A safety assessment method for high-density polyethylene material exposed to fire

Abstract

The invention belongs to the field of assessment of the performances of polymer materials, and concretely relates to a method for detecting and evaluating the performances of a high density polyethylene material after a fire. The method comprises the following steps: simulating the fire damage condition of the material to obtain the mechanical performance indexes of the material at a certain temperature at a certain time; and carrying out impact fracture analysis and microscopic examination (comprising infrared analysis and thermal analysis) on the fire damaged material, and judging that whether the mechanical performances of the material are obviously decreased or not, whether the material obviously oxidized or not and whether the material can be continuously used or not according to the examination result. The method comprehensively evaluates the performance change condition of the material after fire by combining the macroscopic mechanical performance change of the material with the microstructure change of the material and utilizing various modern analyzers. The method can accurately judges that whether the material is continuously used or not, can effectively reduce the replacement time and the replacement cost of high density polyethylene pipelines after fire hazard, and has practical reference values in the evaluation of the performances of other polymer materials after fire damages.

Description

technical field [0001] The invention belongs to the field of performance evaluation of polymer materials, in particular to a method for detecting and evaluating the performance of high-density polyethylene materials after being exposed to fire. Background technique [0002] With the implementation of the "West-to-East Gas Pipeline" strategy, gas pipelines have become more popular, and the gas pipeline network has developed rapidly in my country. Compared with the disadvantages of easy corrosion and short service time of metal pipes, high-density polyethylene pipes are considered to be the best for their high specific strength, low brittle temperature, good toughness, corrosion resistance, good insulation performance, and easy construction and installation. At present, it is an ideal gas pipe. [0003] As an energy transmission system, gas pipelines will directly affect people's daily life if there are quality problems, especially the leakage of gas will cause the danger of ...

AI Technical Summary

Problems solved by technology

However, due to the large range of fire burning, the polymer materials near the fire site will also be affected by thermal radiation.

After thermal radiation, the properties of polymer materials will change, the structural properties of high-density polyethylene will deteriorate, and the structural safety will decrease

After a fire, if all the pipelines around the fire site are also replaced, it will take a long time and cost a lot

[0004] At present, there is no systematic evaluation method for high-density polyethylene pipelines after fire damage, and it is impossible to replace or repair the pipelines according to the actual damage degree of the pipelines

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