An experimental study concerning the relationships between specific fracture energy and specific surface area of fractured product in single particle crushing under slow rate of loading (0.3-1t/min) in a coarse size range is carried out by using various shaped specimens, i. e., spheres, disks, cylinders and cubes made of silicaglass, borosilicaglass, quartz, feldspar, lime stone, marble, gypsum and talc.
The fracture energy is calculated by the load-deformation curve and the specific surface area Sw [cm2/g] is calculated by the following equation
Sw=f/100ρΣMi/Xi...(1)
where f assumed to be 6 is the shape factor, ρ is the density and Wi is the weight percent of fractured product corresponding to the size Xi.
From the above experiment the following result is obtained that the specific fracture energy. E/M [kg-cm/g] is proPortional to the specific surface area of fractured product Sw [cm2/g] irrespective of kinds of samples, shape and size of specimen.
