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The observation of out-of-order discs has revealed that macroscopic cracks are found only in the radial direction extending from the inner to the outer radius but without passing through the whole radius length. Figure 3 presents an example of such a macroscopic crack with a length of 66 mm. The geometry of these cracks is generally strictly rectilinear. Occurrence of such cracks is not systematic, but if they occur, it is generally in a relatively early stage of service, such as one or two years compared to fifteen or more for same discs without cracks. Ò»µ©ÕâÖÖÁÑÎÆ²úÉúÁË£¬¾ÍÔõôÁË£¿ |
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