The planar spall experiments for OFHC were performed on the gas gun facility. 6 mm thickness OFHC sample with PMMA buffer was mounted in a stationary target holder and impacted by 3 mm thickness OFHC flyer carried within the head of the projectile body. The stress history at the interface between the OFHC sample and PMMA was measured by using manganin gage and the OFHC sample was recovered for post-test evolution. A void coalescence-based spall model proposed by Chen et al was used to simulate these experiments numerically. The computed results were compared with the stress recorded by manganin gage and the observed spall plane in recovered samples. The planar spall experiments for OFHC performed by Curran et al were simulated numerically by using the void coalescence-based spall model.