Localized Impact Damage in Ceramics. Localized Impact Damage in Zinc Sulfide Crack Growth from Small Flaws in Larger Grains in Alumina

The following topics are covered in this report: (1) Localized impact damage in zinc sulfide, and (2) Crack growth from small flaws in larger grains in alumina. Zinc sulfide specimens were damaged by static and impact loading using glass spheres. The various types of cracks were identified and their...

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Bibliographic Details
Main Authors: Kirchner,H P, Larchuk,T J, Ragosta,J M
Format: Report
Language:English
Subjects:
Alumina
ALUMINATES
CERAMIC MATERIALS
Ceramics, Refractories and Glass
CRACK PROPAGATION
CRACKS
DAMAGE
DEFECTS(MATERIALS)
FRACTURE(MECHANICS)
GLASS
GRAIN GROWTH
GRAIN SIZE
Impact loads
IMPACT STRENGTH
IMPACT TESTS
LOADS(FORCES)
RATES
SINGLE CRYSTALS
WUNR032545
ZINC SULFIDES
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Summary:The following topics are covered in this report: (1) Localized impact damage in zinc sulfide, and (2) Crack growth from small flaws in larger grains in alumina. Zinc sulfide specimens were damaged by static and impact loading using glass spheres. The various types of cracks were identified and their sizes were measured. The maximum impact loads were estimated by several methods including an experimental method based on the assumption that static and impact loads are equal at equal indentation radii, a semi-empirical method previously developed on this program and a method suggested by Hutchings. Crack growth in alumina was simulated for the case of small flaws in larger surface crystals to determine the range of crystal sizes and loading rates in which single crystal fracture energies would be expected to control fracture. This should be expected only for large crystals and very high loading rates.