Accession Number : ADA328245

Title :   Core Programs of High-Performance Composite Materials.

Descriptive Note : Interim rept. 15 Sep 95-14 Sep 96,

Corporate Author : DAYTON UNIV OH RESEARCH INST

Personal Author(s) : Crasto, A. ; Anderson, D. ; Esterline, R. ; Hill, C. ; Kim, R.

PDF Url : ADA328245

Report Date : JAN 1997

Pagination or Media Count : 158

Abstract : Evaluation of composites continued from the previous contract. New modifications, thermo-oxidative stability, and hygrothermal aging of AFR700 composites were studied. E-beam curing of composites was investigated. Bridge rehabilitation using carbon-epoxy composites was demonstrated. Modeling of damage in carbon-carbon fabric-based composites expanded to include 3-D stresses and model composites testing. Double lap-shear adhesives testing successfully compared predicted and actual test damage. Damage around a hole in a composite in tension was compared to a SVELT model; more detail was predicted by SVELT than FE. The CTE and cracking behavior of spacecraft cyanate ester composites were measured. Processing changes were identified and implemented in the cyanate ester composites. Neural network software has improved composites processing science; it is a more accurate predictor of resin cure than previous analytical models. Hardware and software were acquired to allow the expert control of the carbonization process. New sensors for carbonization investigated included FTIR and off-gas GC/MS. XRD studies of VGCF measured the degree of graphitization and other phases. A thermal conductivity instrument for composites was assembled for testing. The sintering test matrix for single-stage carbonization of pitch was completed. Several new ways of stabilizing pitch were investigated; polymerizable additives are the most promising. A new high-char yield resin was investigated as a carbon-carbon resin.

Descriptors :   *CARBON CARBON COMPOSITES, *THERMAL CONDUCTIVITY, NEURAL NETS, SPACECRAFT, CRACKING(FRACTURING), MORPHOLOGY, THERMAL STABILITY, CARBON FIBERS, MICROSCOPY, ELECTRON BEAMS, OXIDATION, MODEL TESTS, EXPERT SYSTEMS, COMPUTER AIDED MANUFACTURING, CURING, ESTERS, CYANATES, THERMAL CYCLING TESTS, ADHESIVES, GRAPHITE EPOXY COMPOSITES, SINTERING, THERMOSETTING PLASTICS, POLYIMIDE PLASTICS, INFRASTRUCTURE.

Subject Categories : Laminates and Composite Materials
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE