Significance and Use This test method is primarily concerned
with the room temperature determination of the dynamic moduli of
elasticity and rigidity of slender rods or bars composed of
homogeneously distributed carbon or graphite particles. This
test method can be adapted for other materials that are elastic
in their initial stress-strain behavior, as defined in Test
Method E111. This basic test method can be modified to determine
elastic moduli behavior at temperatures from −75°C to +2500°C.
Thin graphite rods may be used to project the specimen
extremities into ambient temperature conditions to provide
resonant frequency detection by the use of transducers as
described in 6.1. 1.1 This test method covers the measurement of
the fundamental transverse, longitudinal, and torsional
frequencies of isotropic and anisotropic carbon and graphite
materials. These measured resonant frequencies are used to
calculate dynamic elastic moduli for any grain orientations. 1.2
The values stated in SI units are to be regarde