The proposed degradation model is verified by experiments to determine the breakage behavior of inhomogeneous granules. The stressing contact points are configured by repeated stressing. The model represents contact point configuration and distributed mechanical properties within a single granule by fitting Monte-Carlo data. It is applied to fit the cumulative breakage probability with normal, random, and Weibull strength distributions. The drop weight test verifies the model by testing gamma-Al2O3 and Zeolite 4AK granules. A damage accumulation effect by repeated stressing is observed.