The authors developed a new testing equipment for studying statically indeterminate fracture mechanics, i.e. to study the load history-dependency of plastic collapse. The equipment has two mutually perpendicular actuators. The horizontal actuator applies the axial force and the perpendicular one supplies the bending moment. When examining the effect of the load history on the plastic collapse, both actuators will maintain constant loads, until either the axial force or the bending load reach the theoretical collapse point. The actuators can also apply the load under the displacement control. The performance of the equipment was demonstrated by tests using single-edge notched specimens of SUS304 steel. The experimental result showed the load history-dependency of the plastic collapse in SUS304 single-edge notched member subjected to combined tension and bending.
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