The Williamsburg is a thermodynamically complete equation of state for detonation products. Williamsburg parameters were obtained for nitromethane by fitting to the results of chemical equilibrium calculations. The resulting equation of state was evaluated by simulating crylinder tests with a hydrocode. Plane Chapman-Jouguet detonation and a partial form of the WBL model were used to programme the motion of the detonation wave. Using the Williamsburg, the expansion history of the cylinder wall was predicted with a similar accuracy as using the JWL.
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