Accession Number:

ADA582581

Title:

Modeling of Ultrasonic and Terahertz Radiations in Defective Tiles for Condition Monitoring of Thermal Protection Systems

Descriptive Note:

Final rept. 1 Jun 2008-30 Nov 2012

Corporate Author:

ARIZONA UNIV TUCSON DEPT OF CIVIL ENGINEERING

Personal Author(s):

Report Date:

2013-04-01

Pagination or Media Count:

9.0

Abstract:

Conclusions from this research activity are summarized as 1 Cavity like mechanical defects and heat induced damages in porous foam tiles can be detected by electromagnetic THz radiation 2 Required frequency of the THz beam for sensing mechanical defects depends on the orientation of the defects. THz beam propagating parallel to a cylindrical cavity can detect the cavity at much lower frequency compared to a THz beam propagating perpendicular to the cavity axis 3 Electromagnetic properties of the foam material are altered significantly, well before its melting point. Therefore, heat induced damage can be easily detected by THz beam, well before the material is melted 4 Distributed point Source Method DPSM has been extended to model both electromagnetic and elastic wave interaction with defects. DPSM is found to be more efficient than FEM, especially for three-dimensional modeling 5 Some modifications on the DPSM technique have been suggested to improve the techniques accuracy and efficiency for solving both steady state and transient problems and 6 Some experimental observations have been justified through model predictions.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Test Facilities, Equipment and Methods
  • Acoustics
  • Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE