Core Programs of High-Performance Composite Materials
Abstract
Evaluation of composites and components continued from the previous contract. Materials used to RTM carbon-carbon preforms were evaluated. RDS data analysis software was written and modulated DSC evaluated as an analysis tool. Bridge rehabilitation successfully tested a new embedded rod technique. The measured CTE changes of composites were found to correlate with cracking densities. Damage during loading around holes in composites consisted of longitudinal cracks and delaminations. Transverse cracking was also studied including using a local shear deformation theory. A cruciform sample allowed the fiber/matrix interfacial normal stress to be measured on model composites. Problems with current lap shear tests and alternatives were examined. Three-dimensional micromechanics of textile weaves was continued. The processing science of composites continues examining the causes of shrinkage, sensors for resin infusion, 3D flow models, and hardware to test these models. Encapsulated oxidants as a new way of stabilizing pitch was investigated; the stabilization of bicomponent pitch was also examined. A method to prepreg carbon fibers with pitch powder was demonstrated. C-C heat-exchanger components were examined by microscopy. A class of high-char yield resins was investigated as a carbon-carbon resin but not found suitable. Graphitic foam structures were quantified as functions of both blowing gas and net-shape processing techniques.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1998
- Accession Number
- ADA366977
Entities
People
- A. Crasto
- Chloé E. Hill
- D. B. Anderson
- K. Han
- R. Esterline
Organizations
- University of Dayton