Four-point bending elastic parameter measuring method and four-point bending elastic parameter measuring system

The invention discloses a four-point bending elastic parameter measuring method and a four-point bending elastic parameter measuring system, belonging to the field of elastic parameter measurement, and solving the problems in the prior art. The four-point bending elastic parameter measuring method provided by the invention comprises the steps that an ideal uniaxial drawing (or compression) stress state is formed in a testing region by utilizing a four-point bending principle of a rectangular section beam, a determined theory relation exists among the stress value, a sample structure size and an applied load value, the strain value of a measuring point in axial and horizontal mutual orthogonal directions can be obtained by utilizing a strain paster measuring method, and further an elastic modulus and a poisson ratio of the sample can be calculated. The four-point bending elastic parameter measuring system comprises a testing loading device, a load data collecting unit, a strain data collecting unit and a data processing unit. The method provided by the invention has the advantages that the principle is simple, the test precision is high, the application range is wide, the realization is easy, the development cost is low, and the measuring system is miniaturized, desk type and manual operation equipment and has large popularizing capacity.