Quantitative analysis of inclusion distributions in hot pressed silicon carbide

Bakas, Michael; McCauley, James W.; Greenhut, Victor A.; Niesz, Dale E.; Haber, Richard; West, Bruce J.

doi:10.1016/j.ijimpeng.2012.06.010

Cited by 11 publications

(9 citation statements)

References 30 publications

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“…These observations are different than those by Wang and Ramesh, 16 and Bakas et al 24 who noted that the carbonaceous defects were primary sites for fracture initiation. Multiple Al/Fe phases are observed on the fracture surface (composition confirmed with EDS), suggesting that these may serve as fracture initiation sites in this hot-pressed silicon carbide material.…”

Section: Resultscontrasting

confidence: 81%

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On Compressive Brittle Fragmentation

et al. 2016

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Dynamic brittle fragmentation is typically described using analytical and computational approaches for tensile stress‐states. However, most fragmentation applications (e.g., impact, blast) involve very large initial compressive stresses and deformations. In this study, the compressive fragmentation of brittle materials is investigated experimentally across a range of materials: silicon carbide, boron carbide, spinel, basalt and a stony meteorite. Analysis of our experimental results suggests that there exists two different regimes in the fragment size distributions, based on two brittle fragmentation mechanisms. The first is a mechanism that produces larger fragments and is associated with the structural failure of the sample being tested. This mechanism is influenced by the loading conditions (rate, stress state) and sample geometry. The second fragmentation mechanism produces comparatively smaller fragments and arises from the coalescence of fractures initiating and coalescence between defects in regions of large stresses and contact forces (e.g., between two fractured surfaces from the larger fragments). A framework is developed for comparing experimental compressive fragmentation results with tensile fragmentation theories. The compressive experimental results are shown to be adequately described by the theories using the new framework.

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Section: Resultscontrasting

confidence: 81%

“…1. Carbonaceous inclusions have been found in the silicon carbides of Wang and Ramesh, 16 and Bakas et al, 24 indicating that our material is different. The optical micrograph image shows two types of microstructural features: (1) bright features, which have been identified as Al/Fe-rich phase in composition using EDS.…”

Section: Resultsmentioning

confidence: 67%

On Compressive Brittle Fragmentation

et al. 2016

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“…Swab et al observed changes in damage and fracture behavior with varying microstructure in silicon carbide. A separate study by Bakas et al on a hot‐pressed silicon carbide linked carbonaceous defects to failure during ballistic loading.…”

Section: Introductionmentioning

confidence: 99%

“…The design of the next generation of light‐weight and high‐strength advanced ceramics (e.g., hot‐pressed silicon carbide, AlN, titanium diboride) used in shielding applications requires an improved understanding of their unique dynamic behaviors. In particular, additional insight is needed on the failure and fragmentation mechanisms that exist for high‐rate loading conditions under well‐defined stress‐states (e.g., compression, confinement).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Microstructure and Confinement on the Compressive Fragmentation of an Advanced Ceramic

et al. 2014

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We investigate the rate-dependent compressive failure and fragmentation of a hot-pressed boron carbide, under both uniaxial and confined biaxial compression, using quantitative fragment analysis coupled with quantitative microstructural analysis. Two distinct fragmentation regimes are observed, one of which appears to be more sensitive to the microstructural length scales in the material, while the second is more sensitive to the structural character and boundary conditions of the compressed sample. The first regime, which we refer to as "microstructuredependent," appears to be associated with smaller fragments arising from the coalescence of fractures initiating from graphitic inclusions. This regime appears to become more dominant as the strain rate is increased and as the stress-state becomes more confined. The second regime generates larger fragments with the resulting fragment size distribution dependent on the specific structural mechanisms that are activated during macroscopic failure (e.g., buckling of local columns developed during the compression). The average fragment size in the latter regime appears to be reasonably predicted by current fragmentation models. This improved understanding of the effects of microstructure and confinement on fragmentation then provides new insights into prior ballistic studies involving boron carbide.

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“…A study [16] concluded that the ceramic microstructure is the main factor affecting ballistic performance. Accordingly, some studies have investigated the influence of inclusions, grain size and grain size variation as well as porosity in the ceramic matrix [17]. The microstructure is known to control the performance of ceramics during ballistic events through crack propagation and energy dissipation mechanisms [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotubes reinforcement on the mechanical properties of alumina and ZTA composites for ballistic application

2018

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Toughened and hardened alumina/carbon nanotubes and zirconia-toughened alumina (ZTA)/carbon nanotubes nanocomposites were developed by conventional ceramics route using pressureless sintering for the ballistic application. The multiwall carbon nanotubes (CNT) were functionalized with nitric acid oxidation reaction. Moreover, the surfactants sodium dodecyl sulphate and gum arabic were used to promote a homogeneous distribution of CNT in the ceramic matrix. Ceramic powders were prepared with pure alumina, alumina with the addition of 20 wt% of tetragonal zirconia/yttria, alumina/CNT and ZTA/CNT with the addition of 0.1 and 0.5 wt% of CNT. The morphology of nanocomposites was characterized by SEM-FEG. The mechanical properties of sintered samples were evaluated by flexural bending, Vickers microhardness and fracture toughness by SEVNB method. The addition of CNT in the ceramic and composite caused a general increase in densification, hardness, flexural strength and fracture toughness. ZTA composite with the addition of 0.1 wt% of CNT yielded the best results.

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Quantitative analysis of inclusion distributions in hot pressed silicon carbide

Cited by 11 publications

References 30 publications

On Compressive Brittle Fragmentation

On Compressive Brittle Fragmentation

The Effects of Microstructure and Confinement on the Compressive Fragmentation of an Advanced Ceramic

Effect of carbon nanotubes reinforcement on the mechanical properties of alumina and ZTA composites for ballistic application

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