Accession Number : ADA336892

Title :   Fatigue Behavior of a Quasi-Isotropic Graphite/Epoxy Laminate Embedded with a Piezoelectric Sensor

Descriptive Note : Master's thesis

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH

Personal Author(s) : Coleman, Jon M.

PDF Url : ADA336892

Report Date : DEC 1997

Pagination or Media Count : 151

Abstract : This study primarily investigated the mechanical effects of embedding piezoelectric sensors on the tensile and fatigue strength of a quasi-isotropic, carbon-epoxy laminate. A secondary focus was the investigation of the sensor degradation under tensile loading. A O\+/-45\90s laminate was fabricated from Hercules AS4/3501-6 pre-preg tape. Specimens were first tested monotonically to obtain an average ultimate tensile strength and to detail the progression of damage. The fatigue tests were tension-tension, R=0.1, 10 Hz, constant amplitude. Results indicated that the embedded piezoelectric sensors did not have a significant effect on the tensile strength of the laminate. Specimens with embedded sensors showed a more extensive decrease in stiffness, but a lesser degree of overall delamination due to edge effects. The embedded sensors functioned consistently at the manufacturer suggested operational range, but degraded rapidly thereafter.

Descriptors :   *FATIGUE(MECHANICS), *GRAPHITE EPOXY COMPOSITES, MECHANICAL PROPERTIES, TENSILE STRENGTH, DETECTORS, THESES, PIEZOELECTRIC MATERIALS, EMBEDDING, LOAD CONTROL.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE