Method and device for testing under-pressure maintenance and first-aid repair recovery performance of polyethylene pipeline

The invention provides a method and device for testing the recovery performance of maintenance and repair under pressure of a polyethylene pipeline, and the method comprises the steps: cutting a polyethylene pipe, obtaining a plurality of pipe section samples, processing the pipe section samples, and then carrying out an observation test, a tensile test, a hydrostatic pressure test and a crack propagation test on the pipe section samples. And judging whether the pipe section sample meets the requirements of non-gas-stop under-pressure maintenance and first-aid repair construction or not. According to the method, comprehensive and accurate evaluation is carried out on the pipe subjected to under-pressure maintenance and first-aid repair and extrusion recovery, the performance change condition of the polyethylene pipe subjected to under-pressure maintenance and first-aid repair and extrusion recovery is comprehensively evaluated by combining the change conditions of the microstructure, the mechanical property,