Rock tensile damage testing system coupled with complex loading condition

A rock direct tensile test platform universally suitable for all material test machines, comprising a support frame, wherein a top of the support frame is fixed with a top plate (3), a bearing plate (5) is provided above the top plate (3), the bearing plate (5) is provided with a plurality of vertical force transferring rods (6), the force transferring rods (6) vertically extend through the top plate (3) and have a sliding fit with the top plate (3), lower ends of the force transferring rods (6) are provided with a tensile base (7), a top of the tensile base (7) is provided with a lower clamp holder (11), a bottom of the top plate (3) is provided with an upper clamp holder (13), and a clamp center of the upper clamp holder (13) coincides with a clamp center of the lower clamp holder (11),

• wherein the tensile base (7) is provided with a lower ball head (9) sliding fitted with the tensile base (7), and the lower clamp holder (11) is affixed to the lower ball head (9);
• and the top plate (3) is provided with an upper ball head (15) sliding fitted with the top plate (3), and the upper clamp holder (13) is affixed to the upper ball head (15).