predicted by this approach generally show excellent agreement (within 5% in most cases) with experimentally determined velocities. In addition, the robustness of this predictive technique is demonstrated through the use of multiple operators and multiple hardness testing units. †

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Section: Introductionmentioning

confidence: 99%

Using Hardness Tests to Quantify Bulk Plasticity and Predict Transition Velocities in SiC Materials

Hilton

McCauley

Swab

et al. 2012

Int J Applied Ceramic Tech

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“…Wilantewicz et al . quantified plasticity in polycrystalline ceramics by analyzing the indentation size effect observed when performing Knoop and Vickers hardness testing across a range of applied loads . McCauley and Wilantewicz leveraged this result, developing an empirical equation capable of predicting transition velocity using parameters of a power law curve fit to load–hardness data that exhibited good accuracy for armor grade silicon carbide materials .…”

Section: Introductionmentioning

confidence: 99%

Determination of Uncertainty in Transition Velocity Estimates for Ceramic Materials

Portune¹,

Hilton²

2012

Int J Applied Ceramic Tech

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The uncertainty of transition velocity estimates made for five armor ceramic materials was quantified by applying Bayesian hypothesis testing to the McCauley Wilantewicz method. Likelihood functions of the ceramic plasticity parameter and estimated transition velocity for each material were determined through analysis of load-hardness probability spaces. Parameters of these functions were analyzed to quantify variability in expected material performance. The applied statistical methodology enabled formation of probability of penetration curves that indicated how the certainty of interface defeat varied as a function of impact velocity. Qualitative and quantitative analysis of results increases the utility of the McCauley Wilantewicz method as a screening tool for ceramic materials by providing additional information regarding the variability of expected material performance. Information revealed by this statistical approach could potentially be harnessed to drive future material development by indicating microstructural states more likely to result in desirable material behavior.

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Quantifying Bulk Plasticity and Predicting Transition Velocities for Armor Ceramics Using Hardness Indentation Tests

Hilton¹,

McCauley²,

Swab³

et al. 2012

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Analysis of Hardness Indentation Size Effect (ISE) Curves in Ceramics: A New Approach to Determine Plasticity

Cited by 3 publications

References 0 publications

Using Hardness Tests to Quantify Bulk Plasticity and Predict Transition Velocities in SiC Materials

Using Hardness Tests to Quantify Bulk Plasticity and Predict Transition Velocities in SiC Materials

Determination of Uncertainty in Transition Velocity Estimates for Ceramic Materials

Quantifying Bulk Plasticity and Predicting Transition Velocities for Armor Ceramics Using Hardness Indentation Tests

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