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Direct evaluation of crack propagation. The crack propagation was directly observed and the crack length measured. The crack grew, and then propagated to the right side in view. It is the first time to observe three-dimensionally the crack propagation. Figure 9 shows the cracks in various directions. It is noted that it was the same as the graphene growth direction. It indicates that the crack propagated from the heel to the head. The graph as seen in Figure 10 shows the crack length from the initial crack to the maximum crack. Based on the graph, the fracture is similar to brittle fracture under mixed mode condition. This experiment is really interesting for researchers to have a deep understanding about the crack growth mechanism. Compared to the previous experiments under uniaxial tensile condition, this experiment offered a better way to investigate the crack propagation mechanism, because the load is distributed on the three directions.
At the end of the experiment, it was found that the end mill was cracked 12 mm away from the starting point. It proved that the end mill can show a stable state, which has less crack growth and self-healing properties. As shown in Figure 2, the end mill has the edge length of 18 mm and the thickness of 5 mm. So the end mill has the ratio of the length to the thickness of 81.8. The edges were sharpen by the end mill. They can inhibit the crack growth. It is the phenomenon that a sharp edge can slow down the crack propagation. The end mill may have a great influence to the mechanical properties of the coating. It may be used to enhance the protective properties of coatings.
The breckage of material and detachment of coatings on sharp edge of end mill is inevitable. The restoring properties and chemical stability of the coating will be degraded. For the complicated structure of application field and requirement of industry, coating will not be applied on the edge of end mill. It will be very important to restore the coating of the end mill. d2c66b5586