Ballistic Damage of Alumina Ceramics ‐ Learning from Fragments

Wu, Houzheng; Ghosh, Santonu; Dancer, Claire E. J.; Todd, Richard I.

doi:10.1002/9781119040590.ch5

Cited by 4 publications

(6 citation statements)

References 20 publications

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“…4. This suggests that the manner of fragmentation is characteristic of the material rather than the test, which is supported by examples in the literature where it has been reported that an increase in fragment size (and decrease in number of fragments) is related to a decrease in ceramic toughness [3,10]. The total mass of fragments captured by the gel restraint is indicative of the effectiveness of the technique, and was estimated using the mass of fragments extracted from the rubble and corner regions and assuming that the same behaviour was seen in the other quadrants.…”

Section: Ballistic Testingsupporting

confidence: 62%

“…Researchers have adapted the test to restrain fragments by confining the armour system in a steel box [10,11], but this has had the effect of altering the stress wave patterns from those that would naturally occur and therefore changed the fragmentation behaviour [12]. Thus, this study had the dual aims of developing a better method to capture fragments and preserve information on the ballistic event, and then studying those fragments to better understand the mechanisms that resulted in their creation.…”

Section: Introductionmentioning

confidence: 99%

“…Valuable information on the energy dissipation mechanisms that occur during the ballistic event could be obtained from fractographic examination of fragments generated [ 9 , 10 ], but in a typical experiment the energy of the impact causes fragments to be scattered over a wide range and possibly damaged further post-creation. Researchers have adapted the test to restrain fragments by confining the armour system in a steel box [ 10 , 11 ], but this has had the effect of altering the stress wave patterns from those that would naturally occur and therefore changed the fragmentation behaviour [ 12 ]. Thus, this study had the dual aims of developing a better method to capture fragments and preserve information on the ballistic event, and then studying those fragments to better understand the mechanisms that resulted in their creation.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the ballistic event: methodology and initial observations

et al. 2016

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The purpose of the study is to accelerate the development of ceramic materials for armour applications by substantially increasing the information obtained from a high-energy projectile impact event. This has been achieved by modifying an existing test configuration to incorporate a block of ballistic gel, attached to the strike face of a ceramic armour system, to capture fragments generated during the ballistic event such that their final positions are maintained. Three different materials, representative of the major classes of ceramics for armour applications, alumina, silicon carbide, and boron carbide, have been tested using this system. Ring-on-ring biaxial disc testing has also been carried out on the same materials. Qualitative analysis of the fracture surfaces using scanning electron microscopy and surface roughness quantification, via stereo imaging, has shown that the fracture surfaces of biaxial fragments and ballistic fragments recovered from the edges of the tile are indistinguishable. Although the alumina and boron carbide fragments generated from areas closer to the point of impact were also similar, the silicon carbide fragments showed an increase in porosity with respect to the fragments from further away and from biaxial testing. This porosity was found to result from the loss of a boron-rich second phase, which was widespread elsewhere in the material, although the relevance of this to ballistic performance needs further investigation. The technique developed in this work will help facilitate such studies.

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Section: Ballistic Testingsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding the ballistic event: methodology and initial observations

et al. 2016

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“…Since Longy and Cagnoux's paper demonstrating that, along with the fragmentation, dislocations/twins are activated during high-velocity impacts [1], a handful of researchers have paid specific attention to the role that plastic deformation plays in the performance of armour ceramics under various high-impact loading conditions [1][2][3][4][5][6][7][8][9][10]. In these investigations, several methods, including gas gun tests [2], flyer plate impact tests [1,[3][4][5] and split Hopkinson pressure bar tests [6,7], were employed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the cost and time constraints, the resultant impacts from the aforementioned experimental techniques frequently lead to catastrophic failure of the tested specimen. This invariably means that postimpact characterisation requires some form of reconstructive fragment analysis [10], leading to difficulties in interpreting the data. As a result, to date, the analysis of the plastic deformation in armour ceramics has not been understood to a level whereby the conditions of such a physical process and its potential impact on the dynamic/ballistic contact damage resistance of ceramic structures can be clearly defined.…”

Section: Introductionmentioning

confidence: 99%