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首页> 外文期刊>Journal of engineering materials and technology >Influence of Thermal Ratcheting on the Creep and Mechanical Properties of High-Density Polyethylene
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Influence of Thermal Ratcheting on the Creep and Mechanical Properties of High-Density Polyethylene

机译：热棘轮对高密度聚乙烯蠕变和力学性能的影响

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摘要

The objective of this research is to describe the consequence of thermal ratcheting on the long-term creep property of the high-density polyethylene (HDPE) material. The thermal ratcheting phenomenon increases significantly the creep strain of HDPE. The magnitude of the creep strain of HDPE increases by 8% after just 20 thermal cycles between 28 and 50 degrees C. The creep modulus, which is inversely proportional to the creep strain, depletes further under thermal ratcheting. Both the properties change significantly with the number of thermal cycles. The coefficient of thermal expansion (CTE) of HDPE varies with the applied compressive load, with successive thermal cycles, and with the thermal ratcheting temperature. The impact of thermal ratcheting diminishes with an increase in initial steady creep exposure time period, but still the magnitude cumulative deformation induced is noteworthy. The magnitude of growth in creep strain drops from 8% to 2.4% when thermal ratcheting is performed after 1 and 45 days of steady creep, respectively. There is a notable change in the thickness of the material with each heating and cooling cycle even after 45 days of creep; however, the thermal ratcheting strain value drops by 80% in comparison with the thermal ratcheting strain after 1 day of creep and under similar test conditions.
机译：这项研究的目的是描述热棘轮作用对高密度聚乙烯（HDPE）材料的长期蠕变性能的影响。热棘轮现象显着增加了HDPE的蠕变应变。在28到50摄氏度之间的20个热循环后，HDPE的蠕变应变幅度增加了8％。与蠕变应变成反比的蠕变模量在热棘轮作用下进一步耗竭。两种性质均随热循环次数而显着变化。 HDPE的热膨胀系数（CTE）随所施加的压缩载荷，连续的热循环以及热棘轮温度而变化。热棘轮的影响随着初始稳定蠕变暴露时间周期的增加而减小，但仍引起了一定程度的累积变形。当分别在稳定蠕变1天和45天后执行热棘轮操作时，蠕变应变的增长幅度从8％下降至2.4％。即使经过45天的蠕变，材料的厚度也会随着每个加热和冷却循环而发生明显变化。但是，在经过1天的蠕变和在类似的测试条件下，热棘轮应变值与热棘轮应变相比下降了80％。

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