METHOD OF ASSESSING THE DUCTILE RUPTURE ABILITY OF THE POLYMER PIPE Russian patent published in 2018 - IPC G01M5/00 G01N3/28 

FIELD: fault detection.

SUBSTANCE: invention relates to methods for evaluating the state of a polymer pipe, namely methods for evaluating, i.e. determining the ductile rupture ability of a polymer pipe, including a polyethylene pipe for a gas pipeline. Essence: a specimen is made from a polymer pipe, its test is carried out and the ductile rupture ability of the pipe is determined by the test results. Test of the specimen consists in its stretching under a uniaxial load. When stretching, the strain of the specimen at the yield point and the deformation of the specimen at the natural multiplicity of the stretch are determined, the difference between these parameters ("deformation jump") is determined, and the presence of a deformation jump determines the ductile rupture ability of the pipe: in the presence of a deformation jump, the pipe is evaluated as being capable of ductile rupture, and in the absence of a deformation jump – as a pipe that lost the ductile rupture ability.

EFFECT: increase in the reliability of the evaluation of the ductile rupture ability of the polymer pipe, resulting in a reduced risk of accidents with long-term operation of the pipeline, as well as in expanding the arsenal of means of assessing the pipe state.

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