Accession Number : ADA313730

Title :   Dynamic Behavior of Brittle Materials.

Descriptive Note : Final rept. 1 May 92-30 Apr 96,

Corporate Author : CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS

Personal Author(s) : Ahrens, T. J. ; Knauss, W. G. ; Ravichandran, G.

PDF Url : ADA313730

Report Date : 30 JUN 1996

Pagination or Media Count : 62

Abstract : The objective of this work aimed at understanding the dynamic response of brittle materials under high rates of loading which are typical of high speed impact and shock generation. Three areas of investigation are covered, namely. (1) the dynamic strength of ceramics in uniaxial compression but under lateral confinement, (2) the propagation of stress waves through fractured but contiguous materials, and (3) shock-induced gas-producing reactions. The results of these studies indicate: The compression strength of ceramics under high speed impact is systematically and materially increased with progressive lateral constraint or lateral stressing. Wave propagation through fractured solids can be assessed through optical interferometry with high-speed photography. It is suggested that under shock conditions the Rayleigh-Taylor instability of interfacial mixing plays a dominant role in potential chemical processes that are shock induced.

Descriptors :   *DYNAMIC RESPONSE, *CERAMIC MATERIALS, *BRITTLENESS, OPTICAL PROPERTIES, IMPACT, INTERFACES, SOLIDS, STRENGTH(MECHANICS), FRACTURE(MECHANICS), INTERFEROMETRY, WAVE PROPAGATION, SHOCK, CHEMICAL REACTIONS, MIXING, STRESS WAVES, COMPRESSIVE PROPERTIES, HIGH SPEED PHOTOGRAPHY, RAYLEIGH TAYLOR INSTABILITY.

Subject Categories : Ceramics, Refractories and Glass
      Physical Chemistry
      Optics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE