The strength of the materials generally expresses the difficult degree of the crushed material, it is also known as the fragility of the material. The same crushing machine crushed the different materials under the same operating conditions; their production capacity is also different, which shows the fragile nature of the various materials. The fragile nature is related to the material strength, hardness, and density, uniformity of the structure, water content, viscosity, cracks, surface condition and shape. The relationship of material particle size with the strength is more closely, the smaller of particle size is, the less of its macro-and micro-cracks is than that of the large-grained one, so the strength is relatively high.
Strength indicates the resistance of material to external force, and therefore the more strength of the material is, the more difficult to be carried out breaking. But simple hardness of the material is not sure to difficult to disrupt, this is because the crushing process of the material is split off, so the strength of the material decides the difficulty degree of the broken material. If the hardness of the material is strong, it must be very difficult to grind, because the grinding process and crushing process is different, the grinding process is the process of the working body of grinding mill at the material surface continuously generates a large number of fine powder, and therefore determine the ease of grinding factor is the hardness of the material.
From the analysis to the compressive strength, toughness, and friability of the common rock, the greater of the hardness coefficient value is, the stronger of the rock is, the higher of the compressive strength is, and the friability is lower. Due to the uneven property of the natural materials, the intensity data of same material measured is various. In the actual work, we often determinate the hardness of the material, the hardness of the material to a certain extent reflects the difficulty degree of he broken material.
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