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dc.contributor.authorTang, Megan
dc.contributor.authorHooper, Joseph P.
dc.date05/07/2018
dc.date.accessioned2018-10-10T17:43:00Z
dc.date.available2018-10-10T17:43:00Z
dc.date.issued2018-05
dc.identifier.citationTang, Megan, and Joseph P. Hooper. "Impact fragmentation of a brittle metal compact." Journal of Applied Physics 123.17 (2018): 175901.
dc.identifier.otherDTIC Id118569
dc.identifier.urihttp://hdl.handle.net/10945/60235
dc.descriptionThe article of record as published may be found at https://doi.org/10.1063/1.5026711en_US
dc.description.abstractThe fragmentation behavior of a metal powder compact which is ductile in compression but brittle in tension is studied via impact experiments and analytical models. Consolidated metal compacts were prepared via cold-isostatic pressing of <10 lm zinc powder at 380 MPa followed by moderate annealing at 365 C. The resulting zinc material is ductile and strain-hardening in high-rate uniaxial compression like a traditional metal, but is elastic-brittle in tension with a fracture toughness com- parable to a ceramic. Cylindrical samples were launched up to 800 m/s in a gas gun into thin alumi- num perforation targets, subjecting the projectile to a complex multiaxial and time-dependent stress state that leads to catastrophic fracture. A soft-catch mechanism using low-density artificial snow was developed to recover the impact debris, and collected fragments were analyzed to deter- mine their size distribution down to 30 lm. Though brittle fracture occurs along original particle boundaries, no power-law fragmentation behavior was observed as is seen in other low-toughness materials. An analytical theory is developed to predict the characteristic fragment size accounting for both the sharp onset of fragmentation and the effect of increasing impact velocity.en_US
dc.description.sponsorshipOffice of Naval Research
dc.language.isoen_US
dc.publisherAIP Publishing
dc.titleImpact fragmentation of a brittle metal compacten_US
dc.typeArticleen_US
dc.contributor.departmentPhysics
dc.description.funderThe authors acknowledge support from the Office of Naval Research Grant No. N0001417WX00882


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