Multiaxial Behavior of ATJ-S Graphite

Abstract
A program to explore the behavior of ATJ-S graphite under multiaxial stress states is described. The program includes biaxial tests, off-axis uniaxial tests, and the development of a triaxial test capability. The first phase of the program is to conduct fracture tests on specimens of ATJ-S graphite under biaxial stress states at room temperature and 2000F at low strain rates. The biaxial tests consist of simultaneous axial loading and internal pressurization of hollow cylindrical specimens. The biaxial stress-states investigated include combinations of across-grain tension with with-grain tension, and across-grain compression with with-grain tension. The second phase is to conduct uniaxial tensile and compressive tests on ATJ-S specimens oriented at 0 degrees, 45 degrees, 70 degrees and 90 degrees to the across-grain axis of the material.

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