Accession Number:

ADA162508

Title:

Radiant-Energy Penetration Effect in the Thermal-Diffusivity Flash Technique for Layered and Porous Polymers,

Descriptive Note:

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA MATERIALS SCIENCES LAB

Personal Author(s):

Report Date:

1985-12-02

Pagination or Media Count:

37.0

Abstract:

Thermal insulation characterization of polymers and other materials is an important requirement for present and future aerospace missions, as well as for the home construction industry. Some dispersed composites and layered samples have been successfully characterized by the thermal-diffusivity flash technique, while the interpretation of these and other experiments for systems remains problematical. One refinement for layered-sample data reduction is investigated here. An exponentially decaying spatial penetration of radiant energy into the sample is accounted for. Under the conditions chosen for numerical evaluation and 18 reduction in the backface rise time, t12, is predicted for a case in which on 5 as much radiant energy is deposited on the midplane as on the front surface. It is experimental methods of estimating the penetration depth of the radiant energy for particular samples. Keywords Laplace transform Heat conduction problem Equations and Slabs. Author

Subject Categories:

  • Laminates and Composite Materials
  • Plastics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE