Fixed hard and brittle material surface stress loading device

The invention provides a fixed hard and brittle material surface stress loading device, which comprises a base structure, an upper pressing plate, a plurality of fastening bolts and a plurality of positioning pins, the top of the base structure is connected to the upper pressing plate through the fastening bolts, a test piece is used between the base structure and the upper pressing plate, and the plurality of positioning pins are arranged in the circumferential direction of the upper pressing plate. The fixed type hard and brittle material surface stress loading device is simple in structure, low in machining precision requirement, easy to produce and manufacture and low in cost; the theme structure of the clamp comprises the upper pressing plate and the base which form the mold, the structure is compact, the occupied space is small, and installation on a test platform is facilitated; deformation generated by the test piece is fixed accurately, and calibration work is facilitated; the test piece is in a pure