Accession Number : AD0714258

Title :   A New Fatigue Damage Indicator.

Descriptive Note : Progress rept.,

Corporate Author : ILLINOIS INST OF TECH CHICAGO

Personal Author(s) : Dally,J. W. ; Panizza,G. A.

Report Date : 15 SEP 1970

Pagination or Media Count : 46

Abstract : The development of a new concept for fatigue damage sensors is presented. The concept is based on the accumulation of damage in a composite material consisting of a particle filled matrix. The composite material is designed to exhibit an electrical conductivity by properly dispersing a system of conducting particles in a matrix which serves as an insulator. A Single conductor of the composite material attached to the component is exposed to a cyclic strain. The resistance of the composite undergoes a permanent change as the composite itself is damaged during the cycling. This damage induced resistance change in the composite can be related to fatigue damage induced in the component by strain cycling. (Author)

Descriptors :   (*DETECTORS, MEASURING INSTRUMENTS), (*COMPOSITE MATERIALS, FATIGUE(MECHANICS)), STRESSES, STRAIN(MECHANICS), ELECTRICAL RESISTANCE, ELECTRICAL CONDUCTIVITY, MEASURING INSTRUMENTS, DAMAGE ASSESSMENT

Subject Categories : Test Facilities, Equipment and Methods
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE