In-situ test instrument for micromechanics performances of materials under three-point and four-point bending action

The invention relates to an in-situ instrument for micromechanics performances of materials under three-point and four-point bending action, belonging to the technical field of micromechanics performance test of materials. The in-situ instrument belongs to an electro-mechanics integrated precise test instrument for micromechanics performances of materials. A direct-current servo motor is connected with a worm wheel and a worm; after slowing-down torque increasing is realized, a lead screw is driven by virtue of a secondary worm and gear transmission mechanism; after combination of the support of a foundation bed, a precise slide block is driven by the lead screw to move a bent head; and by combining the co-action of supporting units of a test sample, three-point bending and four-point bending experiments are realized. The in-situ test instrument for the micromechanics performances of the materials under three-point and four-point bending action has the advantages of a small size, a compact structure, light weight, good dynamic characteristic and low energy consumption. A sensor is directly arranged on the instrument foundation bed, so that the test precision is sufficiently guaranteed; meanwhile, the spacing between the bent heads at the two sides can be regulated, a three-point bending pressure head and a four-point bending pressure head are convenient to dismount, simple to exchange, and vertical structural arrangement is adopted, so that the condition that the instrument can be compatible with an objective table structure of commercial material property characterization instrument equipment is facilitated.