The invention relates to a biaxial stretching / compression mode
scanning electron microscope mechanical test device belonging to an electromechanical material performance test instrument. The biaxial stretching / compression mode
scanning electron microscope mechanical test device comprises a biaxial loading and transmission unit composed of a high-precision
direct current servo motor, a three-level large-reduction-ratio reducing mechanism, a small-lead
ball screw nut pair and a guide rail. With the adoption of the biaxial stretching / compression mode
scanning electron microscope mechanical test device, precise application of load can be realized in a quasi-
static mode at an extremely low velocity, a plurality of types of material performance test
modes containing a uniaxial stretching / compression mode, a biaxial
constant speed / variable speed synchronous stretching / compression mode, or a biaxial
constant speed / variable speed asynchronous stretching / compression mode, and the like can be started by synchronization precision acquisition of four paths of load / displacement signals and combining a closed-
loop control strategy taking a load, displacement or deformation
signal as a feedback source, and drive units, transmission units and detection units of each shaft are independent and are not interfered with one another. The biaxial stretching / compression mode scanning
electron microscope mechanical test device has a compact and exquisite structure and good compatibility with imaging instruments, such as a scanning
electron microscope.