Accession Number:

ADA460079

Title:

Computational Design of UHTC Materials for Hypersonic Applications (Preprint)

Descriptive Note:

Journal article

Corporate Author:

UES INC DAYTON OH

Report Date:

2006-01-01

Pagination or Media Count:

28.0

Abstract:

Ultra-High Temperature Ceramics UHTC are attractive candidates for use as leading edge components. This work explores the possibility of using computational methods to design a structure of higher strength and toughness within the constraint of 2D isotropy. The use of low-aspect ratio bone-shaped short fibers BSSF to improve fracture toughness and the use of composition tailoring to increase fiber strength were analyzed. Computational models show that significant improvements in fracture toughness can be realized with an aspect ratio of 15 if the fiber strengths can be raised to 1.5 GPa. The use of a single outer layer of lower thermal expansivity composition is predicted to increase strength by a factor of two, while multilayers of reasonable thickness result in strengthening by a factor of 3. It is predicted that these designs will offer significant leverage to increments from processing advances. An optimal design for a 2D fibrous monolith UHTC is suggested.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE