Accession Number : ADA293549

Title :   Poisson's Ratio for Cubic Crystals.

Descriptive Note : Technical rept.,

Corporate Author : ARMY RESEARCH LAB FORT MONMOUTH NJ

Personal Author(s) : Ballato, Arthur

PDF Url : ADA293549

Report Date : MAR 1995

Pagination or Media Count : 14

Abstract : General expressions for Poisson's ratio are derived for cubic crystals; simplified forms are given for cases involving symmetry directions. Crystals of cubic symmetry include many of the binary semiconductor systems with the piezoelectric zincblende structure, such as GaAs and related alloys. These are extremely important for high technology applications such as cellular radio and microwave collision avoidance radar. All cubic classes have the same elastic matrix scheme, so for our purposes it is not necessary to distinguish between the cubic point groups. The cubic elastic matrix scheme is identical in form to that of isotropic substances; the difference is that for isotropic materials the shear coefficient (s44 or c44) is related to the two other independent coefficients, whereas in cubic crystals it is a third independent quantity. jg

Descriptors :   *CRYSTALS, *POISSON RATIO, SHEAR PROPERTIES, COMPOSITE MATERIALS, GALLIUM ARSENIDES, ELASTIC PROPERTIES, MICROWAVE EQUIPMENT, RADAR, SEMICONDUCTORS, ALLOYS, COEFFICIENTS, ISOTROPISM, SYMMETRY, PIEZOELECTRIC MATERIALS, COLLISION AVOIDANCE, BINARY COMPOUNDS.

Subject Categories : Crystallography
      Properties of Metals and Alloys
      Mechanics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE