Study on degradation of mechanical performance of unplasticized poly（vinyl chloride） pipes at different ambient temperature

doi:10.19491/j.issn.1001-9278.2025.02.006

Abstract

Abstract:

The mechanical properties of unplasticized poly（vinyl chloride）（UPVC） pipe under high and low temperature environment were experimentally studied， and the constitutive models of UPVC pipe under different temperature were established. The relation between mechanical parameter and ambient temperature was proposed. A stress⁃strain curve model was established considering the influence of ambient temperature， and the proposed constitutive model was verified. The results indicated that the ambient temperature of UPVC pipe material has a great influence on the mechanical properties. Compared with the properties at normal temperature， the brittleness and yield strength of the material increased at low temperature， while the ductility and fracture strain decreased. At high temperature， the yield strength and fracture strain of the material decreased， while the ductility increased. Numerical analysis was carried out by using the programmed subroutine in terms of the ambient temperature variables. The numerical analysis results were in good agreement with the test ones.

Key words: unplasticized poly（vinyl chloride） pipe, ambient temperature, high and low temperature, constitutive relation, mechanical property

CLC Number:

TQ325.3

ZHANG Hui, TANG Zhanzhan, BAO Haixia, CHENG Xinyuan, CHEN Bin. Study on degradation of mechanical performance of unplasticized poly（vinyl chloride） pipes at different ambient temperature[J]. China Plastics, 2025, 39(2): 26-31.

Figures/Tables 8

Fig.1. Dimension size of the specimen （Unit： mm）

Fig.2. Stress⁃strain curves of the pipeline materials under different temperature

Fig.3. Effects of temperature on mechanical parameter of the pipeline materials

Fig.4. True stress⁃strain curves of the pipeline materials under different temperature

Fig.5. Stage divisions of true stress⁃strain curves of the pipeline material

Fig.6. Constitutive parameters and their fitting results

Fig.7. Flowchart of the subroutine USDFLD

Fig.8. Comparison between the numerical and experimental results

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