The elastic moduli of pyrolytic graphite, a polycrystalline material exhibiting large elastic anisotropy, have been measured by the ultrasonic pulse-echo method. In units of 1011 dyn/cm2, they are c11 = 5.21, c12 = 1.88, c13 = 1.80, c33 = 2.58, and c44 = 0.15.
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Papadakis et al. (1963) studied this question.
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