Accession Number : ADA311693

Title :   Effects of Confinement on the Failure Mechanism in Cementitious Materials.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Rutland, Craig A.

PDF Url : ADA311693

Report Date : 16 DEC 1995

Pagination or Media Count : 315

Abstract : In this study it is shown that there is a change in the orientation of the failure plane of cementitious materials as confinement increases. It is also found that localized macroscopic behavior begins at or near the peak stress. The implications of this and the stress-strain data on the constitutive model are discussed. Necessary conditions for the prediction of a change in the angle of the failure plane with increasing confining pressure are developed. Conflicting data on the failure mechanism and specifically the orientation of the failure plane under triaxial compression provided the impetus for this study. An examination of several different methods of relieving friction between the platens and specimens is performed. A new type of specimen is developed using ceramic rods as aggregates to produce a two dimensional specimen. These specimens were tested in biaxial compression and are compared to standard specimens tested in triaxial compression. In addition a new method for determining strains from the damages in X-ray intensity is developed as part of this study. p7

Descriptors :   *MATERIALS, *CEMENTS, *CONFINEMENT(GENERAL), *FAILURE(MECHANICS), COMPRESSION, STRESS STRAIN RELATIONS, PEAK VALUES, DAMAGE, INTENSITY, THESES, SOLIDS, X RAYS, CERAMIC MATERIALS, RODS, BIAXIAL STRESSES, FRICTION, ADHESIVES, COHESION, TRIAXIAL STRESSES.

Subject Categories : Adhesives, Seals and Binders
      Ceramics, Refractories and Glass
      Miscellaneous Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE