Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7889326 | Composites Part A: Applied Science and Manufacturing | 2018 | 22 Pages |
Abstract
Carbon based composites are used in thermal protection systems (TPS) for atmospheric re-entry. The electrical properties of this semiconductor material can be used for health monitoring, as electrical resistivity changes with damage, strain and temperature. In this work the electrical resistivity as a function of the material temperature is analysed, eliminating effects of thermal electricity, and the thermal coefficient of electrical resistance is determined. In the linear region, for material temperatures up to 523â¯K the thermal coefficient of electrical resistance is found to be Cα=-6.67·10-41/K and in the non-linear region it is Cβ=3.89·10-1. A sensor network is applied for local and time resolved monitoring of the 320â¯mmâ¯Ãâ¯120â¯mmâ¯Ãâ¯3â¯mm panel shaped samples. Since the TPS is used for atmospheric re-entry it needs to be characterised for a wide range of temperatures, in this case up to 2000â¯K. Therefore, experiments in an inductively heated test bench were conducted.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
T. Stäbler, H. Böhrk, H. Voggenreiter,