Issue 38

T. Inoue et alii, Frattura ed Integrità Strutturale, 38 (2016) 259-265; DOI: 10.3221/IGF-ESIS.38.35 261 Second, the advanced testing machine generates loads with mechanical structures each of which includes an actuator on one side and a reaction wall on the other side. These structures enable simplification of actuator control. Third, the advanced testing machine consists of a fixed frame which forms a 45 degree test axis and two movable frames which form 0 and 90 degree test axes. These structures enable prevention of a misalignment between the center of the specimen being shifted by loading to one direction and each loading axis. As a result, the prevention of misalignment can avoid a bending stress and a fracture of the test specimen by that bending stress. Fig. 2 and Tab. 1 show the advanced testing machine structures and specifications. Two frames, each of which has an actuator and a reaction wall, are installed on the fixed frame trough linear motion guides. An electro-hydraulic control system is installed in the testing machine. This testing machine was manufactured by Shimadzu Corporation. y x ACT Linear motion guide Test specimen Reaction wall Frame 0 deg. 45 deg. 90 deg. ACT Actuator (a) Whole configuration. Linear motion guide Reaction wall (90 deg.) Actuator (0 deg.) Actuator (90 deg.) Reaction wall (0 deg.) Actuator (45 deg.) Fixed flame (45 deg.) Reaction wall (45 deg.) Test specimen x (0 deg.) y (90 deg.) z A Movable frame (0 deg.) Movable frame (90 deg.) (b) Bird view. x (0 deg.) y (90 deg.) z Test specimen Chucking jig 0 deg. 45 deg. 90 deg. (c) Magnification view of A. Figure 2 : Planar tri-axial fatigue testing machine.