Accession Number : ADA303236

Title :   Passive Thermal Nondestructive Flaw Detection in Composites,

Corporate Author : DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS

Personal Author(s) : Charles, John A. ; Wilson, Dale W.

PDF Url : ADA303236

Report Date : AUG 1979

Pagination or Media Count : 85

Abstract : The use of passive thermal nondestructive testing for flaw detection in composite materials has been studied. Using implanted TFE and natural defects in fiberglass/epoxy and graphite/epoxy, techniques for generating and monitoring surface temperature distributions on composites were developed and refined. A radiant heat source was constructed to provide a uniform heat input to the back surface of the specimens while the temperature field on the front surface was visualized using liquid crystals. It was found that most internal defects can be found easily because of their effect on the surface temperature field.

Descriptors :   *THERMAL PROPERTIES, *DETECTION, *NONDESTRUCTIVE TESTING, *COMPOSITE MATERIALS, *PASSIVE SYSTEMS, INPUT, SOURCES, TEMPERATURE, FIBERGLASS, GRAPHITE, LIQUID CRYSTALS, SURFACES, DEFECTS(MATERIALS), INTERNAL, EPOXY COMPOUNDS, HEAT, SURFACE TEMPERATURE, FRONT ENDS AND SURFACES.

Subject Categories : Laminates and Composite Materials
      Physical Chemistry
      Crystallography
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE