Assessment of creep behavior of HDPE pipe using a combined small punch creep test and stepped isostress method

IF 2.9 3区化学 Q3 POLYMER SCIENCE

Iranian Polymer Journal Pub Date : 2026-04-03 DOI:10.1007/s13726-026-01639-7

Chunmei Bai, Sixiong Zeng, Huan Sheng Lai, Rong Lin, Jinquan Guo, Qifei Huang

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引用次数: 0

Abstract

High-density polyethylene (HDPE) pipes exhibit anisotropic creep behavior due to the extrusion manufacturing process. While axial creep behavior can be evaluated using conventional creep tests, assessing circumferential creep behavior is more challenging because of specimen preparation constraints. Conventional creep testing is also time-intensive. In this study, a small punch creep test (SPCT) was conducted at 34 °C in ambient air using miniature specimens extracted from the mid-wall of HDPE pipes in both axial and circumferential orientations. To accelerate testing, the stepped isostress method (SSM) was applied. This combined SPCT–SSM approach enabled efficient investigation of the anisotropic creep behavior of HDPE pipes. Master curves were constructed from the SPCT data using SSM methodology. The results showed that creep life in the axial direction was markedly longer than in the circumferential direction. The findings demonstrate that combining SPCT with SSM provides an effective accelerated creep testing method. Moreover, the results confirm that specimens extracted only in the axial direction are insufficient for accurate long-term creep life assessment of HDPE pipes.

Graphical abstract

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用小冲孔蠕变试验和阶梯等应力法评价HDPE管材的蠕变性能

高密度聚乙烯（HDPE）管材在挤压制造过程中表现出各向异性蠕变行为。虽然轴向蠕变行为可以用传统的蠕变试验来评估，但由于试样制备的限制，评估周向蠕变行为更具挑战性。传统的蠕变测试也很耗时。在本研究中，在34°C的环境空气中，使用从HDPE管中壁提取的轴向和周向微型试样进行了小冲击蠕变试验（SPCT）。为了加速测试，采用了阶梯等应力法（SSM）。这种组合式SPCT-SSM方法能够有效地研究HDPE管材的各向异性蠕变行为。利用SSM方法从SPCT数据构建主曲线。结果表明：轴向蠕变寿命明显长于周向蠕变寿命；结果表明，SPCT与SSM相结合提供了一种有效的加速蠕变试验方法。此外，研究结果证实，仅在轴向提取的试样不足以准确评估HDPE管的长期蠕变寿命。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.