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聚乙烯蠕变行为的时间–老化温度等效性研究
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Abstract:
聚乙烯(PE)材料广泛应用于油气输送管道工程中，其力学行为具有显著的黏弹性，材料的黏弹性表明其内部存在特征松弛时间。此特征松弛时间往往受到温度、应力水平和老化等因素的影响，在探讨这一问题过程中出现了时间–温度等效原理、时间–温度–应力等效原理、时间–温度–老化时间等效原理等。借鉴这些等效思想，本文提出一种关于时间–老化温度等效的类似WLF方程的移位因子方程，并通过对不同老化温度下的PE试样进行一系列单轴拉伸试验，分析老化温度对PE黏弹性能的影响，构建出较为光滑的蠕变主曲线，表明PE材料存在时间–老化温度等效性。
Polyethylene (PE) material is widely used in oil and gas transmission pipeline engineering. Its me-chanical behavior exhibits significant viscoelasticity. The viscoelasticity of the material reveals the existence of material’s characteristic relaxation time. This characteristic relaxation time is usually affected by temperature, stress level and aging. In the process of discussing this problem, the time- temperature superposition principle, the time-temperature-stress superposition principle, the time- temperature-aging time superposition principle and some others were proposed. Based on these equivalence theories, a shift factor expression similar to WLF equation for time-aging temperature equivalence is proposed in this paper. Through a series of uniaxial tensile tests on PE samples aged at different temperatures, the influence of aging temperature on the viscoelastic properties of PE is analyzed. A smooth creep master curve is constructed, which shows the time-aging temperature equivalence of PE material.
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