Fabrication and simulation of random and periodic macrostructures

R. McCuiston, E. Azriel, R. Sadangi, S. Danforth, R. Haber, D. Niesz, J. Molinari

Research output: Contribution to journalConference articlepeer-review

Abstract

Shock wave propagation during an impact event can nucleate and grow strength limiting defects in an armor material before the penetration process. By limiting shock wave propagation before the penetration process an improvement in armor performance may be realized. Recent studies on phononic band gap structures have shown it is possible to create stop bands in which wave propagation is forbidden. This study will address the feasibility of applying concepts of phononic band gap structures to shock wave propagation during an impact event. Macrostructures comprised of an Al 2O 3 matrix containing discrete WC-Co inclusions have been fabricated using tape casting and lamination. The millimeter scale WC-Co inclusions were placed in the Al 2O 3 matrix in either a random or periodic fashion. After binder removal and sintering, samples were characterized using optical and electron microscopy. Vickers indentation was used to determine the hardness of, as well as the bond quality between the two materials. Through transmission acoustic characterization evaluated low amplitude wave propagation. Results show that the Al 2O 3 / WC-Co system is feasible for the fabrication of macrostructures. A series of 2D finite element simulations were used to study high amplitude shock wave propagation. The effect of WC-Co inclusion size, volume percentage and structure were studied under various loading conditions. Simulations indicate that shock wave propagation in the macrostructures can be significantly altered when compared with either of the monolithic parent materials.

Original languageEnglish (US)
Pages (from-to)67-74
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume26
Issue number7
StatePublished - 2005
Event29th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: Jan 23 2005Jan 28 2005

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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