Ultra-high temperature (>2000(degrees)C) testing capability at Oak Ridge National Laboratory for carbon materials in air, inert gas and vacuum.

摘要

A new ultra-high temperature multiaxial (axial-torsional) test system concept is being developed for testing of carbon-carbon composite materials at temperatures up to 2200(degree)C in air, argon, and vacuum. The basic system concept incorporates computer control of temperature, pressure, and strain, displacement, or load versus time such that one can either test materials in the conventional monotonic or cyclic mode or ''fly a temperature-pressure-stress vs time profile'' to simulate a vehicle trajectory from ground level to space or vice versa. A unique spherical hydrostatic bearing concept is being developed which should permit the system to transmit both axial and torsional loadings with low induced bending moments. The basic test system has been assembled and shakedown tests of ATJ graphite specimens conducted at temperatures up to 1910(degree)C.