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首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >INFLUENCE OF THERMAL RATCHETING ON THE CREEP AND MECHANICAL PROPERTIES OF HIGH DENSITY POLYETHYLENE (HDPE)
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INFLUENCE OF THERMAL RATCHETING ON THE CREEP AND MECHANICAL PROPERTIES OF HIGH DENSITY POLYETHYLENE (HDPE)

机译：热棘轮对高密度聚乙烯（HDPE）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 HDPE material. The thermal ratcheting phenomenon amplifies significantly the creep strain of HDPE in comparison to the steady creep strain under constant temperature. The magnitude of creep strain of HDPE increases by 8% after just 20 thermal cycles between 28 and 50°C. The creep modulus which is inversely proportional to the creep strain depletes further under thermal ratcheting. Both 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 increase in initial steady creep exposure time-period but still the magnitude cumulative damage 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 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 to thermal ratcheting strain after 1 day of creep and under similar test conditions.
机译：该研究的目的是描述热棘对HDPE材料的长期蠕变性能的结果。与恒温下稳定的蠕变应变相比，热棘轮现象显着扩增HDPE的蠕变菌株。在28至50℃之间仅20个热循环后，HDPE的蠕变菌株的大小增加了8％。在热棘轮下进一步与蠕变应变成反比的蠕变模量进一步成比例。两个属性随着热循环的数量而变化。 HDPE的热膨胀系数（CTE）随着施加的压缩负载而具有连续的热循环和热棘轮温度的变化。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，但仍然诱导的幅度累积损伤是值得注意的。当分别在稳定蠕变1和45天后进行热棘时，蠕变应变的生长幅度从8-2.4％下降。对于每个加热和冷却循环的材料厚度有一个值得注的变化，即使在蠕变45天后，与在蠕变后1天后的热棘菌菌株和类似的试验条件下，热棘轮应变值均下降80％。

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