Resonant ultrasound spectroscopy measurement of the elastic constants of cyclotrimethylene trinitramine

We used a resonant ultrasound spectroscopy technique to measure the nine independent elastic constants of cyclotrimethylene trinitramine C3H6N6O6 also known by its code designation RDX. The measurements were made on a single crystal grown from acetone containing RDX in solution. The elastic constants in gigapascal units are C11=25.6, C22=21.3, C33=19.0, C23=6.4, C31=5.72, C12=8.67, C44=5.38, C55=4.27, and C66=7.27.