Fig. 7
From: A three-phase contact-breakage model for brittle spherical particles with conical nucleus formation

Diagram of normal force Fn and displacement s: predicted curve based on the CB model, Hertz model and Hiramatsu–Oka model and a set of measured data from the test. The circles are the boundary point between the local compaction phase and the elastic deformation phase, while the triangles indicate the occurrence of integral crushing. The dotted lines represent post-peak curves that are impossible to predict theoretically.