TESTING METHOD FOR ACCELERATING EVALUATION OF SLOW CRACK GROWTH RESISTANCE OF POLYETHYLENE TUBE

摘要

A testing method for accelerating evaluation of slow crack growth resistance of a polyethylene tube, comprising the following two steps: preparing a testing sample, and performing high-temperature tensile testing; the testing sample is prepared by means of the procedures of compression molding, annealing, and stamping; a relationship curve of stress and strain is obtained by means of the high-temperature tensile testing on the testing sample; a slope of the testing sample is calculated within a strain hardening interval that the stress is suddenly increased on the relationship curve, then a strain hardening modulus is obtained for representing the slow crack growth resistance of a polyethylene material, and the larger the strain hardening modulus is, the better the slow crack growth resistance is. The testing method provided by the present invention is short in time consumption, low in material consumption, simple in testing sample preparation steps, and good in result reproducibility.