Accession Number : ADA301937

Title :   Degradation of Graphite/Epoxy Composite Materials because of Load Induced Micromechanical Damage,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Grimes, G. C. ; Whitney, J. M.

PDF Url : ADA301937

Report Date : 1974

Pagination or Media Count : 22

Abstract : Coupons axially loaded beyond a critical stress level induce permanent micromechanical damage which results in subsequent loading degradation. This phenomena will be shown for static tension, static compression, and tensile fatigue types of loading. Such observations are accurate for larger structural elements where edge effects are not significant. Where they are, the results will be low (conservative) as size goes up. Therefore, relating observed damage to failture criteria and structural design is a reasonable and safe operation. Coupons axially loaded beyond a critical stress level induce permanent micromechanical damage which results in subsequent loading degradation. This phenomena will be shown for static tension, static compression, and tensile fatigue types of loading. Such observations are accurate for larger structural elements where edge effects are not significant. Where they are, the results will be low (conservative) as size goes up. Therefore, relating observed damage to failture criteria and structural design is a reasonable and safe operation. Coupons axially loaded beyond a critical stress level induce permanent micromechanical damage which results in subsequent loading degradation. This phenomena will be shown for static tension, static compression, and tensile fatigue types of loading. Such observations are accurate for larger structural elements where edge effects are not significant. Where they are, the results will be low (conservative) as size goes up. Therefore, relating observed damage to failture criteria and structural design is a reasonable and safe operation.

Descriptors :   *DEGRADATION, *DAMAGE ASSESSMENT, *MICROMECHANICS, *GRAPHITE EPOXY COMPOSITES, COMPRESSION, STRESSES, EDGES, TENSILE PROPERTIES, TENSION, SAFETY, FATIGUE, GRAPHITED MATERIALS, STATICS, AXIAL LOADS, STRUCTURAL COMPONENTS, STRUCTURAL ENGINEERING.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE