13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- radiuses and rings. For example, the mark j iM is the point at the intersection between the radius iR and the ring or crown j C . Let us note that radial and tangential strains are defined at the middle point comprised between 1M and 2M . According to this remark, the radial strain is calculated at the point 1 2 2M corresponding to a point placed in the radius n°2 and between rings 1 and 2. Figure 4. Notification of radius and rings With the same way, the tangential strain is calculated at the point 2 2 3 M placed in the ring n°2 and between radiuses 2 and 3. Figures 5 presents radial strains along radius n°3. show strain evolution along intermediary radius. Figure 5. Radial strain along radius n°3 Experimental tangential strains are measured along crowns 1C to 5C . Firstly, results are presented in terms of tangential strain evolution versus time for points l i j M placed in the intersection of crown lC and the radius comprised between radius iR and j R . Figure 6 and 7 show strain evolution along intermediary radius.
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