13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- Figure 2. GIGA QUAD YRB200 Figure 3. GIGA QUAD YRB200L Hourglass type of specimen as shown in Fig.4 is accepted as a formal test piece. Diameter of the critical section ‘φβ’ is designed as to give the reasonable stress level for the each material, while the diameter of the specimen grip ‘φγ’ may be decided by user freely. Collet chucks with different diameters such as 6mm, 8mm and 10mm are prepared in advance. Among them, the user can choose the most preferable collet chuck depending on the individual circumstance for the testing material. Figure 4. The shape and dimensions of the specimen 3. Support for environmental testing 3.1. High temperature environmental testing unit In order to perform the rotating bending fatigue test at high temperature, a special chamber and a Weight Counter Spring Collet nut Outer block Specimen Counter Collet nut Outer block Specimen Spring Weight
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