Accession Number : ADA256742


Title :   The Characterization of Boron/Aluminum Composite as an Orthotropic Elastic-Plastic Material


Descriptive Note : Interim rept. Jun 1982-Jun 1985


Corporate Author : PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS


Personal Author(s) : Sun, C T ; Doyle, J F ; Kenaga, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256742.pdf


Report Date : Jun 1985


Pagination or Media Count : 110


Abstract : Preliminary testing showed that Boron/aluminum displayed nearly linear elastic behavior up to failure when stressed in the fiber direction, but proved to be quite ductile in off-axis tests. Further, fatigue cracks could not be grown through the fibers but would always propagate parallel to the fibers irrespective of the initial orientation of the crack. An in-depth study of the room temperature tensile behavior of boron/aluminum composite was conducted. This behavior was accurately described using an orthotropic elastic-plastic constitutive model. An investigation into the crack-tip plastic zones in boron/aluminum was conducted both experimentally and analytically, and the results help explain the fatigue growth pattern.


Descriptors :   *COMPOSITE MATERIALS , *METAL MATRIX COMPOSITES , *ALUMINUM , *BORON , TEST AND EVALUATION , METALS , TEMPERATURE , CRACKS , ELASTIC PROPERTIES , REGIONS , PLASTICS , BEHAVIOR , FATIGUE , PATTERNS , ROOM TEMPERATURE , DEPTH , FAILURE , TENSILE PROPERTIES , FIBERS , MODELS , MATERIALS


Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE